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Expired European patentEurope

Isomer enrichment process for cyclopropane carboxylates

EP 0074792 B1 · Applicant: ICI AMERICAS INC.

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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 8, 1982 and granted November 27, 1985. A European patent lasts at most 20 years from filing, so its term ended September 8, 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 8, 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 8, 1982
PublishedMarch 23, 1983
GrantedNovember 27, 1985
Term endedSeptember 8, 2002
Application numberEP 82304711
Classification (CPC)C07C51/487

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedSep 8, 1982PublishedMarch 23, 1983Patent grantedNov 27, 1985Term endedSep 8, 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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