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Expired European patentEurope

Azoxycyanobenzene derivatives

EP 0672033 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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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 November 29, 1993 and granted March 11, 1998. A European patent lasts at most 20 years from filing, so its term ended November 29, 2013.
  • 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 May 29, 2019.
  • 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.
FiledNovember 29, 1993
PublishedSeptember 20, 1995
GrantedMarch 11, 1998
Term endedNovember 29, 2013
Application numberEP 94901935
Classification (CPC)C07C291/08 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedNov 29, 1993PublishedSep 20, 1995Patent grantedMarch 11, 1998Term endedNov 29, 2013

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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