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Expired European patentEurope

Gas discharge display device

EP 0012922 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 December 10, 1979 and granted January 20, 1982. A European patent lasts at most 20 years from filing, so its term ended December 10, 1999.
  • 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 June 10, 2005.
  • 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.
FiledDecember 10, 1979
PublishedJuly 9, 1980
GrantedJanuary 20, 1982
Term endedDecember 10, 1999
Application numberEP 79105080
Classification (CPC)H01J17/498

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedDec 10, 1979PublishedJuly 9, 1980Patent grantedJan 20, 1982Term endedDec 10, 1999

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.