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Holger Franz

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  • BALTMANNSWEILER, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Oil control ring for pistons of internal combustion engines
    • Patent number 7,306,234
    • Issue date Dec 11, 2007
    • Mahle GmbH
    • Holger Franz
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Built-up piston
    • Patent number 6,223,710
    • Issue date May 1, 2001
    • Mahle GmbH
    • Holger Franz
    • F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS

Patents Applicationslast 30 patents