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Expired European patentEurope

Liquid-crystal cell presenting a homeotropic structure, with birefringence compensation for this structure

EP 0162775 B1 · Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE

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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 May 10, 1985 and granted August 3, 1994. A European patent lasts at most 20 years from filing, so its term ended May 10, 2005.
  • 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 November 10, 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.
FiledMay 10, 1985
PublishedNovember 27, 1985
GrantedAugust 3, 1994
Term endedMay 10, 2005
Application numberEP 85400913
Classification (CPC)G02F1/13363

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMay 10, 1985PublishedNov 27, 1985Patent grantedAug 3, 1994Term endedMay 10, 2005

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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