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Gerhard Duck

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  • Burscheid, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Piston ring
    • Patent number 4,973,066
    • Issue date Nov 27, 1990
    • Goetze AG
    • Gerhard Duck
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Non-circular piston rings
    • Patent number 4,957,212
    • Issue date Sep 18, 1990
    • Goetze AG
    • Gerhard Duck
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Piston ring
    • Patent number 4,355,815
    • Issue date Oct 26, 1982
    • Goetze AG
    • Gerhard Duck
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Circumferentially resilient piston ring
    • Patent number 4,139,205
    • Issue date Feb 13, 1979
    • Goetze AG
    • Gerhard Duck
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...