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Expired European patentEurope

Liquid crystal display

EP 0168423 B1 · Applicant: POLAROID CORPORATION

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 13, 1984 and granted November 2, 1989. A European patent lasts at most 20 years from filing, so its term ended December 13, 2004.
  • 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 13, 2010.
  • 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 13, 1984
PublishedJanuary 22, 1986
GrantedNovember 2, 1989
Term endedDecember 13, 2004
Application numberEP 85900413
Classification (CPC)G02F1/1335 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedDec 13, 1984PublishedJan 22, 1986Patent grantedNov 2, 1989Term endedDec 13, 2004

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.