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Liquid crystal devices comprising a multitude of domains having different threshold voltages for switching liquid crystals

EP 0831358 B1 · Applicant: SONY CORPORATION

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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 October 22, 1993 and granted February 4, 2004. A European patent lasts at most 20 years from filing, so its term ended October 22, 2013.
  • 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 April 22, 2019.
  • 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.
FiledOctober 22, 1993
PublishedMarch 25, 1998
GrantedFebruary 4, 2004
Term endedOctober 22, 2013
Application numberEP 97120504
Classification (CPC)G02F1/141 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedOct 22, 1993PublishedMarch 25, 1998Patent grantedFeb 4, 2004Term endedOct 22, 2013

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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