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Kenji Yamamoto

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  • Yao, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pressure-and-heat-sensitive copying paper
    • Patent number RE31412
    • Issue date Oct 11, 1983
    • Yamamoto Kagaku Gosei Kabushiki Kaisha
    • Yoshihiro Hatano
    • 428 - Stock material or miscellaneous articles
  • Information Patent Grant

    Recording material
    • Patent number 4,330,473
    • Issue date May 18, 1982
    • Yamamoto Kagaku Gosei Kabushiki Kaisha
    • Yoshihiro Hatano
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
  • Information Patent Grant

    Pen type electronic digital calculator
    • Patent number 4,128,889
    • Issue date Dec 5, 1978
    • Hoshidenki-Seizo Kabushiki Kaisha
    • Shin Ojima
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES