Rear-projection screen
CA 1324906 C · Owner: Clausen, Erik · Inventors: Clausen, Erik; Clausen, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transparent rear-projection screen (4) having a rear side to which red, green and blue pictures are projected from projectors (1, 2, 3). The rear side has Fresnel lenses (15) for paralleling the light beams received from the projectors. The front ide of the screen (4) has upright ridge-shaped lenses (14) and convex lenses (12, 13) located on both sides of the ridge-shaped lenses (14). For eliminating the BOcalled "color shadow" problem, the ridge-shaped lenses (14) have on its flanks light diffusing means which is a half-reflecting layer of lacquer (22) or a matted surface (22A) having irregularities in shape.
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
- Granted December 7, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 7, 2010.
- 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.