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Centrifugal pump

US 1,664,572 A · Inventors: OSCAR POULSEN

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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 April 3, 1928. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by April 3, 1945.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMay 10, 1920
GrantedApril 3, 1928
Term endedApril 3, 1945
Application number—
Classification (CPC)F04D29/2266
Length3 pages

Timeline

Timeline From USPTO dates

192119241927193019331936193919421945Application filedMay 10, 1920Patent grantedApril 3, 1928Term endedApril 3, 1945

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

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