Retro-reflective sheet material
CA 1047468 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Nellessen, Alfred H.; Holmen, Reynold E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An internally retro-reflective monolithic sealable transparent article having a smooth front surface and a plurality of cube-corner retro-reflecting units and intervening transparent septa embossed on the rear surface. The septa are disposed to divide the rear surface into a plurality of polygonal sealable cells each containing at least three of said cube-corner units and each having an area not greater than about one square inch. The septa permit transmission of light falling on the front face in areas corresponding thereto to improve the daytime appearance of the article, and they occupy an area compared to the area of said cube-corner units sufficiently small such that the article is …
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 January 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 1996.
- 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.