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Expired European patentEurope

Azo compounds, process for their preparation and their use as dyestuffs

EP 0065211 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 May 5, 1982 and granted February 20, 1985. A European patent lasts at most 20 years from filing, so its term ended May 5, 2002.
  • 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 5, 2007.
  • 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 5, 1982
PublishedNovember 24, 1982
GrantedFebruary 20, 1985
Term endedMay 5, 2002
Application numberEP 82103860
Classification (CPC)C09B62/4413

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedMay 5, 1982PublishedNov 24, 1982Patent grantedFeb 20, 1985Term endedMay 5, 2002

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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