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Expired European patentEurope

Process for preparing oxalic acid diesters

EP 0056993 B1 · Applicant: UBE INDUSTRIES, 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 January 22, 1982 and granted December 27, 1984. A European patent lasts at most 20 years from filing, so its term ended January 22, 2002.
  • 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 July 22, 2007.
  • 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.
FiledJanuary 22, 1982
PublishedAugust 4, 1982
GrantedDecember 27, 1984
Term endedJanuary 22, 2002
Application numberEP 82100446
Classification (CPC)C07C69/36

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedJan 22, 1982PublishedAug 4, 1982Patent grantedDec 27, 1984Term endedJan 22, 2002

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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