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Expired European patentEurope

Process to suppress surface deposits during salt bath nitriding of structural parts

EP 0077926 B1 · Applicant: Degussa Aktiengesellschaft

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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 September 25, 1982 and granted December 4, 1985. A European patent lasts at most 20 years from filing, so its term ended September 25, 2002.
  • 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 March 25, 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.
FiledSeptember 25, 1982
PublishedMay 4, 1983
GrantedDecember 4, 1985
Term endedSeptember 25, 2002
Application numberEP 82108892
Classification (CPC)C23C8/50

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedSep 25, 1982PublishedMay 4, 1983Patent grantedDec 4, 1985Term endedSep 25, 2002

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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