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Expired European patentEurope

A sintered ceramic body for a spark plug insulator and method of sintering the same

EP 0482897 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 October 22, 1991 and granted July 6, 1994. A European patent lasts at most 20 years from filing, so its term ended October 22, 2011.
  • 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, 2017.
  • 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, 1991
PublishedApril 29, 1992
GrantedJuly 6, 1994
Term endedOctober 22, 2011
Application numberEP 91309769
Classification (CPC)C04B35/597 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedOct 22, 1991PublishedApril 29, 1992Patent grantedJuly 6, 1994Term endedOct 22, 2011

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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