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Expired European patentEurope

Substituted anthracene-type isotropic dyes for liquid crystal display devices

EP 0116218 B1 · Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY

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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 December 14, 1983 and granted July 20, 1988. A European patent lasts at most 20 years from filing, so its term ended December 14, 2003.
  • 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 June 14, 2009.
  • 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.
FiledDecember 14, 1983
PublishedAugust 22, 1984
GrantedJuly 20, 1988
Term endedDecember 14, 2003
Application numberEP 83307610
Classification (CPC)C09K19/60

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedDec 14, 1983PublishedAug 22, 1984Patent grantedJuly 20, 1988Term endedDec 14, 2003

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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