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Expired European patentEurope

Multiplex addressing of ferro-electric crystal displays

EP 0391931 B1 · Applicant: SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOV. OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND

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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 November 16, 1988 and granted March 2, 1994. A European patent lasts at most 20 years from filing, so its term ended November 16, 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 May 16, 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.
FiledNovember 16, 1988
PublishedOctober 17, 1990
GrantedMarch 2, 1994
Term endedNovember 16, 2008
Application numberEP 88909577
Classification (CPC)G09G3/3629

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedNov 16, 1988PublishedOct 17, 1990Patent grantedMarch 2, 1994Term endedNov 16, 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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