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Yoshifumi Yamakawa

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  • Kanagawa, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Display device
    • Patent number 6,778,182
    • Issue date Aug 17, 2004
    • Sony Corporation
    • Yoshifumi Yamakawa
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Display device
    • Patent number 6,654,028
    • Issue date Nov 25, 2003
    • Sony Corporation
    • Yoshifumi Yamakawa
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Clear blue circuit for use with computer monitors and the like
    • Patent number 6,069,612
    • Issue date May 30, 2000
    • Sony Corporation
    • Yoshifumi Yamakawa
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Brightness and contrast adjusting apparatus
    • Patent number 4,682,231
    • Issue date Jul 21, 1987
    • Sony Corporation
    • Yoshifumi Yamakawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

  • Information Patent Application

    Display device
    • Publication number 20020033830
    • Publication date Mar 21, 2002
    • Yoshifumi Yamakawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE