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Donald L. Heffner

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  • Miamisburg, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Vacuum check valve and method of control
    • Patent number 4,856,554
    • Issue date Aug 15, 1989
    • General Motors Corporation
    • Donald L. Heffner
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Vacuum check valve
    • Patent number 4,763,689
    • Issue date Aug 16, 1988
    • General Motors Corporation
    • Donald L. Heffner
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Vacuum check valve
    • Patent number 4,756,333
    • Issue date Jul 12, 1988
    • General Motors Corporation
    • Donald L. Heffner
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Vacuum check valve
    • Patent number 4,750,517
    • Issue date Jun 14, 1988
    • General Motors Corporation
    • Donald L. Heffner
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Vacuum check valve
    • Patent number 4,750,516
    • Issue date Jun 14, 1988
    • General Motors Corporation
    • Donald L. Heffner
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Vacuum check valve
    • Patent number 4,724,867
    • Issue date Feb 16, 1988
    • General Motors Corporation
    • William H. Gillespie
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Vacuum check valve
    • Patent number 4,628,959
    • Issue date Dec 16, 1986
    • General Motors Corporation
    • Donald L. Parker
    • B60 - VEHICLES IN GENERAL