TREA

John W. Duffy

Follow

Person

  • Tama, IA, US
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Stabilizer for pressure regulator
    • Patent number 5,402,820
    • Issue date Apr 4, 1995
    • Fisher Controls International, Inc.
    • John W. Duffy
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Regulator valve with diaphragm support
    • Patent number 5,271,601
    • Issue date Dec 21, 1993
    • Fisher Controls International, Inc.
    • William J. Bonzer
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Travel stop for diaphragm regulator valve
    • Patent number 4,782,850
    • Issue date Nov 8, 1988
    • Fisher Controls International, Inc.
    • John W. Duffy
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Velocity boost body with wrap-around pitot tube
    • Patent number 4,754,778
    • Issue date Jul 5, 1988
    • Fisher Controls International, Inc.
    • John W. Duffy
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Control regulator having a rolling diaphragm
    • Patent number 4,624,442
    • Issue date Nov 25, 1986
    • John W. Duffy
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    High-low pressure pilot
    • Patent number 4,616,670
    • Issue date Oct 14, 1986
    • Fisher Controls International, Inc.
    • John W. Duffy
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Pilot-operated back pressure regulator
    • Patent number 4,295,489
    • Issue date Oct 20, 1981
    • Fisher Controls Company, Inc.
    • Roger R. Arends
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...