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Hiroshi Yokoyama

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  • Hitachi, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of coal upgrading
    • Patent number 4,523,927
    • Issue date Jun 18, 1985
    • Hitachi, Ltd.
    • Toshio Kuge
    • C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
  • Information Patent Grant

    Upgrading method of low-rank coal
    • Patent number 4,461,627
    • Issue date Jul 24, 1984
    • Hitachi, Ltd.
    • Hiroshi Yokoyama
    • C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...