Patents by Inventor John Michael Walmsley Lawrence

John Michael Walmsley Lawrence has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cell for protecting a stripped end of a cable with sealant
    Patent number: 6739906
    Abstract: A housing (2, 4) for protecting an electrical cable (18) having a sheath and at least one core (20a, 20b) comprises a cell (8) for containing the stripped end of the sheath, an open cylinder (7) containing a sealant and a plunger (6) for forcing the sealant into the cell so as to seal the end of the sheath.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: May 25, 2004
    Assignee: JTL Systems Limited
    Inventors: John Michael Walmsley Lawrence, Andrew Francis McCaffrey
  • Defrost control method and apparatus
    Patent number: 6718778
    Abstract: A defrost control system detects the variation in flow rate of refrigerant through an evaporator 8 while the flow is regulated to achieve a desired level of superheat at the outlet of the evaporator 8. When the flow rate becomes unstable, defrosting of the evaporator 8 is triggered.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: April 13, 2004
    Assignee: JTL Systems Limited
    Inventor: John Michael Walmsley Lawrence
  • Defrost control method and apparatus
    Publication number: 20020148240
    Abstract: A defrost control system detects the variation in flow rate of refrigerant through an evaporator 8 while the flow is regulated to achieve a desired level of superheat at the outlet of the evaporator 8. When the flow rate becomes unstable, defrosting of the evaporator 8 is triggered.
    Type: Application
    Filed: January 15, 2002
    Publication date: October 17, 2002
    Inventor: John Michael Walmsley Lawrence
  • Protective cable housing
    Publication number: 20020139558
    Abstract: A housing (2, 4) for protecting an electrical cable (18) having a sheath and at least one core (20a, 20b) comprises a cell (8) for containing the stripped end of the sheath, an open cylinder (7) containing a sealant and a plunger (6) for forcing the sealant into the cell so as to seal the end of the sheath.
    Type: Application
    Filed: March 28, 2002
    Publication date: October 3, 2002
    Inventors: John Michael Walmsley Lawrence, Andrew Francis McCaffrey
  • Liquid-sensing apparatus and method
    Patent number: 5691466
    Abstract: A device for detecting the presence of liquid in a flow of gas has a heated temperature sensor mounted on a heated member in thermal contact with the gas and an unheated temperature sensor in thermal contact with the gas, but thermally isolated from the heated temperature sensor. Liquid in the gas flow evaporates by absorbing heat from the heated member and therefore reduces the temperature of the heated temperature sensor. The reduction in temperature is used to detect the presence of liquid. The device is suitable for detecting liquid at the output of an evaporator in a heat transfer system, and may be used as part of a control system which reduces the flow of refrigerant through the evaporator when liquid is detected at the output, so avoiding damage caused by liquid entering the compressor of the heat transfer system.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: November 25, 1997
    Assignee: J.T.L. Systems Ltd.
    Inventors: John Michael Walmsley Lawrence, John Frederick Harkness