Production of aromatic sulfide/sulfone polymers
CA 1311084 C · Owner: Clark, Earl, Jr. · Inventors: Bobsein, Rex L.; Clark, Earl, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for the production of high molecular weight aromatic sulfide/sulfone polymer comprising contacting under suitable polymerization conditions: (a) an organic amide (b) an alkali metal, sulfide or hydrosulfide (c) water, and (d) a dihaloaromatic sulfone wherein the molar ratio of (a) to (b) is about 2:1 to about 24:1 the, improvement comprising employing a molar ratio of (a) to (c) of about 0.4:1 to about 1.3:1.
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 December 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 2009.
- 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.