Matte-finished polymethacrylate films
CA 2075216 C · Owner: Roehm Gmbh Chemische Fabrik · Inventors: Gross, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a polymethacrylate matte-finish surface and comprised of:, -- A thermoplastic polymer matrix A in the amount of, 99.9-30 wt.%, comprised of a hard phase (a1) and a tot phase (a2); and, -- Latex particles of a thermoelastic polymer B in t. of, 0.1-70 wt.%, incorporated in the said matrix A which particles, give rise to the matte effect. Preferably the hard phase (a1) may contain low molecular weight and/or polymer-bound UV-absorbers. The difference between index of refraction of the thermoplastic polymer A and that of the thermoelastic polymer B is at most 0.02. Despite its matte finish the film has high transparency, is weather resistant has low incidence of white …
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
- Filed August 3, 1992 and granted January 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2014.
- 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.