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Expired European patentEurope

Directly heated cathode and method of making it

EP 0056749 B1 · Applicant: THOMSON-CSF

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Overview

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed January 8, 1982 and granted October 17, 1984. A European patent lasts at most 20 years from filing, so its term ended January 8, 2002.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by July 8, 2007.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledJanuary 8, 1982
PublishedJuly 28, 1982
GrantedOctober 17, 1984
Term endedJanuary 8, 2002
Application numberEP 82400030
Classification (CPC)H01J1/14

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedJan 8, 1982PublishedJuly 28, 1982Patent grantedOct 17, 1984Term endedJan 8, 2002

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.