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Expired European patentEurope

Water-soluble pyridone azo compounds, process for their preparation and their use as dyestuffs

EP 0078024 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 October 21, 1982 and granted September 19, 1984. A European patent lasts at most 20 years from filing, so its term ended October 21, 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 April 21, 2008.
  • 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.
FiledOctober 21, 1982
PublishedMay 4, 1983
GrantedSeptember 19, 1984
Term endedOctober 21, 2002
Application numberEP 82109719
Classification (CPC)C09B62/4413 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedOct 21, 1982PublishedMay 4, 1983Patent grantedSep 19, 1984Term endedOct 21, 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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