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Expired European patentEurope

Method and device for checking the electrically insulating state of an electrically conducting construction

EP 0494012 B1 · Applicant: GAZ DE FRANCE

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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 20, 1991 and granted September 17, 1997. A European patent lasts at most 20 years from filing, so its term ended December 20, 2011.
  • 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 20, 2017.
  • 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 20, 1991
PublishedJuly 8, 1992
GrantedSeptember 17, 1997
Term endedDecember 20, 2011
Application numberEP 91403503
Classification (CPC)G01N17/02

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedDec 20, 1991PublishedJuly 8, 1992Patent grantedSep 17, 1997Term endedDec 20, 2011

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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