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Expired European patentEurope

Manganese steels and a process of making these steels

EP 0023398 B1 · Applicant: NATIONAL RESEARCH DEVELOPMENT 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 July 9, 1980 and granted March 20, 1985. A European patent lasts at most 20 years from filing, so its term ended July 9, 2000.
  • 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 January 9, 2006.
  • 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.
FiledJuly 9, 1980
PublishedFebruary 4, 1981
GrantedMarch 20, 1985
Term endedJuly 9, 2000
Application numberEP 80302323
Classification (CPC)C22C38/04 +1 more

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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

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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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