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Electron tube structure and the manufacture thereof

US 2,581,997 A · Inventors: BEGGS JAMES E

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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 January 8, 1952. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by January 8, 1969.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 12, 1945
GrantedJanuary 8, 1952
Term endedJanuary 8, 1969
Application number—
Classification (CPC)H01J21/36
Length4 pages

Timeline

Timeline From USPTO dates

19461949195219551958196119641967Application filedJuly 12, 1945Patent grantedJan 8, 1952Term endedJan 8, 1969

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.