Responsive To Condition External Of System Patents (Class 137/804)
  • Patent number: 9726588
    Abstract: This invention relates to a method of inducing fluid flow in a passive capillarity filled microfluidic device involving the use of a dual flow control reagent system, wherein the first flow control reagent is a surfactant which reduces surface tension of an aqueous fluid sample and the second flow control reagent is a viscosity enhancer.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: August 8, 2017
    Assignee: Molecular Vision Limited
    Inventors: Oliver Hofmann, Simon Rattle, Claire Walshe
  • Patent number: 9524268
    Abstract: A method of determining orientation parameters of a rigid body, including: associating at least two multi-axis accelerometers with the rigid body, wherein the body has a base end, a distal end, and a line of symmetry between the base end and the distal end. The two first multi-axis accelerometers are disposed at a first point along the line of symmetry between the base end and the distal end. Each first multi-axis accelerometer is disposed at equal distances from the line of symmetry. The line of symmetry and both first multi-axis accelerometers lie in a first plane. The method further includes: associating a gyroscope with the body at the first point, equally between both first multi-axis accelerometers; gathering measured data from the two first multi-axis accelerometers and the gyroscope; and applying analysis free of calculus to determine a first inclination angle, of the body from a stable orientation.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: December 20, 2016
    Assignee: University of Floria Research Foundation, Inc.
    Inventors: Carl D. Crane, III, Vishesh Vikas
  • Patent number: 9519266
    Abstract: A duct includes a suction port being connected to a first separate duct from a first direction, an exhaust port being connected to a second separate duct from the first direction, and a passage formed to extend from the suction port to the exhaust port. At least one of the suction port and the exhaust port includes a first opening portion that is opened to incline to the first direction and second opening portions at both ends of the first opening portion, the second opening portions that are opened in a transverse direction to the first direction.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: December 13, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventor: Shoji Sasaki
  • Patent number: 8890698
    Abstract: The invention relates to a drainage circuit (4) for a flow of a liquid (5), the circuit being fitted with a monitoring appliance (13) for monitoring an excess flow rate of the liquid (5). The monitoring appliance (13) comprises a monitoring duct (14) interposed between an upstream duct (7) for collecting the liquid (5) and a downstream duct (9) for discharging the liquid (5). The monitoring duct (14) has retaining means (15) for retaining part of the liquid (5) inside a chamber (16) arranged to receive a spillway (22) of the captured liquid (19) in a reserve (20) fitted with indicator means (23) with a visual scale for providing warning information relating to the quantity of liquid (24) contained in the reserve (20).
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: November 18, 2014
    Assignee: Airbus Helicopters
    Inventors: Stephane Mougin, Jean-Sebastien Catteau
  • Patent number: 8844570
    Abstract: Methods and devices for using one or more fluidic channels for generating binary states are described. In particular, the present teachings relate to incorporating such fluidic channels into devices that use the generated binary states in various applications.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: September 30, 2014
    Assignee: California Institute of Technology
    Inventor: Casey G. Glick
  • Patent number: 8657017
    Abstract: Apparatus and methods for controlling the flow of fluid, such as formation fluid, through an oilfield tubular positioned in a wellbore extending through a subterranean formation. Fluid flow is autonomously controlled in response to change in a fluid flow characteristic, such as density or viscosity. In one embodiment, a fluid diverter is movable between an open and closed position in response to fluid density change and operable to restrict fluid flow through a valve assembly inlet. The diverter can be pivotable, rotatable or otherwise movable in response to the fluid density change. In one embodiment, the diverter is operable to control a fluid flow ratio through two valve inlets. The fluid flow ratio is used to operate a valve member to restrict fluid flow through the valve.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: February 25, 2014
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jason D Dykstra, Michael Linley Fripp, Orlando DeJesus, John C. Gano, Luke Holderman
  • Patent number: 8571436
    Abstract: A gas transfer unit includes a transfer path forming member; a gas transferring member; and a gas purifying member as defined herein, and in a case where exhaustion is performed through the first exhaust port, the transfer vanes are rotated at a first rotation number, and, in a case where exhaustion is performed through the second exhaust port, the transfer vanes are rotated at a second rotation number which is higher than the first rotation number.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: October 29, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Masayuki Yamamiya
  • Patent number: 8479831
    Abstract: A system for variably resisting flow of a fluid composition can include a flow passage and a set of one or more branch passages which intersect the flow passage, whereby a proportion of the composition diverted from the passage to the set of branch passages varies based on at least one of a) viscosity of the fluid composition, and b) velocity of the fluid composition in the flow passage. Another variable flow resistance system can include a flow path selection device that selects which of multiple flow paths a majority of fluid flows through from the device, based on a ratio of desired fluid to undesired fluid in the composition. Yet another variable flow resistance system can include a flow chamber, with a majority of the composition entering the chamber in a direction which changes based on a ratio of desired fluid to undesired fluid in the composition.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: July 9, 2013
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jason D. Dykstra, Michael L. Fripp, Syed Hamid
  • Patent number: 8235128
    Abstract: A system for variably resisting flow of a fluid composition can include a flow passage and a set of one or more branch passages which intersect the flow passage, whereby a proportion of the fluid composition diverted from the passage to the set of branch passages varies based on at least one of a) viscosity of the fluid composition, and b) velocity of the fluid composition in the flow passage. Another variable flow resistance system can include a flow path selection device that selects which of multiple flow paths a majority of fluid flows through from the device, based on a ratio of desired fluid to undesired fluid in the fluid composition. Yet another variable flow resistance system can include a flow chamber, with a majority of the fluid composition entering the chamber in a direction which changes based on a ratio of desired fluid to undesired fluid in the fluid composition.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: August 7, 2012
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jason D. Dykstra, Michael L. Fripp, Syed Hamid
  • Patent number: 6924733
    Abstract: A hose separation transmitter system includes a shock sensor and a transmitter that are secured to the delivery hose. If the hose becomes disconnected, the shock sensor will generate a shock signal when the hose falls to the ground and the transmitter will respond to the shock signal by generating an encoded RF signal. A receiver at the vehicle receives the RF signal from the transmitter, determines that a hose disconnect has occurred, and automatically disables a fluid pump or closes a valve to stop the flow of fluid. The shock sensor preferably uses a strip of piezoelectric material. Related methods are also disclosed. For quick connect and disconnect, the shock sensor and transmitter are preferably secured to the hose by a hook and loop fabric material. The transmitter is immune to normal ambient vibration levels. Related methods are also disclosed.
    Type: Grant
    Filed: August 21, 2003
    Date of Patent: August 2, 2005
    Assignee: McTier Supply Company
    Inventors: Samuel E. McTier, Jack Glandon, William B. McDonough
  • Patent number: 6669831
    Abstract: Methods and devices for inducing high bulk hydrodynamic resistance and/or for inducing low electrical resistance in microscale systems including bulk viscosity enhancers, surfactants, and electrolytes. High bulk hydrodynamic resistance is optionally utilized to regulate the effects of spontaneous injection and/or dispersion. Induced high hydrodynamic resistance in conjunction with induced low electrical resistance are optionally utilized to provide and regulate electrical fields within microfluidic devices. Integrated systems incorporating the methods of the invention are also provided.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: December 30, 2003
    Assignee: Caliper Technologies Corp.
    Inventors: Andrea W. Chow, Carlton Brooks
  • Patent number: 6424923
    Abstract: A method for computing three dimensional unsteady flows about an object. An allowable error is established for the vorticity term calculations, and object geometry is provided giving surface points on an object and a region of interest. A mesh is established incorporating points on the object. Initial flow conditions are set at the surface. Vorticity values that will satisfy boundary conditions are set at the provided surface points. A new mesh is established incorporating the provided points and other points in the region of interest. Boxes are generated containing the provided points and other points. Velocities and pressures at each point are calculated from the flow conditions, vorticity values and boundary conditions., A time variable is incremented and each point is moved by applying the calculated velocity. Vorticity at each point is then recalculated. The method is iterated starting with the step of satisfying boundary conditions until the incremented time variable exceeds a predetermined value.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: July 23, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Stephen A. Huyer, John R. Grant, James S. Uhlman, Jeffrey S. Marshall
  • Patent number: 5927335
    Abstract: A fluidic ball diverter valve for use in aerospace applications for diverting the output of a fluidic amplifier comprises a valve chamber having an inlet and two outlets. The orientation of the outlet valve seats is such that a line of action between the valve seats passing through the center of the valve ball defines an angle less 180 degrees. The orientation of the outlet valve seats permits the entire laminated fluidic amplifier module and at least a portion of the ball diverter valve itself to be mounted within the pressure vessel of the gas generator itself. By moving these components inside the pressure vessel, the pressure differential experienced by the components is substantially less than if the components were mounted outside the pressure vessel. This permits the components to be of substantially lighter construction.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: July 27, 1999
    Assignee: AlliedSignal Inc.
    Inventor: Donald Jeffrey Christensen
  • Patent number: 4945764
    Abstract: A laminar jet angular rate sensor senses inertial angular rate in flight control and stabilization systems for aircraft and other vehicles. The sensor utilizes fluid as a power source and may be interfaced directly with fluid powered actuators for closed loop rate stabilization of the vehicle. To be practical, the rate sensor must exhibit consistent operation over the side range of supply fluid temperatures seen in a typical application. This invention involves apparatus for providing constant sensor gain over a wide range of fluid viscosity conditions. To achieve this, the pressure drop across the rate sensor is varied proportional to supply fluid viscosity to overcome viscous momentum losses in the jet and provide a constant gain characteristic. The specific apparatus of the invention utilizes a pressure regulator with a fluid viscosity sensor to accurately provide the required supply pressure proportional to fluid viscosity schedule.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: August 7, 1990
    Inventor: Gary L. Frederick
  • Patent number: 4856338
    Abstract: A null balanced fluidic sensing system that is less susceptible to pressure upply disturbances includes sensing and amplifying elements in a closed loop arrangement. The differential output of the sensor, developed as a result of an input stimulus, is fed into the inputs of a single sided amplifier. The output of the amplifier is used as a source of supply for the sensor. This closed loop arrangement uses the null offset characteristics of the elements to create a null balanced fluidic sensing system.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: August 15, 1989
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: R. Michael Phillippi, Francis M. Manion
  • Patent number: 4846233
    Abstract: This invention relates to a method and a system for selectively filling or emptying a tank by a filling or discharging device for the tank. In accordance with the invention, a passive responder and an aerial element of an electromagnetic detection system are respectively provided in the vicinity of the inlet or outlet of the tank and on the part of the filling or discharging device cooperating with the tank inlet or outlet. The aerial element forms part of a detection system for generating an electromagnetic interrogation field, which detection system generates a signal when detecting a responder. In one embodiment of the invention, the responder is a passive responder generating a uniquely coded signal by which the detection system identifies the responder.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: July 11, 1989
    Assignee: N.V. Nederlandsche Apparatenfabriek Nedap
    Inventor: Tallienco W. H. Fockens
  • Patent number: 4823593
    Abstract: The temperature range for stable operation of a flueric partial pressure sensor (300) is improved by temperature-responsive means (80, 60) which vary with temperature change the suction applied by a flueric aspirator (27) in drawing gas through sensor bridge legs (12, 13) and a power line (37) of a flueric amplifier (11). The temperature-responsive means may comprise temperature-sensitive adjustment means (107, FIG. 2) embodied in a pressure reducing valve (80) to vary the pressure of working gas supplied by way of delivery line (28) for driving the flueric aspirator. Alternatively or additionally the temperature-responsive means may comprise a temperature-sensitive bleed valve (60) incorporated in a common outlet (14) from the bridge legs and the flueric amplifier power line.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: April 25, 1989
    Assignee: Normalair-Garrett (Holdings) Limited
    Inventors: Owen D. Furlong, Searle, Robin H. J.
  • Patent number: 4775016
    Abstract: An improved feedback system for use with an oscillator carried in a bore hole is provided. The feedback system connects the output legs of a well bore oscillator to the feedback nozzles of the oscillator. It consists of a detachable housing that contains two compliance chambers. Each chamber has a supply port and an exhaust port. Inertance passageways allow fluid to pass through each chamber.
    Type: Grant
    Filed: September 29, 1987
    Date of Patent: October 4, 1988
    Assignee: Hughes Tool Company - USA
    Inventor: Louis H. Barnard
  • Patent number: 4630689
    Abstract: A downhole pressure fluctuating tool having an improved acoustical circuit using a fluid oscillator to generate out-of-phase pressure fluctuations in two output legs, one connected to an acoustical compliance inside the tool and the other connected to an acoustical compliance exterior of the tool in a cavity partially formed by the wall of the well. An acoustical inertance with a pressure node at its midregion connects the two acoustical compliances, and said midregion communicates with the annulus between the body of the tool and the wall of the well to discharge fluid from the body at the pressure node to minimize acoustical losses in the annulus.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: December 23, 1986
    Assignee: Hughes Tool Company-USA
    Inventors: Edward M. Galle, Billey E. Baker
  • Patent number: 4550614
    Abstract: Each guide member of a fluidic oscillator has a diverter which acts to split the flow from the power nozzle into a control stream that is diverted toward the inlet of an associated feedback path and an output stream that is directed toward an output duct. The resultant fluidic forces exerted alternately on the diverters are sensed, and the sensor outputs are processed to generate a sinusoidal wave from which volumetric flow or mass flow output signals are derived.
    Type: Grant
    Filed: January 14, 1985
    Date of Patent: November 5, 1985
    Assignee: Fischer & Porter Company
    Inventor: Peter J. Herzl
  • Patent number: 4523611
    Abstract: A method and apparatus for converting the absolute pressure of a pressuri fluid to a differential pressure indicating the fluid pressure relative to a reference pressure. The pressurized fluid is directed asymmetrically into a laminar proportional amplifier (LPA) along a centerline toward a first of two outlets at a velocity determined by the fluid pressure. The LPA includes first and second control inlets disposed on opposite sides of the directed fluid jet and connected to a common source of control fluid, the first control inlet being disposed on the same side as the first outlet, and the second control inlet being disposed on the same side as the second outlet.
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: June 18, 1985
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Tadeusz Drzewiecki
  • Patent number: 4501293
    Abstract: Signal output means (11) responsive to gas flow and particularly suited for use in gas flow indicator apparatus (10), has first and second pressure-datum valves (24, 25) arranged in downstream order in a gas conduit (16), the second pressure-datum valve (25) being arranged to open at a lower pressure difference than the first pressure-datum valve (24). A flueric amplifier (15) has a power jet port (28) connected to the gas conduit (16) on the upstream side of the first pressure-datum valve (24), opposed control pressure ports (26, 27) connected respectively to a chamber (22) formed between the first and second pressure-datum valves (24, 25) and to the gas conduit (16) downstream of the second pressure-datum valve (25), and a vent port (30) also connected to the gas conduit (16) downstream of the second pressure-datum valve (25). A pressure signal output by the flueric amplifier (15) in response to gas flow through the conduit (16) may be used to trigger a visual or audio warning device (14).
    Type: Grant
    Filed: September 8, 1982
    Date of Patent: February 26, 1985
    Assignee: Normalair-Garrett (Holdings) Limited
    Inventors: Owen D. Furlong, Leonard Moore, Jonathan D. Ward
  • Patent number: 4484601
    Abstract: A liquid level control device for controlling the flow of liquid into a reservoir, storage tank or the like, incorporating automatic shut-off characteristics. The device includes nozzle means including a fluid amplifier for automatically closing valve means in response to sensing means disposed remote from the nozzle means and fluid amplifier. The remote sensing means is responsive to the static presence of the interface at a sensing level of liquid in the reservoir.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: November 27, 1984
    Inventor: Daniel N. Campau
  • Patent number: 4460018
    Abstract: An ultralow pressure relief valve (10) is disclosed. Sealing fluid (24) is held in place by capillary forces inside capillary tube (12). When pressure in tube (11) exceeds capillary forces, sealing fluid (24) is forced into reservoir (14), protecting pressure gage (20) from overpressurization.
    Type: Grant
    Filed: June 19, 1981
    Date of Patent: July 17, 1984
    Assignee: Philip Morris, Incorporated
    Inventor: William R. Sweeney
  • Patent number: 4445377
    Abstract: A pressure-to-electric output system is used to convert the dual outlet pressure signals of a fluidic angular rate sensor to a pair of oscillating electrical signals whose relative frequency differential is very accurately indicative of the sensor outlet pressure differential. The sensor outlets are fluidically coupled to the control ports of the first amplifier in a cascaded series of fluidic proportional amplifiers. The outlet ports of the terminal amplifier are coupled to the inlet ports of a pair of fluidic oscillators. A pair of microphone type pressure-to-electric transducers are driven by the oscillators to produce the oscillating electrical signals.
    Type: Grant
    Filed: November 12, 1980
    Date of Patent: May 1, 1984
    Assignee: The Garrett Corporation
    Inventor: Thomas B. Tippetts
  • Patent number: 4407153
    Abstract: A flueric partial pressure sensor includes a flueric bridge having two bridge legs adapted for sensing a reference-gas and sample-gas mixture. A linear resistor and an orifice resistor are incorporated in each of the bridge legs which are conjoined to discharge from a single outlet. The resistors are arranged to provide an asymmetric balance of the flow rates through the bridge legs. The asymmetric balance is selected so that in operation a constant pressure output signal is generated for a chosen partial pressure of a constituent gas of the sample-gas mixture in varying absolute pressure conditions such as changes in altitude. Respective pressure signal outlets connected one with each bridge leg at a position between the linear resistor and the orifice resistor are used to effect control of a flueric laminar flow proportional amplifier. Outputs from the flueric amplifier may be used to regulate a fluid mixing valve shown in FIG. 3, or to effect switching of an indicator device shown in FIG. 4.
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: October 4, 1983
    Assignee: Normalair-Garrett (Holdings) Limited
    Inventors: Owen D. Furlong, Leonard Moore
  • Patent number: 4326559
    Abstract: A fluidic accelerometer and electromagnetic transducer formed from a plurty of vertical laminations having a nozzle, a pair of outlets for receiving nozzle fluid and a flexible member as an extension of one of the laminations which forms a vertical wall of said nozzle extending into a chamber between the nozzle and the outlets. The flexible member is responsive to acceleration or electromagnetic forces transverse the nozzle centerline to vary the proportion of nozzle fluid received by each outlet. The flexible member is separated from the horizontal walls of the chamber by a selected small distance to create sufficient viscous shear force to effectuate damping.
    Type: Grant
    Filed: April 25, 1980
    Date of Patent: April 27, 1982
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Tadeusz M. Drzewiecki
  • Patent number: 4289126
    Abstract: A pressure regulator for breathing apparatus which utilizes a low pressure control signal to control the inhalation of gases through the regulator. A first low pressure control valve is actuated by the diver's inhalation effort to provide a pressure signal which is used to control a main valve which supplies the breathing mixture input to the diver. Separate exhalation exhaust assist may be provided which utilizes energy from the air tank to help eject the diver's exhaust gases from the regulator.
    Type: Grant
    Filed: May 2, 1979
    Date of Patent: September 15, 1981
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Ali A. Seireg, Amr M. S. Baz
  • Patent number: 4277971
    Abstract: A fluidic oil viscometer for determining the degradation of machinery lubating oils compares the viscosity of the machinery oil with the viscosity of another fluid, such as air. Both the viscosity of the air and the viscosity of the oil are sensed, using capillary-orifice combination sensors, and the air viscosity reading is amplified using a series of laminar proportional amplifiers to equalize its change in viscosity with that of oil. The outputs of the capillary orifice combination sensors are applied to two different pressure gauges, the difference between these two pressure gauges represents the viscosity breakdown. This difference will be independent of temperature.
    Type: Grant
    Filed: January 10, 1980
    Date of Patent: July 14, 1981
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Tadeusz M. Drzewiecki, Richard M. Phillippi
  • Patent number: 4265116
    Abstract: A fluidic analog temperature sensor which compensates for variations in the supply pressure to the temperature sensor.
    Type: Grant
    Filed: October 1, 1979
    Date of Patent: May 5, 1981
    Assignee: The Garrett Corporation
    Inventor: Paul S. Evans
  • Patent number: 4258754
    Abstract: A new method and apparatus for fluid sound amplification and detection having enclosed within a predetermined sized housing a fluid supply emitter in combination with a signal input port and spaced a predetermined distance therefrom along an axis offset a determined distance from the fluid supply emitter axis, at least one receiver, the receiver being responsive to gradient differences in fluid pressure as effected by laminar flow of the fluid from the emitter, a filter connected to the receiver for removing relatively high frequency noise, a diaphragm coupler receiving the output of the filter, the coupler having an output for use as a signal input to another predetermined sized housing, emitter, signal input port and at least one receiver combination. A suitable input transducer is connected to the signal input port of the first housing combination and a suitable output transducer such as a recording microphone and oscilloscope is connected to a receiver output of the second housing combination.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: March 31, 1981
    Inventor: Charles G. Pickett
  • Patent number: 4170894
    Abstract: In order to determine the density of a test gas, the test gas is employed as the working fluid through an astable fluidic oscillator. Air, at the same temperature and pressure, is passed through the same or a like fluidic oscillator to obtain a second pulse repetition frequency reading. The density of the test gas is the ratio of the two pulse repetition frequencies. Preferably, for a given fluidic oscillator, graphs and/or tables are prepared giving the pulse repetition frequency of air at different temperatures and pressures in order that subsequent measurement of the pulse repetition frequency using a test gas will permit direct determination of the specific gravity of the test gas from a graph or table.
    Type: Grant
    Filed: May 1, 1978
    Date of Patent: October 16, 1979
    Assignee: Sun Oil Company
    Inventor: Joseph E. Zupanick
  • Patent number: 4007625
    Abstract: A fluidic oscillator assembly including a fluidic oscillator having an inlet and two outlets, and a piezoelectric element for picking-up frequency oscillations induced in the fluid oscillator, the piezoelectric element being located at and closing one of the outlets of the fluidic oscillator.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: February 15, 1977
    Assignee: A. Monforts
    Inventors: Heinz Houben, Manfred Pabst
  • Patent number: 4003242
    Abstract: Device for determining the mixing ratio of binary gases in a mixture thereof by measuring the velocity of sound in the gas mixture, the value of the velocity of sound in the gas mixture determined by the oscillating frequency of a fluidic oscillator, the absolute temperature (T.sub.r) of the gas mixture in the feedback means of the oscillator, a correction factor proportional to the difference between the absolute temperature (T.sub.r) and the predetermined temperature (T.sub.o).
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: January 18, 1977
    Assignee: A. Monforts
    Inventors: Heinz Houben, Manfred Pabst
  • Patent number: 3998574
    Abstract: A system for controlling a molding machine utilized to mold food products on a stick. The system incorporates fluidic logic elements that are responsive to signals generated by the piston position in actuation cylinders so that the system control is dependent on the process condition, rather than on timing or other indirect process control methods. The fluidic logic elements command the actuating cylinders through air piloted valves, in a wholly pneumatic system. The control system is continuously recycled with minimal delay between cycles unless a failure of the system to produce a complete and dispensed produce is sensed. The dispensing of the product is positively determined by a fluidic sensor and a logic control circuit that determines that the product has dropped into and through a sensing airstream. If a malfunction is detected the machine shuts down and will not restart unless the start-stop control is cycled, so that the machine may be safely serviced.
    Type: Grant
    Filed: October 3, 1975
    Date of Patent: December 21, 1976
    Inventor: Frederick H. Blake
  • Patent number: 3986526
    Abstract: A train of fluid pulses representative of a process variable is processed by digital fluidic circuits and is then converted into an analog fluid pressure signal which is compared to an analog command signal, the difference between the two compared signals being caused to appear in the form of a displacement. This displacement is amplified by means of a fluid servo system, the amplified output of which is utilized for directly driving a control element for a process.
    Type: Grant
    Filed: June 14, 1974
    Date of Patent: October 19, 1976
    Assignee: Sun Oil Company of Pennsylvania
    Inventors: Robert C. C. Chang, William M. Scott
  • Patent number: 3971257
    Abstract: A laminar jet linear accelerometer includes a plenum chamber to which prerized fluid is supplied and a nozzle operatively associated with the chamber for issuing the fluid in the form of a jet. The jet is conducted into another chamber, which is vented to an ambient environment, and output channels, having fluidic output sensors disposed therein, are disposed downstream of the vented chamber. Under non-acceleration conditions, the issued jet uniformly impinges upon the sensors and a zero differential output is sensed and indicated, thereby indicating the absence of an applied acceleration. Under applied acceleration conditions, however, the jet flow is deflected by means of the applied acceleration and consequently, such flow impinges upon the sensors in a non-uniform manner. A differential output is thus sensed and the value or magnitude of the acceleration applied may be determined therefrom.
    Type: Grant
    Filed: August 14, 1975
    Date of Patent: July 27, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Tadeusz M. Drzewiecki
  • Patent number: 3942556
    Abstract: Disclosed is a fluidic sensor of the proximity type with improved sensing range and response. The sensor generally comprises an inner and outer tubes with an annular passageway therebetween. Air or the like under a low pressure (e.g. 4 pounds per square inch) is introduced in the annular passageway. Presence of an article near the discharge end of the device causes the air to be diverted down the interior of the inner tube and such a "signal" can be used to initiate or terminate control actions. The inner tube in the present invention has a novel exterior configuration which provides increased sensitivity which allows higher recovery (signal/supply) ratios and/or sensing at greater distances than possible with the prior art.
    Type: Grant
    Filed: September 30, 1974
    Date of Patent: March 9, 1976
    Assignee: Dana Corporation
    Inventor: Richard J. Wojcikowski