Liquid crystal dimmer plate and lighting system including the same
CA 2106782 C · Owner: Takata, Kensaku · Inventors: Katsuda, Morihiko; Takata, Kensaku; Tachikawa, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lighting system comprises a light source (2) a, liquid crystal dimmer plate (4) for scattering a desired quantity of light from the light source (2) and a control, power supply (5) for controlling a light scattering rate of said liquid crystal dimmer plate (4) so that a light, component, included in the light from the light source (2), transmitted through the liquid crystal dimmer plate (4) with no scattering is employed as illuminating light. -52-
Read the whole patent
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 November 12, 1992 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2014.
- 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.