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Expired European patentEurope

Method of driving ferroelectric liquid crystal element and ferroelectric liquid crystal display

EP 0448032 B1 · Applicant: CANON KABUSHIKI KAISHA

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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 March 19, 1991 and granted July 3, 1996. A European patent lasts at most 20 years from filing, so its term ended March 19, 2011.
  • 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 September 19, 2016.
  • 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.
FiledMarch 19, 1991
PublishedSeptember 25, 1991
GrantedJuly 3, 1996
Term endedMarch 19, 2011
Application numberEP 91104222
Classification (CPC)G09G3/367 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 19, 1991PublishedSep 25, 1991Patent grantedJuly 3, 1996Term endedMarch 19, 2011

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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