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Expired European patentEurope

Method of forming thermionic cathodes

EP 0082965 B1 · Applicant: Alcatel SEL Aktiengesellschaft

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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 November 29, 1982 and granted March 18, 1987. A European patent lasts at most 20 years from filing, so its term ended November 29, 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 May 29, 2008.
  • 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.
FiledNovember 29, 1982
PublishedJuly 6, 1983
GrantedMarch 18, 1987
Term endedNovember 29, 2002
Application numberEP 82111027
Classification (CPC)H01J9/045

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedNov 29, 1982PublishedJuly 6, 1983Patent grantedMarch 18, 1987Term endedNov 29, 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

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