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Expired European patentEurope

Manufacture of butanedicarboxylic acid esters

EP 0177641 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 December 11, 1984 and granted March 3, 1993. A European patent lasts at most 20 years from filing, so its term ended December 11, 2004.
  • 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 June 11, 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.
FiledDecember 11, 1984
PublishedApril 16, 1986
GrantedMarch 3, 1993
Term endedDecember 11, 2004
Application numberEP 84115023
Classification (CPC)C07C67/38 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedDec 11, 1984PublishedApril 16, 1986Patent grantedMarch 3, 1993Term endedDec 11, 2004

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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