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Expired European patentEurope

A method for the optical purification of an optically active 2,2-dimethylcyclopropanecarboxylic acid amide

EP 0155779 B1 · Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED

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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 26, 1985 and granted April 26, 1989. A European patent lasts at most 20 years from filing, so its term ended February 26, 2005.
  • 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 26, 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.
FiledFebruary 26, 1985
PublishedSeptember 25, 1985
GrantedApril 26, 1989
Term endedFebruary 26, 2005
Application numberEP 85301285
Classification (CPC)C07C233/00

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedFeb 26, 1985PublishedSep 25, 1985Patent grantedApril 26, 1989Term endedFeb 26, 2005

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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