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Process of annealing and heat treating cast iron

US 1,803,340 A · Inventors: MENOUGH PAUL S

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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 5, 1931. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by May 5, 1948.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 10, 1925
GrantedMay 5, 1931
Term endedMay 5, 1948
Application number—
Classification (CPC)—
Length3 pages

Timeline

Timeline From USPTO dates

19261929193219351938194119441947Application filedNov 10, 1925Patent grantedMay 5, 1931Term endedMay 5, 1948

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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