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Expired European patentEurope

A method of addressing a ferroelectric liquid crystal display

EP 0306203 B1 · Applicant: NORTHERN TELECOM LIMITED

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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 August 23, 1988 and granted May 18, 1994. A European patent lasts at most 20 years from filing, so its term ended August 23, 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 February 23, 2014.
  • 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.
FiledAugust 23, 1988
PublishedMarch 8, 1989
GrantedMay 18, 1994
Term endedAugust 23, 2008
Application numberEP 88307804
Classification (CPC)G09G3/3629

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedAug 23, 1988PublishedMarch 8, 1989Patent grantedMay 18, 1994Term endedAug 23, 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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