TREA

Edward Holtgraver

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  • Tomball, TX, US
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Patents Grantslast 30 patents

Patents Applicationslast 30 patents

  • Information Patent Application

    Line Break Device
    • Publication number 20250020233
    • Publication date Jan 16, 2025
    • QTRCO, Inc.
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Pipeline Actuation System
    • Publication number 20250020234
    • Publication date Jan 16, 2025
    • QTRCO, Inc.
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Rotary Valve Lockout Apparatus
    • Publication number 20230213114
    • Publication date Jul 6, 2023
    • QTRCO, Inc.
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Actuator Assembly for Conducting Partial Stroke Testing
    • Publication number 20220299132
    • Publication date Sep 22, 2022
    • QTRCO, Inc.
    • Edward G. Holtgraver
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Application

    System for Determining Safety Margin of an Installed Driven Member
    • Publication number 20180135665
    • Publication date May 17, 2018
    • QTRCO, Inc.
    • Edward G. Holtgraver
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Application

    Actuator Assembly for Conducting Partial Stroke Testing
    • Publication number 20170314584
    • Publication date Nov 2, 2017
    • QTRCO, Inc.
    • Edward G. Holtgraver
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Application

    Seal Assembly for Use in Harsh Environments
    • Publication number 20130333554
    • Publication date Dec 19, 2013
    • Edward Holtgraver
    • Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC