Process for protecting a pvc surface against the effects of sunlight
CA 1094897 A · Owner: Dynamit Nobel Aktiengesellschaft · Inventors: Budich, Wolfgang; Krah, Robert; Scharf, Karl-Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is concerned with a process for protecting a PVC surface against the effects of sunlight comprising the, step of applying to the PVC surface to be protected a surface, layer of polymethyl methacrylate or a copolymer thereof. The, surface layer is so applied that it firmly adheres on the PVC surface, and it contains color pigments and UV stabilizers and/or UV absorbers so that it be almost impermeable to UV radiations. This process is characterized in that the surfac? layer is made to be not absorbent of any IR radiation the IR radiation being, reflected by an appropriate pigmenting of the PVC layer with IRreflecting coloring agent upon the impingement thereof.
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 February 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 3, 1998.
- 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.