Liquid crystal projection apparatus
CA 2048107 C · Owner: Horii, Tsuneyuki · Inventors: Inada, Tomohide; Horii, Tsuneyuki; Wakatsuki, Kazuaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid crystal color projection apparatus includes a light source, dichroic mirrors transmission, type liquid crystal panels a beam mixing section, two, parallel side plates and bar members. The dichroic, mirrors separate light supplied from the light source, into red green, and blue beams. The transmission type liquid crystal panels are respectively arranged on the optical paths of the three color beams separated by the dichroic mirrors so as to form images corresponding to the three color beams. The beam mixing section mixes image beams from the transmission liquid crystal panels to reproduce a color image. The side plates have plural pairs of engaging portions, arranged at symmetrical …
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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 July 30, 1991 and granted June 7, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2013.
- 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.