Method for hiding scratches or imperfections on the surface of screens used in projection systems
CA 2058845 C · Owner: Rohm And Haas Company · Inventors: Ushida, Shinzo; Ludwig, Edward Garland, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel light diffusing resin (material) has been invented which combines excellent light diffusing properties with high light transmission. The combination of, properties is possible because the material does not significantly backscatter light. Also, the material exhibits good contact clarity. This light diffusing material is an, excellent choice for use in projection systems as a method for hiding scratches or, imperfections in a rear projection screen such as a TV screen rear projected , slides, liquid crystal display (LCD screens or a thin layer electric decoration sheet by using a, plastic sheet containing specific light diffusing particles therein and having a, combination of …
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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 January 7, 1992 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 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.