Differential Patents (Class 116/268)
  • Patent number: 10378903
    Abstract: A method of identifying operational modes experienced by a user during a jump from an aircraft may comprise estimating a user altitude and a user descent rate, based on a set of navigation state data vectors. The method may further comprise determining that the user is ready to transition from a flight mode to a descent mode when the user altitude is above a jump altitude threshold, and a variation of the user altitude is below a predetermined altitude variation threshold. After determining that the user is ready to transition from the flight mode to the descent mode, the method further comprises determining that the user has transitioned from a flight mode to a descent mode when a user ground speed is below a ground speed threshold, and one or both of (i) a GNSS position error estimate, and (ii) the user descent rate estimate, indicates a jump signature.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: August 13, 2019
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Sabrina M. Mansur, Trevor C. Savage
  • Patent number: 10112139
    Abstract: An apparatus and method for monitoring reduced fluid flow through a filter. A filter, more particularly a fluid flow filter or an air filter when contaminated can suffer from a reduced fluid flow, which will often deform to match the fluid flow or more particularly in the case of an air filter—the air flow.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: October 30, 2018
    Assignee: THE BOEING COMPANY
    Inventor: David E. Hopple
  • Patent number: 9880065
    Abstract: Exemplary embodiments provide a packing leak detection system for leaks or discharge of a volatile material which discharge into the environment is subject to regulation. The system contains a compressor apparatus including a compressor cylinder, a compressor piston, a compressor piston rod positioned in a packing case, wherein a volatile material being compressed by the compressor apparatus leaks from the packing case. Also provided is a leak detector sized and configured to detect and monitor leaks of the volatile material from the packing case, as well as an apparatus for capturing and collecting volatile material which may leak from said leak detector. Methods of assessing leaks of a volatile material subject to environmental regulation are also provided.
    Type: Grant
    Filed: October 17, 2014
    Date of Patent: January 30, 2018
    Assignee: M-Squared Products & Services, Inc.
    Inventors: John P. Miguez, Jonathan D. Mann
  • Patent number: 9757532
    Abstract: Methods for detecting a patient disconnecting from a continuous positive airway pressure (CPAP) therapy device are disclosed. A cyclical pressure difference signal is derived based upon measurements from a patient interface pressure sensor and from a source pressure sensor. The pressure difference signal is integrated to generate a resultant integral signal for each respiratory cycle, which is comprised of at least one inspiratory phase and at least one expiratory phase as represented by the corresponding portions of the pressure difference signal. A pressure source of the CPAP therapy device is deactivated in response to a disconnect condition being evaluated from the integral signal. In one embodiment, the disconnect condition is the integral signal exceeding a predefined disconnect threshold. In other, it is a slope value corresponding to a rate of increase of the integral signal exceeding a predefined threshold for a predefined duration.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: September 12, 2017
    Assignee: Breathe Technologies, Inc.
    Inventors: Leonardo Alberto Baloa Welzien, Mark Pielemeier, Samir S. Ahmad
  • Patent number: 9695661
    Abstract: A particulate-accommodating fluid flow directing apparatus comprises a failure detection housing containing a flow directing insert, the housing serving as a pressure boundary; failure at any location along the insert being detectable by means associated with the housing. The insert can be manufactured of erosion resistant materials, including non-ductile materials such as ceramics. The insert is sealed to the housing at an inlet and a discharge forming a pressure chamber between the insert and housing. The pressure chamber can be maintained at a pad pressure complementary to the process pressure, the pad pressure being maintained and monitored for indication of insert failure.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: July 4, 2017
    Assignee: Specialized Desanders Inc.
    Inventor: Christopher A. Hemstock
  • Patent number: 9555350
    Abstract: A bypass valve having an adjustable flow resistance for a device through which a fluid medium flows. The valve includes a seat and a body which is biased closed, and which is movable in the opening direction by a fluid medium pressure difference between the inflow and the outflow side of the valve when the pressure difference exceeds a threshold. A bypass flow path connects the inflow side to the outflow side through the seat. The bypass valve includes a screen disposed in the bypass flow path. The valve body has two different open positions that depend on the fluid medium pressure difference. The entire cross-section of the bypass flow path is covered by the screen in a first valve body open position with a lower pressure difference, and a screen-free bypass flow path cross-section is exposed in a second valve body open position with a greater pressure difference.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: January 31, 2017
    Assignee: Hengst SE & Co. KG
    Inventor: Wilhelm Ardes
  • Patent number: 9549649
    Abstract: There is provided a robot cleaner including a main body, a suction unit that sucks air including foreign substances into the main body, a moving unit that moves the main body, a dust collecting unit that has a filter for filtering the foreign substances included in the air sucked by the suction unit and a dust collecting case that collects the foreign substances filtered by the filter, and a detection unit that detects whether or not the filter is attached to the main body.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: January 24, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Ohhyun Baek, Moohyun Ko, Inbo Shim
  • Patent number: 9316630
    Abstract: A contaminant detection system for use in a fluid distribution system includes a first detector assembly including an inlet housing and detector screen through which fluid in the fluid distribution system passes and a first sensor to detect a first type of contaminant caught in the detector screen; and a second detector assembly including a second sensor which activates when the inlet housing or detector screen is clogged to detect whether the fluid contains a second type of contaminant when the first sensor does not detect the first type of contaminant.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: April 19, 2016
    Assignee: SIKORSKY AIRCRAFT CORPORATION
    Inventors: Eric James Hodgkinson, David M. Lutian
  • Patent number: 9175805
    Abstract: A filtration device is disclosed. The device includes a filter inlet, a filter outlet, and a filter flow path from the filter inlet to the filter outlet. A filter in the filter flow path filters contaminants from lubricant flowing from a lubricant supply to a lubricant destination. A bypass flow path bypasses the filter in the event the filter becomes clogged. The bypass flow path has a bypass inlet in fluid communication with the filter flow path at a location upstream from the filter and a bypass outlet separate from the filter outlet and not in fluid communication with the filter outlet. The bypass outlet is normally closed to permit flow along the filter flow path and opens if the filter becomes clogged so that lubricant is directed along the bypass flow path and through the bypass outlet for disposal without going to the lubricant destination.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: November 3, 2015
    Assignee: Lincoln Industrial Corporation
    Inventors: Paul G. Conley, Canlong He, Craig J. Fraser
  • Publication number: 20150144053
    Abstract: A pressure differential indicator that eliminates the risk of providing a false positive due to fluid contamination. The invention has an electrically insulated barrier between the “hot” pin and the grounded housing without the need for a hermetic seal. The indicator can be manufactured at a greater efficiency and lower cost than is found with prior art pressure differential indicators. It has a piston that can be easily oriented to yield either a normally closed or normally open position. The indicator has at least one protrusion on a plastic overmold to engage the swage collar and resist axial rotation of the pin. A pressure seal interrupting the plastic overmold sections and exposing the underlying metal to allow for an O-ring seal with no potential leak path between plastic and metal. Finally, the pressure differential indicator has all moving components contained within a single cavity.
    Type: Application
    Filed: November 19, 2014
    Publication date: May 28, 2015
    Applicant: STANDEX INTERNATIONAL CORPORATION
    Inventor: Christopher Riccardella
  • Patent number: 8864890
    Abstract: A clog indicating device indicating clogging of a dust collecting filter in a dust collector is disclosed. The dust collector includes on an upper region of its casing an exhaust port opening upward, and a cover member is mounted interspatially above the exhaust port. A colored indicating float is so located as to be movable upward between the exhaust port and the cover member due to pressure of an air exhausted from the exhaust port. Clogging of a dust collecting filter is indicated according to a degree of exposure or a position in an up and down direction of the indicating float between the exhaust port and the cover member.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: October 21, 2014
    Assignee: Aoiseiko Co., Ltd.
    Inventors: Satoshi Sakuragi, Yoshifumi Kamakura
  • Publication number: 20140290559
    Abstract: A compressor in fluid communication with a filter is disclosed. A gauge is used with the filter and is configured to react to a pressure drop across the filter and indicate an increasing amount of contaminants captured by the filter. The gauge is provided with a dial having multiple scales thereon. A unitary indicator, such as a needle, is further provided with multiple indicating portions which can be used to indicate a property of the fluid, such as a differential pressure across the filter, and can simultaneously indicate a property, such as an economic cost associated with running the compressor with a filter having accumulated contaminants.
    Type: Application
    Filed: April 1, 2014
    Publication date: October 2, 2014
    Inventor: Janez Jakop
  • Publication number: 20140109823
    Abstract: A pressure indicator system is provided for use a gas storage container. The gas storage container has an interior that stores gas, and a housing having a cavity that opens to atmosphere and which communicates with the interior of the container. A piston or diaphragm communicates with a stem that extends through the cavity and into atmosphere, with the stem having a pressure indicator provided around an upper portion of the stem. A resilient element is retained in the cavity and normally biases the piston or diaphragm towards the interior of the container. The existence of pressure in the container opposes the normal bias of the resilient element to cause the stem and its pressure indicator to extend outside the cavity.
    Type: Application
    Filed: October 22, 2012
    Publication date: April 24, 2014
    Applicant: QUANTUM FUEL SYSTEMS TECHNOLOGIES WORLDWIDE, INC.
    Inventor: Mark Leavitt
  • Publication number: 20130198993
    Abstract: This invention relates to a dust indicator in a vacuum cleaner, which dust indicator (200) is arranged in a wall (102) at least partly defining a space of the vacuum cleaner that is set under negative pressure with respect to the outside of the wall during operation of the vacuum cleaner. The dust indicator comprises an air channel (211) having an air inlet (212) arranged at an outer side of the wall, and an air outlet (213) arranged at an inner side of the wall, such that an airflow is directed into the space during operation of the vacuum cleaner due to the negative pressure. The dust indicator further comprises a sensor (220) arranged for detecting dust by means of sending and/or receiving an electromagnetic signal which is transmitted through the space. The air channel is arranged such that the airflow prevents dust from sticking in an area of the path of the electromagnetic signal of the sensor.
    Type: Application
    Filed: June 28, 2011
    Publication date: August 8, 2013
    Applicant: AKTIEBOLAGET ELECTROLUX
    Inventors: Stefan Jonsson, Fredrik Sjöberg, Henrik Troberg
  • Patent number: 8034170
    Abstract: A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or more sensors and uses the sensor data to calculate a figure of merit related to the efficiency of the system. In one embodiment, the sensors include one or more of the following sensors: a suction line temperature sensor, a suction line pressure sensor, a suction line flow sensor, a hot gas line temperature sensor, a hot gas line pressure sensor, a hot gas line flow sensor, a liquid line temperature sensor, a liquid line pressure sensor, a liquid line flow sensor. In one embodiment, the sensors include one or more of an evaporator air temperature input sensor, an evaporator air temperature output sensor, an evaporator air flow sensor, an evaporator air humidity sensor, and a differential pressure sensor.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: October 11, 2011
    Inventor: Lawrence Kates
  • Patent number: 7887624
    Abstract: A filtration system for a gas powered concrete saw allows the user to inspect and/or determine how much dust is accumulated in the filter. In addition, manual filter cleaners are provided to allow the user to easily clean the filter without needing to open up the tool. In addition, the system is provided to deactivate the tool or notify the user if no filter is being utilized, or the filter is damaged. The system can also provide system lock out in the case of a missing or damaged filter. In addition, automatic methods are also provided to allow cleaning of the filter.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: February 15, 2011
    Assignee: Black & Decker Inc.
    Inventors: Erik Ekstrom, Craig A. Schell, William Kalbfleisch, Eric L. Bernstein
  • Patent number: 7753979
    Abstract: A filter assembly for use with compressor assemblies such as oxygen concentrators, ventilators and other breathing apparatus including a compartmented housing member having at least one inlet opening, an outlet opening, a filter member, and an adjustment member associated with the at least one outlet opening for varying the size of the at least one outlet opening for adjusting the amount of ambient air entering the filter assembly.
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: July 13, 2010
    Assignee: Home Health Medical Equipment, Inc.
    Inventor: Michael Andrew Amann
  • Patent number: 7494536
    Abstract: A bypass factor of an evaporator is used to indicate when an air filter of an HVAC is clogged. The bypass factor represents the amount of air that is bypassed without direct contact with the evaporator. As the air filter clogs, the bypass factor decreases. The bypass factor can also be used for early detection of clogging of the air filter. A first bypass factor is calculated by using the temperature measurements, and a second bypass factor is calculated by using the airflow rate of the air. The difference between the two bypass factors determines the error. An increase in the error indicates that the air filter is clogged. A coefficient of performance of the evaporator can also be calculated to detect if the air filter is clogged. A decrease in the coefficient of performance indicates that the air filter is clogged.
    Type: Grant
    Filed: January 4, 2005
    Date of Patent: February 24, 2009
    Assignee: Carrier Corporation
    Inventors: Pengju Kang, Mohsen Farzad, Alan Finn, Payman Sadegh
  • Patent number: 7470360
    Abstract: An indicator suitable for signaling restricted flow of a fluid through a filter mounted in a filter assembly includes a housing having an inner cavity. A diaphragm disposed within the housing separates the inner cavity into first and second chambers and deflects from a neutral position in response to applied pressures within the first and second chambers. A tab assembly opposite the diaphragm includes a spring-loaded flag moveable from a first position within the housing to a second position outside the housing. A pin operably coupled to the diaphragm holds the spring-loaded flag within the housing when the diaphragm is in the neutral position. In response to the diaphragm being deflected sufficiently from the neutral position to release the pin, the spring-loaded flag travels to the second position outside the housing, thereby indicating a restricted flow condition for the filter.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: December 30, 2008
    Assignee: Engineered Products Company
    Inventors: Charles Henry Berry, III, H Dianne Hammerand
  • Patent number: 7442292
    Abstract: A display provides an indication of the remaining useful life of a filter element by providing a visible level of fluid in the display corresponding to the remaining useful life. The fluid level is adjusted by a valve responsive to a pressure differential across the filter element. An increasing pressure differential produces an increased fluid level in the display. The display may be provided with markings indicating that a particular fluid level in the display corresponds to the need to change a filter cartridge containing the filter element.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: October 28, 2008
    Assignee: Stanadyne Corporation
    Inventors: Leon P. Janik, David Ferreira, Michael J. Williams
  • Patent number: 7387080
    Abstract: Disclosed is a pneumatic actuator movement indicator comprising a housing adapted to be connected in series between a pneumatic actuator and a source of pressurized fluid for the actuator, and an indicator located in, and having an equilibrium position in, the housing. The housing includes a first chamber for placing the housing in fluid communication with said actuator at a pressure P1, and a second chamber for placing the housing in fluid communication with said source of pressurized fluid at a pressure P2. The indicator is movable in the housing in response to a difference between P1 and P2. Movement of the pneumatic actuator produces a difference between P1 and P2; and in response to this difference, the indicator moves away from its equilibrium position, indicating the movement of the pneumatic actuator.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: June 17, 2008
    Assignee: Honeywell ASCA Inc.
    Inventor: Cristian S. Andronic
  • Patent number: 7360433
    Abstract: A fluid system pressure indicator is adapted for use in fluid systems having a filter element. The fluid system force indicator includes a housing partitioned to be exposed to the fluid system to provide transmission of a mechanical force between these partitioned environments to indicate the fluid pressure. This exterior shape change is such that it can be identified through tactile means not requiring visual identification.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: April 22, 2008
    Assignee: Stanadyne Corporation
    Inventors: Leon P. Janik, Stephen J. Vardion, Michael J. Williams
  • Patent number: 7303613
    Abstract: A pressure actuated electrical switch and indicator to indicate to a user that a filter vacuum cleaner requires cleaning or replacing. In a first embodiment, the pressure actuated electrical switch measures the pressure present between the filter media and the flow inducing device to determine whether a minimum absolute pressure threshold has been exceeded. The pressure actuated switch has a chamber with two electrical leads that are connected when the pressure in the vacuum cleaner raises above a predetermined level. A tube from the chamber to the vacuum cleaner housing draws a conductive part into contact with both leads. In additional embodiments, the pressure measure is the difference in air pressure above and below the filter media, or the difference in air pressure between the pressure in the air stream between the filter media and the flow inducing source, and the ambient air pressure.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: December 4, 2007
    Assignee: Euro-Pro Operating, LLC
    Inventor: Mark Rosenzweig
  • Patent number: 7285147
    Abstract: An air supply system for a clean room with a critical machine. An intake duct connects the exterior of the clean room to a make-up air unit, and is configured to transport external air into the make-up air unit. A first air duct connects the make-up air unit to an air conditioning cabinet including a first chemical filter, and is configured to transport the air flowing through the make-up air unit into the air conditioning cabinet. The first chemical filter removes airborne molecular contamination from the air transported into the air conditioning cabinet. A second air duct connects the air conditioning cabinet to the critical machine, and is configured to transport the air flowing through the first chemical filter of the air conditioning cabinet into the critical machine. An exhaust duct connects the critical machine to the exterior of the clean room, discharging waste gas produced in the critical machine.
    Type: Grant
    Filed: December 2, 2004
    Date of Patent: October 23, 2007
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventors: Po-Sung Kuo, Yung-Dar Chen, Jheng-Long Chou, Tung-Li Wu, Ming-Wen Huang
  • Patent number: 7244294
    Abstract: A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or more sensors and uses the sensor data to calculate a figure of merit related to the efficiency of the system. In one embodiment, the sensors include one or more of the following sensors: a suction line temperature sensor, a suction line pressure sensor, a suction line flow sensor, a hot gas line temperature sensor, a hot gas line pressure sensor, a hot gas line flow sensor, a liquid line temperature sensor, a liquid line pressure sensor, a liquid line flow sensor. In one embodiment, the sensors include one or more of an evaporator air temperature input sensor, an evaporator air temperature output sensor, an evaporator air flow sensor, an evaporator air humidity sensor, and a differential pressure sensor.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: July 17, 2007
    Inventor: Lawrence Kates
  • Patent number: 6955169
    Abstract: A device used with fluid canisters comprising a transparent body allowing the viewing of movement within the body having a minor and major cavity with a float indicator and float seat within the minor cavity. An inhaler top and bottom fits each end of the body forming an airtight chamber within the major and minor cavity above the float, the top having a seat to accept a canister and a nozzle aperture to accept a nozzle of the canister oriented to release fluid from the canister into the major cavity. An inlet through the minor cavity below the seat maintains pressure equal to pressure outside of the body within the minor cavity. Inhalation through a mouthpiece and one way valve reduces pressure within the major and minor cavity above the float drawing fluid through the one way valve creating a pressure difference across the float causing it to move.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: October 18, 2005
    Inventor: Khaja H. Khan
  • Patent number: 6817311
    Abstract: A pressure indicator and a corresponding method are disclosed, the pressure indicator comprising a display diaphragm, optionally transparent, and an indicator diaphragm coupled to and in fluid communication with the display diaphragm. In use, pressure is applied to the diaphragms, which may be amplified, whereby a change in the pressure applied causes relative movement between the diaphragms which is observable either on the outer surface of the display diaphragm or through the display diaphragm. The diaphragms may form a compartment preferably containing a liquid or gel. The indicator diaphragm may bear a recognizable configuration or pattern which can be colored and may comprise a symbol or graphic projecting from its surface. The configuration or pattern may comprise at least two components, each component corresponding to a different pressure. Also disclosed is an inflatable device, especially a football or a tire, comprising such a pressure indicator.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: November 16, 2004
    Assignee: Qinetiq Limited
    Inventors: Andrew S Treen, Chris R Lawrence, Martin Swan, John W Williams
  • Publication number: 20040187765
    Abstract: The present disclosure relates to a restriction indicator for an air cleaner system of an internal combustion engine. The restriction indicator includes a housing divided into first and second chambers by a diaphragm. A signal member is connected to the diaphragm. The signal member is moveable along an axis between a reset position and a first indicator position, and defines an axial opening within which a first retaining shoulder is located. A guide member is provided for guiding the signal member as the signal member is moved between the reset position and the first axial position. A retaining member is provided for retaining the signal member in the first indicator position. The retaining member extends within the axial opening of the signal member and includes at least two fingers that project radially outward from the axis. The fingers are configured to engage the first retaining shoulder to retain the signal member in the first indicator position.
    Type: Application
    Filed: August 12, 2003
    Publication date: September 30, 2004
    Applicant: DONALDSON COMPANY, INC.
    Inventors: William J. Krisko, William E. Couillard, Robert W. Diver, Wayne A. Kaul, Bernard A. Matthys, Larry R. Nepsund
  • Publication number: 20040182245
    Abstract: An air filter sensor kit and method of using the same for permitting a person to modify the filtering portion of a heating or cooling system that uses an air filter to enable the determination of when the air filter is dirty and needs changing. The air filter sensor kit includes an air filter sensor with a portion shaped for insertion through the air filter and a portion with an indicator for indicating the condition of the air filter. The kit includes an air filter sensor connecting and support member for connecting the air filter sensor to an air filter grill and for supporting the air filter sensor and a cutting tool for cutting a hole in an air filter grill to allow the passage of a portion of the air filter sensor connecting and support member to permit a portion of the air filter sensor to be inserted through the air filter. The air filter sensor kit also includes a cutting tool guide that is adjustable to conform to various configurations of air filter grills.
    Type: Application
    Filed: March 21, 2003
    Publication date: September 23, 2004
    Inventor: Barney F. Gorin
  • Patent number: 6758980
    Abstract: A liquid filter (10) housing an annular filter element (16) has an annular space or inlet chamber (24) between the filter element and the housing and viewable through the housing such that an operator can see the level of liquid in the inlet chamber as an indication of when to replace the filter element, the higher the level of liquid in the inlet chamber the greater the pressure drop across the filter element. A change interval plugging indicator (102), preferably part of the filter element, is provided by a gas trap and pressure responsive release mechanism (104) trapping gas in the upper section (23) of the inlet chamber until a designated release pressure is reached, corresponding to a desired terminal pressure, to prevent premature plugging indication otherwise indicated by rising liquid level in the inlet chamber. Accurate and reliable calibration is enabled by separating the filtration function and the plugging indication function.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: July 6, 2004
    Assignee: Fleetguard, Inc.
    Inventors: Ted Franklin Prater, Zemin Jiang, John Scheuren, John W. Clevenger, Jr., Barry M. Verdegan
  • Publication number: 20040112273
    Abstract: A detector for mounting to an air filter provides a signal if the filter is dirty. The detector has a housing mounted to the air filter. The housing has a cavity with a diaphragm. An upstream air inlet leads from an exterior of the housing to an upstream side of the diaphragm. A downstream air inlet leading from the exterior of the housing to a downstream side of the diaphragm. A stationary electrical contact is stationarily mounted in the cavity and normally spaced from the downstream side of the diaphragm. A movable electrical contact is mounted to the downstream side of the diaphragm for movement therewith. An electrical circuit is connected to the electrical contacts, so that movement of the diaphragm due to a sufficient difference in air pressure between the upstream and downstream air inlets causes the contacts to engage each other and causes the electrical circuit to provide a signal.
    Type: Application
    Filed: August 28, 2003
    Publication date: June 17, 2004
    Inventors: Aubrey R. Thoede, Steven R. Eatough, Jon S. Heaton, Craig N. Eatough
  • Patent number: 6641742
    Abstract: An annular space or inlet chamber 24 between the filter element 16 and housing of a liquid filter is viewable such that an operator can see the level of liquid in the inlet chamber as an indication of when to replace the filter element: the higher the liquid level, the greater the pressure drop across the filter element. A change interval plugging indicator includes a porous outer wrap 50 that traps gas in an upper section 23 of the inlet chamber below a designated release pressure and releases trapped gas upon attainment of the release pressure causing a rapid rise in liquid level within the housing and corresponding to a desired terminal pressure. The indicator prevents premature plugging indication otherwise indicated by a slowly rising liquid in the chamber. Accurate and reliable calibration is enabled by separating the filtering and indicating functions.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: November 4, 2003
    Assignee: Fleetguard, Inc.
    Inventors: Ted Franklin Prater, Zemin Jiang, John Scheuren, John W. Clevenger, Jr., Barry M. Verdegan
  • Patent number: 6604486
    Abstract: The present disclosure relates to a restriction indicator for an air cleaner system of an internal combustion engine. The restriction indicator includes a housing divided into first and second chambers by a diaphragm. A signal member is connected to the diaphragm. The signal member is moveable along an axis between a reset position and a first indicator position, and defines an axial opening within which a first retaining shoulder is located. A guide member is provided for guiding the signal member as the signal member is moved between the reset position and the first axial position. A retaining member is provided for retaining the signal member in the first indicator position. The retaining member extends within the axial opening of the signal member and includes at least two fingers that project radially outward from the axis. The fingers are configured to engage the first retaining shoulder to retain the signal member in the first indicator position.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: August 12, 2003
    Assignee: Donaldson Company, Inc.
    Inventors: William J. Krisko, William E. Couillard, Robert W. Diver, Wayne A. Kaul, Bernard A. Matthys, Larry R. Nepsund
  • Publication number: 20030056711
    Abstract: A pressure indication device including a housing with an opening in communication with a pressure vessel, a plunger moveable in the housing between a pressurized position and a non-pressurized position, a seal between the opening and the plunger, an indicator over the plunger and biased into a flag position, and a locking mechanism for holding the indicator in a set position until the plunger moves to the non-pressurized position whereupon the indicator returns to the flag position.
    Type: Application
    Filed: September 26, 2001
    Publication date: March 27, 2003
    Inventor: Brian R. Tranter
  • Patent number: 6383243
    Abstract: The invention provides an apparatus and method to monitor air filter restriction within an air cleaner system of a motor vehicle. The invention uses a quick connect couplig to allow fluid communication between a restriction gauge and the air cleaner housing and also provides a means of attaching the restriction gauge or a remote tubing connector to the air cleaner housing. The quick connect coupling is located within an axial bore, generally within a conduit in the housing. A portion of the filtered air is drawn from the air cleaner housing through the quick connect coupling and into the restriction gauge, where the pressure is measured and the amount of air filter restriction is gauged.
    Type: Grant
    Filed: August 30, 2000
    Date of Patent: May 7, 2002
    Assignee: International Truck and Engine Corp.
    Inventor: Lamar D. Yoder
  • Patent number: 6375833
    Abstract: A filter assembly for filtering pond or aquarium water includes a container (1,2) with an inlet chamber (15) having an upstream region (36) and a downstream outlet (13) leading to an outlet chamber (22). A filter (16) is positioned in the inlet chamber (15) between the upstream region (36) and the outlet (13). In use, progressive clogging of the filter causes the water pressure in the upstream region (36) to rise until it reaches a predetermined threshold when a normally-closed relief valve (28,29) opens to allow water to pass from the upstream region (36) to the outlet chamber (22) without passing through the filter (16). The valve has a coloured valve stem (28) providing a visual indication that the valve is open and that the filter is blocked and requires cleaning. In one embodiment, the outlet chamber (22) contains a source (19) of ultra-violet radiation to which the flow of water is exposed, regardless of whether the valve (28,29) is in the open or closed condition.
    Type: Grant
    Filed: June 6, 2000
    Date of Patent: April 23, 2002
    Assignee: Hozelock Limited
    Inventors: Kevin Ian Michael Marston, Andrew David Boddy
  • Patent number: 6327902
    Abstract: A low cost air filter restriction indicator gauge for use in conjunction with an internal combustion engine can be achieved by both simplifying individual part configuration and reducing overall part count. More specifically, a simplified design can be achieved by utilizing a one piece base cap which includes a locking extension and reset button integral therewith. By having this part injection moldable, it is easy to fabricate and lower in cost as a complex locking pin assembly can be eliminated. Further, the low cost device can be further enhanced by providing a two color visual indicator which displays one color when the device is in its reset position and a second color when the device is in its locked or set position.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: December 11, 2001
    Assignee: Engineered Products Company
    Inventors: Charles Henry Berry, III, Gregory Matthew Ferris
  • Patent number: 6307466
    Abstract: A two stage air filter restriction indicating device communicates with the supply of air passing from an air filter to the air intake of an engine. The amount of vacuum required by the engine to supply air is directly indicative of the amount of blockage in the air filtering system. The gauge or air filter restriction indicating device monitors this vacuum level and provides signals at an output indicating whether a predetermined vacuum level has been achieved. In one configuration, the gauge locks into this configuration and maintains its output, even when the engine is shut off. Alternatively, the gauge of the present invention automatically resets, thus not requiring a manual reset of the gauge.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: October 23, 2001
    Assignee: Engineered Products Company
    Inventor: Gregory Matthew Ferris
  • Patent number: 6268791
    Abstract: An air filter restriction indicating device communicating with the supply of air passing from an air filter to the air intake of an internal combustion engine. The indicating device senses a decrease in the supply of air drawn through the air filter by the engine based upon changes in the amount of vacuum in the negative side of the air supply, the amount of restriction being indicated by the movement of an indicating device. Improved means included in the indicating device senses the movement of the indicating device and progressively locks the indicating device into various indicating positions as the vacuum increases due to an increased restriction of the filter, so that the maximum reading of restriction achieved during engine operation remains visible to the operator or maintenance personnel even after the engine is turned off.
    Type: Grant
    Filed: May 12, 1999
    Date of Patent: July 31, 2001
    Assignee: Engineered Products Company
    Inventor: Gregory Matthew Ferris
  • Patent number: 6190442
    Abstract: An air filter cleanness gauge is provided. The gauge in a preferred embodiment includes a transparent cover. The housing has a first opening for fluid communication with the atmosphere and a second opening having fluid communication with a fluid source exposed to a filter. A vane is pivotally connected within the housing and provides a pressure boundary between the first and second openings. Movement of the vane indicates a change in pressure differential between the atmosphere and the fluid source, thereby indicating a need to change the air filter.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: February 20, 2001
    Assignee: Tishken Products Co.
    Inventor: Robert P. Redner
  • Patent number: 6161417
    Abstract: A restriction indicator for an air cleaner of an internal combustion engine. A bellows-type diaphragm is biased toward a retracted position by a first end of a compression spring. A calibration wheel threadingly engaging the housing supports a second end of the compression spring, such that the restriction indicator can be calibrated by rotation of the calibration wheel. An end of the compression spring is seated on a slanted seating surface so that a plunger is pushed off-center to engage a latch and lock the restriction indicator.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: December 19, 2000
    Assignee: Donaldson Company, Inc.
    Inventor: Larry R. Nepsund
  • Patent number: 6142094
    Abstract: A simple, mechanical device is provided which produces an acoustic signal a specified depth. The device consists of a shear plug in an exterior wall of the device housing which prevents the movement of a spring biased piston. The plug is subjected to increasing differential pressure between the exterior and interior of the housing as the depth of the device beneath the water surface increases. At a known pressure differential, corresponding to a specified depth, the shear plug fails, allowing for the actuation of the piston. The spring biased piston strikes against a ledge in the device, creating the acoustic signal.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: November 7, 2000
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Edmund J. Sullivan, Robert W. Gauthier
  • Patent number: 6096224
    Abstract: A filter alert has a pressure differential switch that is responsive to positive and/or negative pressure through a pressure tube. The pressure tube is in fluid communication intermediate a positive-pressure or high-pressure side of an intended filter and a positive-pressure inlet aperture of a pressure-differential switch for indication of positive pressure across the intended filter. Optionally, the pressure tube is in fluid communication intermediate a negative-pressure or low-pressure side of a filter and a low-pressure inlet aperture of the pressure-differential switch for indication of low pressure across the filter. The pressure-differential switch actuates an actuator for alarm signals for desired action. The filter alert also includes a switch condition communication component, a filter condition alert and an alert container on which the pressure-differential switch is positioned.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: August 1, 2000
    Inventor: Max C. Champie
  • Patent number: 6026539
    Abstract: A vacuum cleaner comprises a housing having a floor-engaging nozzle fluidly interconnected with a filter bag in a closed filter bag chamber in the housing through a suction passageway, an exhaust vent in the filter bag chamber to exhaust filtered air exiting from the filter bag chamber and a vacuum motor provided in the housing to draw air from the floor-engaging nozzle to the filter bag. An exhaust filter is mounted in the exhaust vent. A sensor in the filter bag chamber detects a condition representative of the flow of air through the exhaust filter element and an exhaust filter indicator interconnected with the sensor provides a signal to a user when the condition reaches a predetermined level to indicate a clogged condition of the exhaust filter. A sensor and indicator can also be provided for the filter bag so that independent signals can be generated relating to the clogged condition of one or both of the filter bag and exhaust filter.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: February 22, 2000
    Assignee: Bissell Homecare, Inc.
    Inventors: Brandon L. Mouw, John J. Jailor
  • Patent number: 5942193
    Abstract: A device for evaluating air removal is subjected to a sterilization process whose effectiveness is dependent on a sufficiently high vacuum being achieved. A closure or lid (20, 70) seals an opening into an interior chamber (12) of a container (10). The closure and container are mechanically interconnected, e.g., fricitonally, such that a preselected pressure differential across the closure is needed to release the closure. The friction or other mechanical interconnection level and a pressure in the interior chamber are selected such that when the exterior of the container is subject to a preselected vacuum, the closure releases. Ease or reliability of reading the indication is improved with a spring (50) for expelling the closure or a frangible member (56, 72) which is severed or irreversibly deformed as the closure releases.
    Type: Grant
    Filed: June 25, 1997
    Date of Patent: August 24, 1999
    Assignee: Steris Corporation
    Inventor: Kathryn A. Bolsen
  • Patent number: 5879544
    Abstract: A differential pressure indicator has a piston across which inlet and outlet pressures are applied with a spring preventing movement of the piston until a predetermined differential pressure is exceeded. At this point, a port is opened to allow the inlet pressure to be applied to an indicator button to move the indicator button from a retracted position to an operative extended position to indicate that the pressure differential has been exceeded. The use of fluid pressure to operate the indicator button applies a large force to the indicator button and allows it to be securely held in the inoperative position to guard against accidental movement by high G-forces.
    Type: Grant
    Filed: February 5, 1996
    Date of Patent: March 9, 1999
    Assignee: Pall Corporation
    Inventor: Ronald F. Cassidy
  • Patent number: 5845597
    Abstract: An efficiency indicator for a separation system, such as a water filter, wherein a first volume of fluid is exposed, under a first pressure, to a separation medium and a second volume of fluid is recovered therefrom, under a second, lesser pressure. The indicator comprises a housing including an aperture and a biased piston rod in a tube driven between a first position and a second spaced-apart position by the differential between said first and second pressures when said second pressure represents an undesired loss of medium separating efficiency. The piston rod has a first reflective colored coating at one location on said rod and a second reflective colored coating at a second location. A sphere of optical transparent material is mounted so as to project through the aperture of the housing.
    Type: Grant
    Filed: January 9, 1995
    Date of Patent: December 8, 1998
    Assignee: Vista Water Systems, Inc.
    Inventor: David L. Karpal
  • Patent number: 5774056
    Abstract: An indicating device includes a housing that is separated into two sub-chambers by a flexible diaphragm. A indicating member is carried by the diaphragm so that the diaphragm and the indicating member move, within the housing, responsively to changes in the pressure of the air flowing through an air intake system caused by restrictions in or clogging of the air intake filter. The indicating device incorporates an electromechanical sensor for monitoring the position of the diaphragm and producing an output signal responsive thereto. In one embodiment, the sensor is a potentiometer which produces an output signal which varies continuously between a first value when the diaphragm is at its unrestricted position and a second value when the diaphragm is at its restricted position. In a second embodiment, the sensor includes a switching circuit which produces a switched output signal which varies between at least three states corresponding to three different diaphragm positions.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: June 30, 1998
    Assignee: Engineered Products Co.
    Inventors: Charles Henry Berry, III, Jerry Lee Manross, Thomas Alan Stoll, Gregory Matthew Ferris, James Nathan Forry
  • Patent number: 5739755
    Abstract: A sensor for monitoring a cooling liquid circulating in a circuit of a heat exchanger of an automobile, for example, includes a support for mounting the sensor on a pipe of the circuit so that the liquid is in contact with at least a part of the sensor, a corrodible membrane in contact with the liquid, and a visual indicator reacting to the degree of corrosion of the liquid. The visual indicator includes a piston movable under the combined effect of the breaking of the corrodible membrane and of the pressure difference between inside and outside of the pipe, at least one seal mounted on the movable piston, and the visual indicator protruding from the pipe and/or from the support when the membrane is corroded.
    Type: Grant
    Filed: March 21, 1996
    Date of Patent: April 14, 1998
    Assignee: Institut Francais du Petrole
    Inventor: Emanuel Goldenberg
  • Patent number: 5702592
    Abstract: A filter monitoring device for use in monitoring the purity of a fluid through a filter includes a pressure differential sensing device in communication with the filter. The filter monitoring device defines an inlet port which is in communication with the supply of fluid upstream of the filter and an outlet port which is in communication with a supply of fluid downstream of the filter. The differential pressure sensing device comprises at least one movable device which is in contact with both the upstream and downstream supplies of fluid and moves in response to changes in the pressure differential of the fluid. Different total differential pressures are accommodated by corresponding stiffness of a biasing device. The differential pressure sensing device also comprises a distance sensing device which continuously measures or detects the distance of travel of the movable device.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: December 30, 1997
    Assignee: Western Filter Corporation
    Inventors: Kanwar Suri, Z. Paul Akian