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Expired European patentEurope

Production of silicon nitride sintered body

EP 0225087 B1 · Applicant: NGK INSULATORS, 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 November 12, 1986 and granted June 24, 1992. A European patent lasts at most 20 years from filing, so its term ended November 12, 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 May 12, 2012.
  • 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.
FiledNovember 12, 1986
PublishedJune 10, 1987
GrantedJune 24, 1992
Term endedNovember 12, 2006
Application numberEP 86308828
Classification (CPC)C04B35/584 +1 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedNov 12, 1986PublishedJune 10, 1987Patent grantedJune 24, 1992Term endedNov 12, 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.