TREA

Hansan Ma

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  • Cape Elizabeth, ME, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Ball with a passive sound device
    • Patent number 5,253,866
    • Issue date Oct 19, 1993
    • Tonka Corporation
    • Randall H. Moorman
    • A63 - SPORTS GAMES AMUSEMENTS
  • Information Patent Grant

    Curve ball
    • Patent number 4,919,422
    • Issue date Apr 24, 1990
    • Tonka Corporation
    • Hansan Ma
    • A63 - SPORTS GAMES AMUSEMENTS