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Apparatus for producing and feeding paper pulp

US 1,668,141 A · Inventors: SWAN CLARKE RALPH

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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 May 1, 1928. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by May 1, 1945.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledOctober 12, 1922
GrantedMay 1, 1928
Term endedMay 1, 1945
Application number—
Classification (CPC)D21F1/00
Length6 pages

Timeline

Timeline From USPTO dates

19231926192919321935193819411944Application filedOct 12, 1922Patent grantedMay 1, 1928Term endedMay 1, 1945

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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

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