Process for preparing aromatic polycarbonates
CA 1338409 C · Owner: Ho, Thoi · Inventors: Ho, Thoi; Kao, Che-I
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to high molecular weight polycarbonates prepared by reacting a sterically hindered, substituted aromatic bischloroformate with an alkali metal hydroxide in the presence of a substituted pyridine. This invention provides an industrially advantageous process for the production of high molecular weight polycarbonates using easily handleable materials and avoiding highly toxic precursors such as for example, phosgene
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 June 18, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 2013.
- 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.