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Expired European patentEurope

Light modulator

EP 0303825 B1 · Applicant: Landis & Gyr Betriebs AG

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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 July 13, 1988 and granted September 30, 1992. A European patent lasts at most 20 years from filing, so its term ended July 13, 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 January 13, 2014.
  • 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 13, 1988
PublishedFebruary 22, 1989
GrantedSeptember 30, 1992
Term endedJuly 13, 2008
Application numberEP 88111180
Classification (CPC)G02F1/025

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedJuly 13, 1988PublishedFeb 22, 1989Patent grantedSep 30, 1992Term endedJuly 13, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.