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Expired European patentEurope

Process for producing terephthalic acid suitable for use in direct polymerization

EP 0111784 B1 · Applicant: KURARAY YUKA CO., LTD.

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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 November 29, 1983 and granted February 5, 1986. A European patent lasts at most 20 years from filing, so its term ended November 29, 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 May 29, 2009.
  • 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.
FiledNovember 29, 1983
PublishedJune 27, 1984
GrantedFebruary 5, 1986
Term endedNovember 29, 2003
Application numberEP 83111972
Classification (CPC)C07C51/487

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedNov 29, 1983PublishedJune 27, 1984Patent grantedFeb 5, 1986Term endedNov 29, 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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