Production of aromatic polymers
CA 1045473 A · Owner: Imperial Chemical Industries Limited · Inventors: Ridd, John H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided for the production of thermoplastic aromatic polymers containing hydroxyl or thiol endgroups which comprises reacting a thermoplastic aromatic polymer containing alkali metal phenate or thiophenate, groups with at least one organic halide which undergoes elimination of both hydrogen and halogen atoms e.g. as hydrogen halide, rather tan substitution of the halide under the, reaction conditions employed.
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 January 2, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 1996.
- 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.