TREA

Edward George Holtgraver

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  • Spring, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Actuator assembly for conducting partial stroke testing
    • Patent number 12,146,589
    • Issue date Nov 19, 2024
    • Edward G. Holtgraver
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Rotary valve lockout apparatus
    • Patent number 11,879,564
    • Issue date Jan 23, 2024
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Flat yoke valve actuator
    • Patent number 8,863,596
    • Issue date Oct 21, 2014
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Flat yoke valve actuator
    • Patent number 8,087,316
    • Issue date Jan 3, 2012
    • Edward George Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Pneumatic actuator with rack and pinion assembly
    • Patent number 5,492,050
    • Issue date Feb 20, 1996
    • Edward G. Holtgraver
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
  • Information Patent Grant

    Rotary valve actuator
    • Patent number 5,386,761
    • Issue date Feb 7, 1995
    • Savings by Design, Inc.
    • Edward G. Holtgraver
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Fugitive emission sealing assembly
    • Patent number 5,244,183
    • Issue date Sep 14, 1993
    • Keystone International Holdings Corp.
    • Douglas G. Calvin
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Apparatus for connecting a valve element to a valve stem
    • Patent number 4,711,427
    • Issue date Dec 8, 1987
    • Keystone International, Inc.
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Positioning assembly for use with rotatable valves
    • Patent number 4,570,901
    • Issue date Feb 18, 1986
    • Keystone International, Inc.
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Valve seat
    • Patent number 4,410,163
    • Issue date Oct 18, 1983
    • Keystone International, Inc.
    • William B. Scobie
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Valve assembly
    • Patent number 4,399,833
    • Issue date Aug 23, 1983
    • Keystone International, Inc.
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

  • Information Patent Application

    Double-Offset Butterfly Valve
    • Publication number 20150362078
    • Publication date Dec 17, 2015
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Flat Yoke Valve Actuator
    • Publication number 20120096962
    • Publication date Apr 26, 2012
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Flat yoke valve actuator
    • Publication number 20080202263
    • Publication date Aug 28, 2008
    • Edward George Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...