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Expired European patentEurope

Process for the optical resolution of racemic mixtures of alpha-naphthyl-propionic acids

EP 0143371 B1 · Applicant: Alfa Chemicals Italiana S.r.l.

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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 November 7, 1984 and granted February 24, 1988. A European patent lasts at most 20 years from filing, so its term ended November 7, 2004.
  • 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 May 7, 2010.
  • 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.
FiledNovember 7, 1984
PublishedJune 5, 1985
GrantedFebruary 24, 1988
Term endedNovember 7, 2004
Application numberEP 84113430
Classification (CPC)C07C51/06

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 7, 1984PublishedJune 5, 1985Patent grantedFeb 24, 1988Term endedNov 7, 2004

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

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