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Expired European patentEurope

Anthraquinone compound and dyeing or printing method using the same

EP 0276686 B1 · Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED

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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 January 13, 1988 and granted September 4, 1991. A European patent lasts at most 20 years from filing, so its term ended January 13, 2008.
  • 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 July 13, 2013.
  • 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.
FiledJanuary 13, 1988
PublishedAugust 3, 1988
GrantedSeptember 4, 1991
Term endedJanuary 13, 2008
Application numberEP 88100383
Classification (CPC)C09B62/505

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedJan 13, 1988PublishedAug 3, 1988Patent grantedSep 4, 1991Term endedJan 13, 2008

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.