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Expired European patentEurope

Method for the purification of pyrethroid intermediate compounds by selective partial saponification

EP 0034875 B1 · Applicant: STAUFFER CHEMICAL COMPANY

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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 24, 1981 and granted July 27, 1983. A European patent lasts at most 20 years from filing, so its term ended February 24, 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 August 24, 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.
FiledFebruary 24, 1981
PublishedSeptember 2, 1981
GrantedJuly 27, 1983
Term endedFebruary 24, 2001
Application numberEP 81200230
Classification (CPC)C07C67/60

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedFeb 24, 1981PublishedSep 2, 1981Patent grantedJuly 27, 1983Term endedFeb 24, 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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