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Expired European patentEurope

Method of refining of high purity steel

EP 0548868 B1 · Applicant: KAWASAKI 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 21, 1992 and granted September 16, 1998. A European patent lasts at most 20 years from filing, so its term ended December 21, 2012.
  • 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 21, 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.
FiledDecember 21, 1992
PublishedJune 30, 1993
GrantedSeptember 16, 1998
Term endedDecember 21, 2012
Application numberEP 92121682
Classification (CPC)C21C7/10

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedDec 21, 1992PublishedJune 30, 1993Patent grantedSep 16, 1998Term endedDec 21, 2012

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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