Process for the preparation of polycarbonates
CA 1262597 C · Owner: Pogany, George Alexander · Inventors: Kuyper, Jan; Lednor, Peter William; Pogany, George Alexander
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of polycarbonates by reacting at least one epoxy compound with carbon dioxide at 40 to 200°C and 2 to 40 bar in the presence of a catalytic amount of a double metal cyanide complex and, a) one or more salts composed of at least bivalent metal ions and metal-free anions having a solubility in water of at least 1 g/100 ml at 25 °C, and/or, b) one or more no-metal containing acids of which a 0.1 N solution in water at 25 °C has a pH not exceeding 3.
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 October 31, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 31, 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.