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Expired, full termArchiveSolo inventor

Spark gap for use more particularly in high-frequency ignition systems for internal-combustion engines

US 2,397,764 A · Inventors: GEORGE STUBBS HAROLD VIVIAN

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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 2, 1946. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by April 2, 1963.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJune 1, 1942
GrantedApril 2, 1946
Term endedApril 2, 1963
Application number—
Classification (CPC)H01T1/00
Length5 pages

Timeline

Timeline From USPTO dates

1943194619491952195519581961Application filedJune 1, 1942Patent grantedApril 2, 1946Term endedApril 2, 1963

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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

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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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