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Expired European patentEurope

Silicon nitride powder and method for its manufacture

EP 0554020 B1 · Applicant: SUMITOMO ELECTRIC INDUSTRIES, LIMITED

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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 January 22, 1993 and granted April 9, 1997. A European patent lasts at most 20 years from filing, so its term ended January 22, 2013.
  • 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 July 22, 2018.
  • 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.
FiledJanuary 22, 1993
PublishedAugust 4, 1993
GrantedApril 9, 1997
Term endedJanuary 22, 2013
Application numberEP 93300485
Classification (CPC)C01B21/0687 +1 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedJan 22, 1993PublishedAug 4, 1993Patent grantedApril 9, 1997Term endedJan 22, 2013

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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