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Expired European patentEurope

A self-reinforced silicon nitride ceramic body and a method of preparing the same

EP 0471568 B1 · Applicant: THE DOW CHEMICAL COMPANY

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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 14, 1991 and granted August 30, 1995. A European patent lasts at most 20 years from filing, so its term ended August 14, 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 February 14, 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.
FiledAugust 14, 1991
PublishedFebruary 19, 1992
GrantedAugust 30, 1995
Term endedAugust 14, 2011
Application numberEP 91307507
Classification (CPC)C04B35/645 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedAug 14, 1991PublishedFeb 19, 1992Patent grantedAug 30, 1995Term endedAug 14, 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

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