Polycarbonate blends
CA 2124509 A1 · Owner: Rohm And Haas Company · Inventors: Dunkelberger, David L.; Wetzel, Donna M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to methacrylate copolymers and blends of polycarbonate and methacrylate copolymers. It further relates to blends of polycarbonate and methyl methacrylate-tribromophenyl maleimide copolymers. These blends are miscible and have excellent transparency and thermal resistance. It further relates to processes, and articles and uses of these blends.
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 May 27, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2016.
- 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.