Projection screen
CA 1250773 A · Owner: N.V.Philips'Gloeilampenfabrieken · Inventors: Heijnemans, Werner A.L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
14, Abstract:, "Projection screen". A projection screen is described which comprises a single plate of a transparent material. The diffusion in the horizontal direction is provided by filamentary particles which are oriented substantially in one direction in the plate material. Both surfaces of the plate are then capable of performing different functions yielding a, projection screen with an optimally uniform brightness distribution minimal colour faults and maximum contrast.
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 March 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 7, 2006.
- 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.