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Expired European patentEurope

Normally white twisted nematic LCD with retardation films on opposite sides of liquid crystal material for improved viewing zone

EP 0667553 B1 · Applicant: OIS Optical Imaging Systems, Inc.

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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 December 13, 1994 and granted March 2, 2005. A European patent lasts at most 20 years from filing, so its term ended December 13, 2014.
  • 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 June 13, 2020.
  • 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.
FiledDecember 13, 1994
PublishedAugust 16, 1995
GrantedMarch 2, 2005
Term endedDecember 13, 2014
Application numberEP 94119683
Classification (CPC)G02F1/13363 +1 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedDec 13, 1994PublishedAug 16, 1995Patent grantedMarch 2, 2005Term endedDec 13, 2014

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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