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Methods of improving the yield in alkaline digestion of cellulosic material

US 3,042,575 A · Inventors: CHRISTOFFER HARTLER NILS JOSEF

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Why it's free to use

  • Granted July 3, 1962. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by July 3, 1979.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 16, 1959
GrantedJuly 3, 1962
Term endedJuly 3, 1979
Application number—
Classification (CPC)D21C3/222
Length2 pages

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Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

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