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Expired European patentEurope

Process for the preparation of imidazoles

EP 0025191 B1 · Applicant: BASF Aktiengesellschaft

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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 28, 1980 and granted May 25, 1983. A European patent lasts at most 20 years from filing, so its term ended August 28, 2000.
  • 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 28, 2006.
  • 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 28, 1980
PublishedMarch 18, 1981
GrantedMay 25, 1983
Term endedAugust 28, 2000
Application numberEP 80105114
Classification (CPC)C07D233/54

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedAug 28, 1980PublishedMarch 18, 1981Patent grantedMay 25, 1983Term endedAug 28, 2000

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.