TREA

Gerrit G. DeHaas

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  • Longview, WA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Spent liquor treatment
    • Patent number 4,135,968
    • Issue date Jan 23, 1979
    • Weyerhaeuser Company
    • Gerrit G. Dehaas
    • D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
  • Information Patent Grant

    Ammonia-ketone pulping process
    • Patent number 3,951,734
    • Issue date Apr 20, 1976
    • Weyerhaeuser Company
    • Gerrit G. DeHaas
    • D21 - PAPER-MAKING PRODUCTION OF CELLULOSE