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Expired European patentEurope

Switchable liquid crystal device and method of making a switchable liquid crystal device

EP 0819971 B1 · Applicant: SHARP 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 July 18, 1997 and granted October 16, 2002. A European patent lasts at most 20 years from filing, so its term ended July 18, 2017.
  • 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 January 18, 2023.
  • 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.
FiledJuly 18, 1997
PublishedJanuary 21, 1998
GrantedOctober 16, 2002
Term endedJuly 18, 2017
Application numberEP 97305412
Classification (CPC)G02F1/13718

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedJuly 18, 1997PublishedJan 21, 1998Patent grantedOct 16, 2002Term endedJuly 18, 2017

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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