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Helena Ljusberg-Wahren

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  • Soderhamn, SE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Coal-water dispersion agent
    • Patent number 4,957,511
    • Issue date Sep 18, 1990
    • Bergvik Kemi AB
    • Helena Ljusberg-Wahren
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Coal-water dispersion
    • Patent number 4,634,450
    • Issue date Jan 6, 1987
    • Bergvik Kemi AB
    • Helena Ljusberg-Wahren
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL