With Fire Extinguisher (e.g., Co2) Patents (Class 340/289)
  • Patent number: 11204438
    Abstract: Properties of a geological formation, such as vertical resistivity values, horizontal resistivity values, dip, and azimuth may be determined by inverting electromagnetic (EM) well log data based at least in part on an anisotropic formation model and a cost function. The cost function may include a data misfit term, a smoothness term, and an entropy term. In some embodiments, one or more of the data misfit term, the smoothness term, and the entropy term may be represented as functions of vertical conductivity and horizontal conductivity. The cost function may include one or more regularization parameters that are based at least in part on the data misfit term. Further, the cost function may include one or more relaxation factors that are based at least in part on a ratio of the Hessians of the smoothness term and the data misfit term.
    Type: Grant
    Filed: October 25, 2019
    Date of Patent: December 21, 2021
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Gong Li Wang, Koji Ito, Xiao Bo Hong
  • Patent number: 8529635
    Abstract: A system and method for securing and tracking an electronic device. The system includes hardware, software and firmware components that cooperate to allow tracking, disabling, and other interaction with the stolen electronic device. The system includes an application component, non-viewable component and Basic Input/Output Subsystem (BIOS) component that are present on the electronic device. The BIOS component maintains the secured environment of the application and non-viewable components. If only the application component was provided, a simple low level format of the hard disk drive would remove the application and bypass the security features. The system implements an “application and BIOS” based solution to electronic device security.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: September 10, 2013
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8506649
    Abstract: A system and method for securing and tracking an electronic device. The system includes hardware, software and firmware components that cooperate to allow tracking, disabling, and other interaction with the stolen electronic device. The system includes an application component, non-viewable component and Basic Input/Output Subsystem (BIOS) component that are present on the electronic device. The BIOS component maintains the secured environment of the application and non-viewable components. If only the application component was provided, a simple low level format of the hard disk drive would remove the application and bypass the security features. The system implements an “application and BIOS” based solution to electronic device security.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: August 13, 2013
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8490710
    Abstract: In-computer fire suppression, the computer comprising an in-computer flame detector and an in-computer fire extinguisher including detecting, by an in-computer flame detector, a flame, releasing, by the in-computer fire extinguisher, an extinguishing agent in response to the flame detector detecting the flame; and disabling the power supply to the computer having within it the in-computer flame detector and the in-computer fire extinguisher.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: July 23, 2013
    Assignee: International Business Machines Corporation
    Inventors: Matthew R. Archibald, Jerrod K. Buterbaugh
  • Patent number: 8485271
    Abstract: In-computer fire suppression, the computer comprising an in-computer flame detector and an in-computer fire extinguisher including detecting, by an in-computer flame detector, a flame, releasing, by the in-computer fire extinguisher, an extinguishing agent in response to the flame detector detecting the flame; and disabling the power supply to the computer having within it the in-computer flame detector and the in-computer fire extinguisher.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: July 16, 2013
    Assignee: International Business Machines Corporation
    Inventors: Matthew R. Archibald, Jerrod K. Buterbaugh
  • Patent number: 8418774
    Abstract: A fire extinguishing system for a casing, preferably an electronics casing, consisting of an extinguishing agent container, in which the extinguishing agent is stored, and a control device for the flow of extinguishing agent is provided, wherein a preferably cuboid extinguishing agent container (2) forms together with the devices (5, 7, 8, 29, 31, 32) required for storing and monitoring the loss of extinguishing agent, for controlling the flow of extinguishing agent from the container and for connecting a discharge device for the extinguishing agent, a complex structural component (24, 28), and wherein the devices (5, 7, 8, 29, 31, 32) are fastened at or integrated in the extinguishing agent container (2) in such a manner that this may be transported, installed or arranged in the casing (18) as a compact structural component (FIG. 2).
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: April 16, 2013
    Assignee: Minimax GmbH & Co. KG
    Inventors: Joachim Gensel, Wolfgang Habitzl, André Lickefett
  • Patent number: 8361166
    Abstract: A system and method for presenting electronic device security and tracking information. A method includes but is not limited to making accessible at least one first webpage capable of presenting a category for an electronic device registered with an electronic device security and tracking system and method (ESTSM) service; making accessible at least one second webpage capable of accepting a report that the electronic device has been stolen; and making accessible at least one third webpage capable of accepting at least one item of information pertaining to enablement of the electronic device.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: January 29, 2013
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8292969
    Abstract: A system and method for electronic device protection. A method includes activating the electronic device; transferring control to a Basic Input/Output System (BIOS) component after activation; transferring control to a non-viewable component from the BIOS component; verifying that an application component operated correctly during a previous device activation; and continuing with activation of the electronic device if the application component operated correctly during the previous device activation.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: October 23, 2012
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8287603
    Abstract: An electronic device has software for protecting the electronic device from unauthorized utilization. When executed, the software causes the electronic device to execute an application component, wherein the application component is configured to automatically ascertain whether the electronic device has been reported stolen, based on information received from a server system. The electronic device also automatically determines whether the application component is operating correctly, and if so, automatically provides a basic input/output system (BIOS) component of the electronic device with information indicating that the application component is operating correctly. During a subsequent boot process for the electronic device, the software automatically prevents the electronic device from completing the boot process if the BIOS component does not find the information from the application component indicating that the application component was operating correctly. Other embodiments are described and claimed.
    Type: Grant
    Filed: August 7, 2009
    Date of Patent: October 16, 2012
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8241368
    Abstract: In a method for securing and disabling an electronic device, the electronic device automatically executes a basic input/output system (BIOS) component of a security and tracking service during boot up. The BIOS component automatically determines whether an application component of the security and tracking service has requested disabling of the electronic device. In response to a determination that the application component has requested disabling of the electronic device, the BIOS component automatically displays system information and unlock key. The BIOS component also automatically prompts a user of the electronic device to enter an activation password to re-enable the electronic device. Other embodiments are described and claimed.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: August 14, 2012
    Assignee: Softex Incorporated
    Inventors: Apurva M. Bhansali, Manoj K. Jain, Shradha Dube, Gayathri Rangarajan, Mehul R. Patel, Rayesh K. Raikar, Kamal M. Dhanani, Ranjit Kapila, Elza A. Varghese, Thomas D. Tucker
  • Patent number: 8182548
    Abstract: An electronic device security and tracking system. A system includes one or more clients, wherein the clients are electronic devices; and a server computer system connected to each of the clients, wherein the server computer system is capable of tracking and locating each of the clients. In one aspect, the server computer system includes one or more web servers coupled to each of the clients, wherein the web servers include a website for the electronic device security and tracking system; one or more file transfer protocol servers coupled to each of the web servers; and one or more database servers connected to each of the web servers.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: May 22, 2012
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8163035
    Abstract: This disclosure relates to interference management for a security and tracking system of an electronic device. In one embodiment, during a startup process, an electronic device executes a security program and automatically attempts to access a first web server to ascertain whether the electronic devices has been reported as stolen. In response to an unsuccessful attempt to access the first web server, the electronic device may automatically attempt to access a second web server for data regarding operational status of the first web server. In response to unsuccessful attempts to access the first and second web servers, the electronic device may automatically present an interference alert to provide notification that the electronic device will be disabled if the electronic device continues to experience interference. The electronic device may be automatically disabled in response to a predetermined number of startup sequences with interference. Other embodiments are described and claimed.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: April 24, 2012
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8137410
    Abstract: A method for tracking, locating and disabling an electronic device. A method includes checking if an application component operated correctly during last power-up of the device; and placing the device under control of power on self test to proceed with powering-up the device if the application component operated correctly during last device power-up.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: March 20, 2012
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 8128710
    Abstract: A system and method for securing and tracking an electronic device. A method includes but is not limited to accepting a selection of a service to erase a hard disk drive in the electronic device; recording that the electronic device has been reported stolen; and erasing the hard disk drive.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: March 6, 2012
    Assignee: Softex Incorporated
    Inventors: Apurva Mahendrakumar Bhansali, Manoj Kumar Jain, Shradha Dube, Gayathri Rangarajan, Mehul Ramjibhai Patel, Rayesh Kashinath Raikar, Kamal Mansukhlal Dhanani, Ranjit Kapila, Elza Abraham Varghese, Thomas David Tucker
  • Patent number: 7449990
    Abstract: Presented is a communications protocol for use by interconnected hazardous condition detectors, such as smoke and carbon monoxide detectors for use in dwellings and other structures. This communications protocol provides conventional signaling to indicate the presence of a smoke condition necessitating the generation of a smoke temporal pattern by all interconnected detectors. The protocol further defines a signaling method by which conventional smoke detectors that are incapable of providing temporal patterns other than that required for a smoke alarm condition will not be sent into an alarm mode of operation upon receipt of a signal other than the conventional smoke alarm signal. This communications protocol defines a pulsed signal to indicate a non-smoke alarm condition that is of a duration that will not trigger the conventional smoke alarms.
    Type: Grant
    Filed: May 17, 2004
    Date of Patent: November 11, 2008
    Assignee: Walter Kidde Portable Equipment, Inc.
    Inventors: John J. Andres, Michael W. Apperson, Joseph G. DeLuca, Chris R. Gilbert, Craig Kleinberg, Larry Ratzlaff, Stephen M. Ernst, John Wurtenberger
  • Patent number: 7346933
    Abstract: A device in one example comprises a standalone universal serial bus keyboard emulator and an ultrasonic sensor component. The standalone universal serial bus keyboard emulator is coupled with a computer through a universal serial bus port. The ultrasonic sensor component is coupled with the standalone universal serial bus keyboard emulator. The ultrasonic sensor component communicates one or more signals to the standalone universal serial bus keyboard emulator that serve to allow the standalone universal serial bus keyboard emulator to make a determination of entry to or exit from a predetermined proximity of the computer by a user. The determination of entry to or exit from the predetermined proximity of the computer by the user causes the standalone universal serial bus keyboard emulator to send a corresponding entrance or exit user configurable keystroke sequence to the computer through the universal serial bus port.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: March 18, 2008
    Assignee: ComputerProx Corporation
    Inventors: Gregory James Gliniecki, Mark Thomas Elliott
  • Patent number: 6977596
    Abstract: A location system is provided for a fire extinguisher that identifies and locates a fire extinguisher in response to a smoke alarm. The location system is connected to the fire extinguisher to permit a user to quickly locate, find and use the fire extinguisher upon the activation of the smoke alarm. The location system may take the form of a mechanical-electrical system directly connected to the fire extinguisher or may take the form of an alerting system situated very close to the fire extinguisher or connected to the fire extinguisher for transmitting a signal via free space upon the receipt of an activation signal from the smoke alarm system. The purpose of the location system is to identify the location of the fire extinguisher for a user in response to an audio alert being generated by the smoke alarm.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: December 20, 2005
    Inventor: Winfield Joel Brown
  • Patent number: 6788208
    Abstract: A method and a fire-alarm system controls stationary fire-extinguishing systems. The fire-alarm devices of the fire-alarm system are equipped with one or more detectors. If at least one pre-adjustable alarm threshold of a fire identification characteristic is reached, the fire-extinguishing device is activated and the fire detectors are selectively switched to a higher stage of sensitivity. The detectors to be switched are locally selected depending on the actual development of the fire in terms of space. The dynamic adaptation of the sensitivity of the detectors to the development of a fire permits analyzing the development of the fire through the generated smoke, water vapor or extinguishing-water mist, and to influence the fire-extinction process in a targeted manner.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: September 7, 2004
    Assignee: Minimax GmbH
    Inventor: Hauke Dittmer
  • Patent number: 6317053
    Abstract: A switch cabinet is provided for protection of servers and other highly sensitive computer devices or miscellaneous equipment. The cabinet is configured as a protection cabinet with an interior isolated from the atmosphere. The interior is continuously provided with fresh air by a ventilator. Fresh air is controlled by early detection fire sensors shortly before passing through the ventilator. When fire breaks out, the early detection fire sensors activate gas bottles filled with the noble gas argon, so that argon can be introduced into the interior to extinguish the fire once fresh air supply has been stopped, thereby ensuring early and fast extinguishing of the blaze.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: November 13, 2001
    Inventors: Hans-Dieter Seeliger, Uwe Kühn
  • Patent number: 6311779
    Abstract: A portable fire extinguisher assembly includes a fire extinguisher with a tank containing fire extinguishing material, a valve for metering release of the fire extinguishing material, and a gauge displaying pressure within the tank, and a docking station in communication with the fire extinguisher. An electronic circuit in communication with the fire extinguisher and the docking station issues a signal upon detection of predetermined conditions, including at least one predetermined internal condition and at least one predetermined external condition.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: November 6, 2001
    Assignee: Mija Industries, Inc.
    Inventors: Brendan T. McSheffrey, John J. McSheffrey, Michael R. Levenson
  • Patent number: 6302218
    Abstract: A portable fire extinguisher assembly includes a fire extinguisher with a tank containing fire extinguishing material, a valve for metering release of the fire extinguishing material, and a gauge displaying pressure within the tank, and a docking station in communication with the fire extinguisher. An electronic circuit in communication with the fire extinguisher and the docking station issues a signal upon detection of predetermined conditions, including at least one predetermined intenal condition and at least one predetermined external condition. The fire extinguisher electronic circuit includes cooperative male and female electrical/communication connection elements defined by the fire extinguisher and docking station.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: October 16, 2001
    Assignee: Mija Industries, Inc.
    Inventors: Brendan T. McSheffrey, John J. McSheffrey, Michael R. Levenson
  • Patent number: 5955939
    Abstract: An improved alarm activation station protector for use with a depressible alarm activating member and which is capable of being accessed by individuals with varying degrees of hand and arm disability. A wall mounted frame member is formed in a generally "U" shape with first, second and third interconnecting sides and a centrally open area for receiving the depressible alarm activating member. A transparent protective cover includes first, second and third sides which slidably engage the frame member and an arcuate shaped body which permits the cover to be arranged over the alarm. Slidably interlocking means established between the frame member and protective cover permit the cover to be pushed upwardly with the use of a stubbed hand or arm portion and without the need of fingers to grasp the cover. The cover is elevated to a desired height, at which point the individual can activate the alarm by depressing the exposed alarm member inwardly.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: September 21, 1999
    Inventor: John A. Taylor
  • Patent number: 5883568
    Abstract: The system includes a sensor for each junction box in the building to be guarded, e.g., the residence, and a display panel showing the temperature of any junction box that is heated above the danger point. Another display panel shows the name of the resident and address of the residence, and the location of the heated junction box by room number and junction box number and the shape of the junction box. A plurality of residences are connected with a central station, such as a fire station, by a single telephone line to each residence. A single processing unit is located in each residence, and a single such unit is located in the central display station. A display panel is located in the central station identical with each display in a residence.
    Type: Grant
    Filed: August 5, 1997
    Date of Patent: March 16, 1999
    Assignee: Computer Fire Products Solutions, Inc.
    Inventor: David Boyden
  • Patent number: 5848651
    Abstract: A portable fire extinguisher assembly includes a fire extinguisher with a tank containing fire extinguishing material, a valve for metering release of the fire extinguishing material, and a gauge displaying pressure within the tank, and a docking station in communication with the fire extinguisher. An electronic circuit in communication with the fire extinguisher and the docking station issues a signal upon detection of predetermined conditions, including at least one predetermined internal condition and at least one predetermined external condition. The fire extinguisher electronic circuit includes cooperative male and female electrical/communication connection elements defined by the fire extinguisher and docking station.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: December 15, 1998
    Assignee: Mija Industries, Inc.
    Inventors: Brendan T. McSheffrey, John J. McSheffrey, Michael R. Levenson
  • Patent number: 5760678
    Abstract: A pull box for an emergency alarm system is disclosed having a modular construction that accommodates one or more optional modules in order to provide a wide variety of possible configurations. Also, the basic design of the pull station provides for its resetting without requiring a cover of the pull station to be open. As part of the optional modules, the pull station may be configured to provide both local and general alarm signals, with the general alarm signal capable of being activated only by authorized personnel.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: June 2, 1998
    Assignee: Harrington Signal Incorporated
    Inventors: Myron F. Pavlacka, Robert L. Rankin
  • Patent number: 5748072
    Abstract: An apparatus for protecting house or building from fire in neighborhood or area close by is described. When fire detecting system 16 detects a fire at a position close to house 14, computer 20 will send instruction to motor 18 and motor 18 will unfold foldable fire protecting cover 10, 12 to isolate house 14 from outside. At the same time, computer 20 will automatically send a fire alarm to the fire station and a specific phone such as work phone of householder through modem 22. Since fire protecting cover 10, 12 isolates the house from the fire outside, therefore house 14 can be effectively protected. Fire protecting cover 12 also can be remotely controlled by the householder through a telephone 24.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: May 5, 1998
    Inventor: Hui Wang
  • Patent number: 5654684
    Abstract: The system includes a sensor for each junction box in the building to be guarded, i.e., the residence, and a display panel showing the temperature of any junction box that is heated above the danger point. Another display panel shows the name of the resident and address of the residence, and the location of the heated junction box by room number and junction box number and the shape of the junction box. A plurality of residences are connected with a central station, such as a fire station, by single telephone line to each residence. A single processing unit is located in each residence, and a single such unit in the central display station. A display panel is located in the central station identical with each display in a residence.
    Type: Grant
    Filed: May 26, 1994
    Date of Patent: August 5, 1997
    Assignee: David Boyden
    Inventor: David Boyden
  • Patent number: 4453155
    Abstract: The water dispensing system includes sprinkler heads mounted on risers extending through the roof surface and supplied by PVC pipe suspended beneath the roof surface. Alternatively, porous hose may be mounted along the ridges. Water is supplied through an electrically motorized valve and electric motor driven booster pumps. The control circuit includes one or more flame sensor circuits each consisting of an electric current conductor disposed in selectively spaced runs and connected to the coil of a signal relay. Smoke detector sensor circuits include relay switches and operating coils, which coils are activated in response to a selected smoke level. The relay switches are connected by the control circuit to energize the motorized valve and the pump motor. The water flow is initiated either when flame overtakes a run of a flame sensor conductor or when a smoke detector detects the selected smoke level.
    Type: Grant
    Filed: December 23, 1981
    Date of Patent: June 5, 1984
    Assignee: Raincloud, Inc.
    Inventor: Gary D. Cooper
  • Patent number: 4168748
    Abstract: A method and apparatus for instantaneous response, evacuation and control of a fire in a conventional multi-story building, having substantial side wall portions formed of glass or brick. A suspendable and/or connectable personnel platform is provided with telescoping fire suppressant nozzles adapted for coupling to a fire suppressant supply system constructed in the corners and/or side walls of a building. A computerized control network facilitates fire detection and remote actuation of the system and positioning of the platform at the necessary building level. The platform includes a cage for the protection of the evacuees of the particular floor of the building being serviced. In addition, the platform includes a horizontal supply line which couples to the building fire suppressant supply system for permitting the telescoping nozzles to spray the subject combustion.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: September 25, 1979
    Inventor: Christopher L. Batte
  • Patent number: 4162485
    Abstract: A multi-zone fire protection system in which each protected zone is provided with a detector for producing an alarm signal in response to the presence of combustion products, a source of fire extinguishing agent, and a pull box station manually operable to induce discharge of the extinguishing agent into the protected zone. Each pull station possesses a signal lamp that can be energized to signal an abnormal condition to personnel present in the area. A signal lamp in a given zone is energized via a central control panel in response to an alarm signal from a detector associated with that zone, thereby clearly indicating to personnel at hand the specific zone in which a fire has been detected.
    Type: Grant
    Filed: January 7, 1977
    Date of Patent: July 24, 1979
    Assignee: Walter Kidde and Company, Inc.
    Inventors: Enio Facchini, Carl I. Swanson
  • Patent number: 4017844
    Abstract: A multi-zone fire protection system in which each protected zone is provided with a detector for producing an alarm signal in response to the presence of combustion products, a source of fire extinguishing agent, and a pull box station manually operable to induce discharge of the extinguishing agent into the protected zone. Each pull station possesses a signal lamp that can be energized to signal an abnormal condition to personnel present in the area. A signal lamp in a given zone is energized via a central control panel in response to an alarm signal from a detector associated with that zone, thereby clearly indicating to personnel at hand the specific zone in which a fire has been detected.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: April 12, 1977
    Assignee: Walter Kidde & Company, Inc.
    Inventors: Enio Facchini, Carl I. Swanson