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Expired European patentEurope

Method for the preparation of butane-1,4-diol from maleic anhydride

EP 0699652 B1 · Applicant: BAYER AG

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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 August 21, 1995 and granted November 11, 1998. A European patent lasts at most 20 years from filing, so its term ended August 21, 2015.
  • 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 February 21, 2021.
  • 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.
FiledAugust 21, 1995
PublishedMarch 6, 1996
GrantedNovember 11, 1998
Term endedAugust 21, 2015
Application numberEP 95113099
Classification (CPC)C07C67/08 +2 more

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedAug 21, 1995PublishedMarch 6, 1996Patent grantedNov 11, 1998Term endedAug 21, 2015

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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