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Expired European patentEurope

Constrained quenching apparatus and heat treatment apparatus

EP 0628641 B1 · Applicant: NETUREN CO., LTD.

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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 May 28, 1993 and granted February 23, 2000. A European patent lasts at most 20 years from filing, so its term ended May 28, 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 November 28, 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.
FiledMay 28, 1993
PublishedDecember 14, 1994
GrantedFebruary 23, 2000
Term endedMay 28, 2013
Application numberEP 93910413
Classification (CPC)C21D1/673

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedMay 28, 1993PublishedDec 14, 1994Patent grantedFeb 23, 2000Term endedMay 28, 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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