TREA

Hikaru Takematsu

Follow

Person

  • Higashikurume, JP
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Control signal transmission system for key telephone system
    • Patent number 4,551,583
    • Issue date Nov 5, 1985
    • Telegraph & Telephone Pub. Corp.
    • Koichi Sekiguchi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Channel switching network
    • Patent number 4,353,066
    • Issue date Oct 5, 1982
    • Iwasaki Tsushinki Kabushiki Kaisha
    • Tetsuro Inomata
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Key telephone systems
    • Patent number 4,280,022
    • Issue date Jul 21, 1981
    • Iwasaki Tsushinki Kabushiki Kaisha
    • Koichi Sekiguchi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Key telephone system
    • Patent number 4,234,765
    • Issue date Nov 18, 1980
    • Iwasaki Tsushinki Kabushiki Kaisha
    • Kouichi Sekiguchi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE