Expired European patentEurope
Light modulating material comprising polymer dispersed liquid crystals
EP 0505448 B1 · Applicant: SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOV. OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
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.
Why it's free to use
- Filed December 13, 1990 and granted April 23, 1997. A European patent lasts at most 20 years from filing, so its term ended December 13, 2010.
- 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, 2016.
- 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, 1990
PublishedSeptember 30, 1992
GrantedApril 23, 1997
Term endedDecember 13, 2010
Application numberEP 91901304
Classification (CPC)C09K19/544 +1 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.