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Electric heating tube in which enlarged convolutions of filament coil act as filament supports

US 3,223,875 A · Inventors: REINHOLD EGGERS

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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 14, 1965. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 14, 1982.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledDecember 15, 1959
GrantedDecember 14, 1965
Term endedDecember 14, 1982
Application number—
Classification (CPC)H05B3/0038 +2 more
Length3 pages

Timeline

Timeline From USPTO dates

19601963196619691972197519781981Application filedDec 15, 1959Patent grantedDec 14, 1965Term endedDec 14, 1982

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

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