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Expired European patentEurope

Method for synthesizing aryl hydrazine through reduction of a diazo compound derivative

EP 0876331 B1 · Applicant: RHODIA CHIMIE

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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 December 27, 1996 and granted June 12, 2002. A European patent lasts at most 20 years from filing, so its term ended December 27, 2016.
  • 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 June 27, 2022.
  • 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.
FiledDecember 27, 1996
PublishedNovember 11, 1998
GrantedJune 12, 2002
Term endedDecember 27, 2016
Application numberEP 96944089
Classification (CPC)C07C241/02

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedDec 27, 1996PublishedNov 11, 1998Patent grantedJune 12, 2002Term endedDec 27, 2016

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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