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Expired European patentEurope

Process for the preparation of 3-methyl-1-vinyl-imidazolium chlorides and their use for the production of polymerizates

EP 0246580 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 May 16, 1987 and granted July 3, 1991. A European patent lasts at most 20 years from filing, so its term ended May 16, 2007.
  • 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 November 16, 2012.
  • 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.
FiledMay 16, 1987
PublishedNovember 25, 1987
GrantedJuly 3, 1991
Term endedMay 16, 2007
Application numberEP 87107116
Classification (CPC)C07D233/56 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMay 16, 1987PublishedNov 25, 1987Patent grantedJuly 3, 1991Term endedMay 16, 2007

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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