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Ignition system for internal-combustion engines

US 1,351,396 A · Inventors: HENRY MIDGLEY ALBERT

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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 August 31, 1920. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by August 31, 1937.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledFebruary 6, 1919
GrantedAugust 31, 1920
Term endedAugust 31, 1937
Application number—
Classification (CPC)—
Length3 pages

Timeline

Timeline From USPTO dates

192019221924192619281930193219341936Application filedFeb 6, 1919Patent grantedAug 31, 1920Term endedAug 31, 1937

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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