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Expired European patentEurope

Light valve suspensions and films containing UV absorbers and light valves containing the same

EP 0624813 B1 · Applicant: RESEARCH FRONTIERS INCORPORATED

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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 April 28, 1994 and granted July 4, 2001. A European patent lasts at most 20 years from filing, so its term ended April 28, 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 October 28, 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.
FiledApril 28, 1994
PublishedNovember 17, 1994
GrantedJuly 4, 2001
Term endedApril 28, 2014
Application numberEP 94201184
Classification (CPC)G02F1/172

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedApril 28, 1994PublishedNov 17, 1994Patent grantedJuly 4, 2001Term endedApril 28, 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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