TREA

Christopher J. Johnson

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  • Elk River, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Putting guide
    • Patent number 5,785,604
    • Issue date Jul 28, 1998
    • Christopher J. Johnson
    • A63 - SPORTS GAMES AMUSEMENTS
  • Information Patent Grant

    Putting guide
    • Patent number 5,320,355
    • Issue date Jun 14, 1994
    • Christopher J. Johnson
    • A63 - SPORTS GAMES AMUSEMENTS