TREA

Tomoko Sakiyama

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  • Chicago, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Sign language telephone device
    • Patent number 6,477,239
    • Issue date Nov 5, 2002
    • Hitachi, Ltd.
    • Masaru Ohki
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Chronological telephone system
    • Patent number 6,181,778
    • Issue date Jan 30, 2001
    • Hitachi, Ltd.
    • Masaru Ohki
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS