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Expired European patentEurope

High strength high oxidation-resistance sialon sintered body

EP 0344642 B1 · Applicant: NKK CORPORATION

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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 May 26, 1989 and granted October 27, 1993. A European patent lasts at most 20 years from filing, so its term ended May 26, 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 November 26, 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.
FiledMay 26, 1989
PublishedDecember 6, 1989
GrantedOctober 27, 1993
Term endedMay 26, 2009
Application numberEP 89109541
Classification (CPC)C04B35/597

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedMay 26, 1989PublishedDec 6, 1989Patent grantedOct 27, 1993Term endedMay 26, 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

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