Optical transmission sheet
CA 1260745 A · Owner: Stanton, Douglas A. · Inventors: Stanton, Douglas A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optical transmission sheet. A blackened optical system transmission sheet (11) includes a transparent substrate (16) having a front side (12) provided with at least a pair of elongate ribs (22) forming therebetween an elongate groove (28). An amount of optically black discrete particles (30) for absorbing visible ambient light is disposed in the groove. The particle amount is contained within the groove by means of a skin (34) which extends between the ribs and over the groove.
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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 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.