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Ignition system

US 2,180,794 A · Inventors: CARLSON WILBUR L

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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 November 21, 1939. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 21, 1956.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJanuary 20, 1939
GrantedNovember 21, 1939
Term endedNovember 21, 1956
Application number—
Classification (CPC)—
Length6 pages

Timeline

Timeline From USPTO dates

194019421944194619481950195219541956Application filedJan 20, 1939Patent grantedNov 21, 1939Term endedNov 21, 1956

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.