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Expired European patentEurope

Piston and process for achieving controlled ignition

EP 0458809 B1 · Applicant: SONEX RESEARCH INC.

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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 January 23, 1990 and granted October 26, 1994. A European patent lasts at most 20 years from filing, so its term ended January 23, 2010.
  • 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 July 23, 2015.
  • 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.
FiledJanuary 23, 1990
PublishedDecember 4, 1991
GrantedOctober 26, 1994
Term endedJanuary 23, 2010
Application numberEP 90902452
Classification (CPC)F02B23/00 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedJan 23, 1990PublishedDec 4, 1991Patent grantedOct 26, 1994Term endedJan 23, 2010

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.