Projection screen and process for production thereof
CA 1138234 A · Owner: Mitsui Petrochemical Industries, Ltd. · Inventors: Tamura, Naoyuki; Aoki, Hideya; Ohmata, Ken
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A projection screen comprises a metal plate member having substantially independent short ridged projections uniformly all over its surface. In a process for treating the surface of a metal plate member, a metal plate member and a rough surface contacting the surface of the metal plate member are moved along different axes intersecting at an angle.
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 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
- 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.