Melt stabilization of poly(arylene sulfide sulfone)s
CA 1331901 C · Owner: Yelton, Harold D. · Inventors: Bobsein, Rex L.; Yelton, Harold D.; Lindstrom, Merlin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved poly(arylene sulfide sulfone)s are prepared by contacting these polymers with a zinc source, optionally first with an alkali metal base for a period of time sufficient to incorporate enough zinc cations to improve the melt stability of the polymers. The polymer can be subsequently cured to increase molecular weight. The melt stable poly(arylene sulfide sulfone)s can be processed in conventional commercial applications to provide fibers film, moldings and other articles of manufacture.
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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 September 6, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 6, 2011.
- 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.