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Expired European patentEurope

Preparation of acetic acid by carbonylation

EP 0039652 B1 · Applicant: RHONE-POULENC CHIMIE

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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 4, 1981 and granted June 22, 1983. A European patent lasts at most 20 years from filing, so its term ended May 4, 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 4, 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 4, 1981
PublishedNovember 11, 1981
GrantedJune 22, 1983
Term endedMay 4, 2001
Application numberEP 81420066
Classification (CPC)C07C51/12

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedMay 4, 1981PublishedNov 11, 1981Patent grantedJune 22, 1983Term endedMay 4, 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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