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Dirk Zylstra

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  • Ionia, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Portable neck exercise device
    • Patent number 8,840,528
    • Issue date Sep 23, 2014
    • Dirk Zylstra
    • A63 - SPORTS GAMES AMUSEMENTS
  • Information Patent Grant

    Neck exercise machine
    • Patent number 7,468,019
    • Issue date Dec 23, 2008
    • Dirk Zylstra
    • A63 - SPORTS GAMES AMUSEMENTS

Patents Applicationslast 30 patents

  • Information Patent Application

    Portable Neck Exercise Device
    • Publication number 20140221176
    • Publication date Aug 7, 2014
    • Dirk Zylstra
    • A63 - SPORTS GAMES AMUSEMENTS
  • Information Patent Application

    Neck exercise machine
    • Publication number 20080119331
    • Publication date May 22, 2008
    • Dirk Zylstra
    • A63 - SPORTS GAMES AMUSEMENTS