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Expired European patentEurope

Cysteine derivatives and process for their preparation

EP 0051682 B1 · Applicant: MITSUBISHI KASEI CORPORATION

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Overview

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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 11, 1981 and granted September 5, 1984. A European patent lasts at most 20 years from filing, so its term ended May 11, 2001.
  • 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 11, 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.
FiledMay 11, 1981
PublishedMay 19, 1982
GrantedSeptember 5, 1984
Term endedMay 11, 2001
Application numberEP 81901205
Classification (CPC)C07D295/185 +1 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedMay 11, 1981PublishedMay 19, 1982Patent grantedSep 5, 1984Term endedMay 11, 2001

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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