TREA

Keiichi Matsushima

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  • Yokohama, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Cordless digitizer
    • Patent number 5,691,511
    • Issue date Nov 25, 1997
    • Graphtec Corporation
    • Keiichi Matsushima
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Digitizer and position determination method therefor
    • Patent number 5,670,754
    • Issue date Sep 23, 1997
    • Graphtec Corp.
    • Keiichi Matsushima
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Tablet position digitizer
    • Patent number 5,414,226
    • Issue date May 9, 1995
    • Graphtec Corp.
    • Keiichi Matsushima
    • G06 - COMPUTING CALCULATING COUNTING