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Expired European patentEurope

Heat treating method and apparatus for making rods of alloy steel ready for use

EP 0090682 B1 · Applicant: INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID)

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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 February 24, 1983 and granted April 3, 1991. A European patent lasts at most 20 years from filing, so its term ended February 24, 2003.
  • 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 August 24, 2008.
  • 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.
FiledFebruary 24, 1983
PublishedOctober 5, 1983
GrantedApril 3, 1991
Term endedFebruary 24, 2003
Application numberEP 83400378
Classification (CPC)C21D1/62 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedFeb 24, 1983PublishedOct 5, 1983Patent grantedApril 3, 1991Term endedFeb 24, 2003

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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