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Filament tensioning and supporting arrangements for electron tubes

US 2,728,017 A · Inventors: PAUL HAAS

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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 December 20, 1955. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 20, 1972.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMay 6, 1942
GrantedDecember 20, 1955
Term endedDecember 20, 1972
Application number—
Classification (CPC)H01J1/18
Length4 pages

Timeline

Timeline From USPTO dates

1943194619491952195519581961196419671970Application filedMay 6, 1942Patent grantedDec 20, 1955Term endedDec 20, 1972

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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