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Expired European patentEurope

Liquid crystal light-modulating device imparted with memory effect and display unit utilizing same

EP 0283916 B1 · Applicant: HITACHI, LTD.

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Overview

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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 16, 1988 and granted December 29, 1993. A European patent lasts at most 20 years from filing, so its term ended March 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 September 16, 2013.
  • 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 16, 1988
PublishedSeptember 28, 1988
GrantedDecember 29, 1993
Term endedMarch 16, 2008
Application numberEP 88104176
Classification (CPC)G02F1/141

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedMarch 16, 1988PublishedSep 28, 1988Patent grantedDec 29, 1993Term endedMarch 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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