Aromatic sulfide/sulfone polymer production
CA 1107446 A · Owner: Phillips Petroleum Company · Inventors: Campbell, Robert W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, High molecular weight aromatic sulfide/sulfone polymers are produced by contacting a dihalo aromatic sulfone an alkali metal sulfide other, than lithium sulfide and an alkali metal carboxylate in a sulfone diluent. Use of the alkali metal carboxylate results in polymers of high molecular weight having utility as coatings, films molded objects, fibers, filaments, and the like.
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 August 18, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 1998.
- 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.