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Expired European patentEurope

Process for opening the ring of gem-dicyanoepoxydes and compounds produced by this process

EP 0166650 B1 · Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)

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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 June 13, 1985 and granted March 16, 1988. A European patent lasts at most 20 years from filing, so its term ended June 13, 2005.
  • 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 December 13, 2010.
  • 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.
FiledJune 13, 1985
PublishedJanuary 2, 1986
GrantedMarch 16, 1988
Term endedJune 13, 2005
Application numberEP 85401168
Classification (CPC)C07D487/04 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedJune 13, 1985PublishedJan 2, 1986Patent grantedMarch 16, 1988Term endedJune 13, 2005

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.