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Expired European patentEurope

Gas discharge switch

EP 0337192 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 March 29, 1989 and granted July 20, 1994. A European patent lasts at most 20 years from filing, so its term ended March 29, 2009.
  • 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 September 29, 2014.
  • 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.
FiledMarch 29, 1989
PublishedOctober 18, 1989
GrantedJuly 20, 1994
Term endedMarch 29, 2009
Application numberEP 89105562
Classification (CPC)H01J17/44

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedMarch 29, 1989PublishedOct 18, 1989Patent grantedJuly 20, 1994Term endedMarch 29, 2009

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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