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John D. Mayhew Jr.

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  • Salem, VA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Automatic position-control valve assembly
    • Patent number 6,354,327
    • Issue date Mar 12, 2002
    • Virginia Valve Company
    • John Mayhew
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Valve position controller
    • Patent number 5,654,885
    • Issue date Aug 5, 1997
    • Virginia Valve Company Corporation
    • John Mayhew
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Electro-hydraulic valve-actuator system
    • Patent number 5,097,857
    • Issue date Mar 24, 1992
    • John Mayhew
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Pipe pressure sensor
    • Patent number 4,840,068
    • Issue date Jun 20, 1989
    • John D. Mayhew
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Throttling gasket insert for use with knife gate valve
    • Patent number 4,798,365
    • Issue date Jan 17, 1989
    • Alphabet, Inc.
    • John Mayhew
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Method of making corrosion resistant valve
    • Patent number 4,646,407
    • Issue date Mar 3, 1987
    • Alphabet Inc.
    • John D. Mayhew
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Turn disc slide valve
    • Patent number 4,587,989
    • Issue date May 13, 1986
    • John D. Mayhew
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL