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Expired European patentEurope

Hydroxyquinolone-monoazo dyes, their preparation and use

EP 0752452 B1 · Applicant: DyStar Japan Ltd.

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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 June 28, 1996 and granted September 12, 2001. A European patent lasts at most 20 years from filing, so its term ended June 28, 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 December 28, 2021.
  • 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.
FiledJune 28, 1996
PublishedJanuary 8, 1997
GrantedSeptember 12, 2001
Term endedJune 28, 2016
Application numberEP 96110473
Classification (CPC)C09B29/0088 +1 more

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedJune 28, 1996PublishedJan 8, 1997Patent grantedSep 12, 2001Term endedJune 28, 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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