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Expired European patentEurope

High-strength ceramics containing alpha-sialon

EP 0250593 B1 · Applicant: RESEARCH DEVELOPMENT CORPORATION OF JAPAN

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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 December 20, 1985 and granted September 18, 1991. A European patent lasts at most 20 years from filing, so its term ended December 20, 2005.
  • 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 June 20, 2011.
  • 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.
FiledDecember 20, 1985
PublishedJanuary 7, 1988
GrantedSeptember 18, 1991
Term endedDecember 20, 2005
Application numberEP 86900260
Classification (CPC)C04B35/597

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedDec 20, 1985PublishedJan 7, 1988Patent grantedSep 18, 1991Term endedDec 20, 2005

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.