Method for the preparation of aromatic polyesters
CA 2087939 A1 · Owner: Perry, Robert J. · Inventors: Perry, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for preparing aromatic polyester comprising reacting carbon monoxide, a diol and an, aromatic trifluoromethane sulfonate reactant having the general formula, , in the presence of solvent and a catalyst. Ar is selected from the group consisting of aromatic and heteroaromatic moieties having a total of ring carbons and heteroatoms of from 6 to about 30. The catalyst is a compound of a metal selected from the group consisting of platinum, palladium and nickel.
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 January 22, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2015.
- 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.