Sheeting useful as a projection screen
CA 1138233 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Palmquist, Philip V.; Bradshaw, Thomas I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sheeting Useful as a Projection Screen Abstract, Sheeting useful as a projection screen especially for projection television, comprises a transparent film that is configured on its back surface with a random pattern of generally parallel elongated microscopic recesses and projections, is reflectively coated on that surface, and is configured on its front surface with lenticular light-refracting recesses and projections that spread light entering and leaving that surface. At least the recesses and projections on the back surface are convex or concave in both their longitudinal and transverse directions. The screen is generally oriented during use so that the elongated recesses and …
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.