Patent Yard Sign in
Expired European patentEurope

A spark plug

EP 0341807 B1 · Applicant: NGK SPARK PLUG CO., LTD

EPO PDF

Overview

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

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed February 24, 1989 and granted September 15, 1993. A European patent lasts at most 20 years from filing, so its term ended February 24, 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 August 24, 2014.
  • 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.
FiledFebruary 24, 1989
PublishedNovember 15, 1989
GrantedSeptember 15, 1993
Term endedFebruary 24, 2009
Application numberEP 89301867
Classification (CPC)H01T13/04

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedFeb 24, 1989PublishedNov 15, 1989Patent grantedSep 15, 1993Term endedFeb 24, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.