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Expired European patentEurope

Silencer for piston engine of on aircarft

EP 0020508 B1 · Applicant: STAUCH, Phillip Erich

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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 October 22, 1979 and granted September 8, 1982. A European patent lasts at most 20 years from filing, so its term ended October 22, 1999.
  • 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 April 22, 2005.
  • 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.
FiledOctober 22, 1979
PublishedJanuary 7, 1981
GrantedSeptember 8, 1982
Term endedOctober 22, 1999
Application numberEP 79901368
Classification (CPC)F01N13/20 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedOct 22, 1979PublishedJan 7, 1981Patent grantedSep 8, 1982Term endedOct 22, 1999

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.