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Expired European patentEurope

A spark plug structure

EP 0377938 B1 · Applicant: NGK SPARK PLUG CO., LTD

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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 August 18, 1989 and granted October 11, 1995. A European patent lasts at most 20 years from filing, so its term ended August 18, 2009.
  • 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 February 18, 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.
FiledAugust 18, 1989
PublishedJuly 18, 1990
GrantedOctober 11, 1995
Term endedAugust 18, 2009
Application numberEP 89308389
Classification (CPC)H01T13/32 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedAug 18, 1989PublishedJuly 18, 1990Patent grantedOct 11, 1995Term endedAug 18, 2009

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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