Spd light valve film incorporating new suspending media, and light valve incorporating same
CA 2520701 C · Owner: Chakrapani, Srinivasan · Inventors: Slovak, Steven M.; Chakrapani, Srinivasan; Forlini, Matthew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A film suitable for use as a light-modulating unit of a suspended particle device light valve. comprising droplets of a liquid light valve suspension comprising a plurality of particles dispersed in a liquid suspending medium distributed within an optionnally crosslinked matrix polymer. The suspending medium is substantially immiscible with the matrix polymer has a boiling , point greater than about 100 ~C has an electrical resistivity of at least about 0.8 x 106 ohms per square, and has an index of refraction at 25 ~C which differs from that of the matrix polymer by no more than about 0.002.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 13, 2004 and granted July 9, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 13, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 13, 2026.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.