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Expired European patentEurope

Circuit for shaping the signal produced by a contact

EP 0274035 B1 · Applicant: Eta SA Fabriques d'Ebauches

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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 November 21, 1987 and granted January 23, 1991. A European patent lasts at most 20 years from filing, so its term ended November 21, 2007.
  • 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 21, 2013.
  • 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 21, 1987
PublishedJuly 13, 1988
GrantedJanuary 23, 1991
Term endedNovember 21, 2007
Application numberEP 87117190
Classification (CPC)G04G5/005 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedNov 21, 1987PublishedJuly 13, 1988Patent grantedJan 23, 1991Term endedNov 21, 2007

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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