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Expired European patentEurope

Blue diketopyrrolopyrrole pigments

EP 0755933 B1 · Applicant: Ciba Specialty Chemicals Holding Inc.

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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 13, 1996 and granted March 27, 2002. A European patent lasts at most 20 years from filing, so its term ended June 13, 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 13, 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 13, 1996
PublishedJanuary 29, 1997
GrantedMarch 27, 2002
Term endedJune 13, 2016
Application numberEP 96810391
Classification (CPC)C09B57/004 +2 more

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedJune 13, 1996PublishedJan 29, 1997Patent grantedMarch 27, 2002Term endedJune 13, 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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