Crosslinked sulfonated polystyrenes and process for the preparation thereof
CA 1114097 A · Owner: National Starch And Chemical Corporation · Inventors: Ray-Chaudhuri, Dilip K.; Iovine, Carmine P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Foxwood Drive Somerset, New Jersey 08873, DILIP K. RAY-CHAUDHURI 484 Rolling Hills Road, Bridgewater, New Jersey 08876 Crosslinked Sulfonated Polystyrenes, And Process For The Preparation Thereof Abstract of the Disclosure, Polystyrene and styrene copolymers are simultaneously crosslinked and sulfonated in a homogeneous reaction mixture by incorporation of from 0.1 to 5 mole percent of specific crosslinking reagents in the polymer sulfonating solution. The crosslinking reagents are selected aryl compounds having at least two -CH2X radicals where X is hydroxyl chlorine or, bromine. - 1 -
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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 December 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 1998.
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Timeline
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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.