Liquid crystal projector
CA 2058519 C · Owner: Sanyo Electric Co. Ltd. · Inventors: Miyashita, Yoshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid crystal projector for projecting original images formed on a liquid crystal panel onto a screen comprises optical means 3 between the liquid crystal panel 2 and the screen 4. The optical means 3 has a first refracting portion comprising planar glass plates 3a, 3c having a predetermined angle of inclination with respect to the optical axis of the panel and, a second refracting portion comprising planar glass plates 3b, 3d having an angle of inclination different from that of the first refracting portion. The position where an image is formed by the first refracting portion on the screen is shifted from the image forming position for the second refracting portion by a small amount …
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 December 27, 1991 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 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.