Block copolymer dispersants
CA 1303267 C · Owner: West, Michael W.J. · Inventors: West, Michael W.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Block copolymers composed of similar monomers but which exhibit substantially different polarity provide excellent performance as pigment dispersants. One of the blocks has cationic ammonium, phosphonium or sulfonium moieties. Each of the blocks is formed from monomers of the formulas CH2=CHCO2R and CH2=CCH3CO2R, where R is alkyl or alkyl ether, with one of the blocks containing at least two pendant ionic moieties. The block copolymers may be prepared using group transfer polymerization techniques.
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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 June 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 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.