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Electric exchange system.

US 992,333 A

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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 16, 1911. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by May 16, 1928.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
Filed—
GrantedMay 16, 1911
Term endedMay 16, 1928
Application number—
Classification (CPC)—
Length28 pages

Timeline

Timeline From USPTO dates

191219141916191819201922192419261928Patent grantedMay 16, 1911Term endedMay 16, 1928

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.