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Expired European patentEurope

Spark plug

EP 0243529 B1 · Applicant: NGK Spark Plug Co. Ltd.

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 May 14, 1986 and granted October 24, 1990. A European patent lasts at most 20 years from filing, so its term ended May 14, 2006.
  • 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 November 14, 2011.
  • 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.
FiledMay 14, 1986
PublishedNovember 4, 1987
GrantedOctober 24, 1990
Term endedMay 14, 2006
Application numberEP 86106533
Classification (CPC)C22C5/00 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedMay 14, 1986PublishedNov 4, 1987Patent grantedOct 24, 1990Term endedMay 14, 2006

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.