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Expired European patentEurope

Arrangement for determining the contrast of a display screen with regard to the direction of observation

EP 0286529 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 April 5, 1988 and granted July 1, 1992. A European patent lasts at most 20 years from filing, so its term ended April 5, 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 October 5, 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.
FiledApril 5, 1988
PublishedOctober 12, 1988
GrantedJuly 1, 1992
Term endedApril 5, 2008
Application numberEP 88400815
Classification (CPC)G02F1/1309

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedApril 5, 1988PublishedOct 12, 1988Patent grantedJuly 1, 1992Term endedApril 5, 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

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