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Expired European patentEurope

Process for the production of one or more carboxylic acid anhydrides

EP 0096974 B1 · Applicant: BP Chemicals Limited

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Overview

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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 19, 1983 and granted September 11, 1985. A European patent lasts at most 20 years from filing, so its term ended May 19, 2003.
  • 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 19, 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.
FiledMay 19, 1983
PublishedDecember 28, 1983
GrantedSeptember 11, 1985
Term endedMay 19, 2003
Application numberEP 83302846
Classification (CPC)C07C51/54

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMay 19, 1983PublishedDec 28, 1983Patent grantedSep 11, 1985Term endedMay 19, 2003

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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