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Expired European patentEurope

Method of operation of exhaust-gas treatment system of sealed type converter under abnormal conditions

EP 0227858 B1 · Applicant: NIPPON STEEL CORPORATION

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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 30, 1985 and granted September 21, 1988. A European patent lasts at most 20 years from filing, so its term ended December 30, 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 30, 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 30, 1985
PublishedJuly 8, 1987
GrantedSeptember 21, 1988
Term endedDecember 30, 2005
Application numberEP 85116659
Classification (CPC)C21C5/40

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedDec 30, 1985PublishedJuly 8, 1987Patent grantedSep 21, 1988Term endedDec 30, 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

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