TREA

Koichi Fujiwara

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  • Mito, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Electric contact material and method of producing the same
    • Patent number 4,330,331
    • Issue date May 18, 1982
    • Nippon Telegraph & Telephone Public Corporation
    • Koichi Fujiwara
    • C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
  • Information Patent Grant

    Electrical contact material
    • Patent number 4,279,649
    • Issue date Jul 21, 1981
    • Nippon Telegraph & Telephone Public Corporation
    • Koichi Fujiwara
    • C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...