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Expired European patentEurope

Method for the preparation of stilbene dicarbonitriles

EP 0123906 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 March 28, 1984 and granted May 6, 1987. A European patent lasts at most 20 years from filing, so its term ended March 28, 2004.
  • 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 September 28, 2009.
  • 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.
FiledMarch 28, 1984
PublishedNovember 7, 1984
GrantedMay 6, 1987
Term endedMarch 28, 2004
Application numberEP 84103401
Classification (CPC)C07C255/00

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 28, 1984PublishedNov 7, 1984Patent grantedMay 6, 1987Term endedMarch 28, 2004

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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