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Expired European patentEurope

Piston ring for combustion engine

EP 0764801 B1 · Applicant: Wärtsilä Schweiz AG

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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 September 19, 1995 and granted February 26, 2003. A European patent lasts at most 20 years from filing, so its term ended September 19, 2015.
  • 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 March 19, 2021.
  • 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.
FiledSeptember 19, 1995
PublishedMarch 26, 1997
GrantedFebruary 26, 2003
Term endedSeptember 19, 2015
Application numberEP 95810583
Classification (CPC)F16J9/26

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedSep 19, 1995PublishedMarch 26, 1997Patent grantedFeb 26, 2003Term endedSep 19, 2015

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.