Higher molecular weight arylene sulfide resin and process for its preparation
CA 2004259 A1 · Owner: Hoover, Kenneth C. · Inventors: Clark, Earl, Jr.; Scoggins, Lacey E.; Reger, Roy E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a first embodiment arylene sulfide resins are provided by contacting, in a polymerization mixture during a polymerization process, reactants comprising: an alkali metal sulfide an organic amide, an, alkali metal carboxylate water and a monomer source which comprises at least one dihaloaromatic compound. The amount of alkali metal carboxylate present prior to the initiation of the polymerization process ranges from about 0.002 to about 0.05 mole per each mole of sulfur present in the resulting arylene sulfide resin. The total amount of water present during the polymerization process ranges from about 1.02 to about 2.1 moles per each mole of sulfur present in the resulting arylene sulfide …
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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
- Filed November 30, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.