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Method for production of high brightness high strength wood pulps

US 3,020,197 A · Inventors: JOHN SCHUBER

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Granted February 6, 1962. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by February 6, 1979.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledAugust 5, 1960
GrantedFebruary 6, 1962
Term endedFebruary 6, 1979
Application number—
Classification (CPC)D21C9/1057
Length6 pages

Timeline

Timeline From USPTO dates

1961196319651967196919711973197519771979Application filedAug 5, 1960Patent grantedFeb 6, 1962Term endedFeb 6, 1979

Sources & verification

Official USPTO records

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

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

Everything on this page comes from the USPTO record linked above.