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Takashi Tsubota

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Photoelectric conversion element evaluation apparatus
    • Patent number 10,298,174
    • Issue date May 21, 2019
    • Yokogawa Electric Corporation
    • Akishige Ito
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Inspection apparatus using polarized lights
    • Patent number 9,541,493
    • Issue date Jan 10, 2017
    • Yokogawa Electric Corporation
    • Yoshinori Matsumoto
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Semiconductor laser and light source
    • Patent number 6,226,309
    • Issue date May 1, 2001
    • Oki Electric Industry Co., Ltd.
    • Takashi Tsubota
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Opto-semiconductor device and method of fabrication of the same
    • Patent number 5,067,809
    • Issue date Nov 26, 1991
    • Oki Electric Industry Co., Ltd.
    • Takashi Tsubota
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Laser diode
    • Patent number 5,048,039
    • Issue date Sep 10, 1991
    • Oki Electric Industry Co., Ltd.
    • Takashi Tsubota
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Superluminescent diode
    • Patent number 5,034,955
    • Issue date Jul 23, 1991
    • Oki Electric Industry Co., Ltd.
    • Yasumasa Kashima
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Light-emitting diode
    • Patent number 4,975,752
    • Issue date Dec 4, 1990
    • Oki Electric Industry Co., Ltd.
    • Yasumasa Kashima
    • H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents