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Shigeyuki Kawana

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    IC card system for preventing unauthorized data alteration
    • Patent number 5,010,237
    • Issue date Apr 23, 1991
    • Casio Computer Co., Ltd.
    • Shigeyuki Kawana
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    IC card
    • Patent number 4,845,351
    • Issue date Jul 4, 1989
    • Casio Computer Co., Ltd.
    • Kazuya Hara
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    IC card system
    • Patent number 4,794,236
    • Issue date Dec 27, 1988
    • Casio Computer Co., Ltd.
    • Shigeyuki Kawana
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    IC card
    • Patent number 4,780,602
    • Issue date Oct 25, 1988
    • Casio Computer Co., Ltd.
    • Shigeyuki Kawana
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Identification system for authenticating both IC card and terminal
    • Patent number 4,746,788
    • Issue date May 24, 1988
    • Casio Computer Co., Ltd.
    • Shigeyuki Kawana
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    IC card
    • Patent number 4,734,569
    • Issue date Mar 29, 1988
    • Casio Computer Co., Ltd.
    • Shigeyuki Kawana
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Identification card and authentication system therefor
    • Patent number 4,697,072
    • Issue date Sep 29, 1987
    • Casio Computer Co., Ltd.
    • Shigeyuki Kawana
    • G06 - COMPUTING CALCULATING COUNTING