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US 3,191,981 A · Inventors: OSMUN DEAN W

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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 June 29, 1965. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by June 29, 1982.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJune 27, 1963
GrantedJune 29, 1965
Term endedJune 29, 1982
Application number—
Classification (CPC)E21B31/18
Length4 pages

Timeline

Timeline From USPTO dates

1964196619681970197219741976197819801982Application filedJune 27, 1963Patent grantedJune 29, 1965Term endedJune 29, 1982

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.