Easy to disperse polycarboxylic acid thickeners
CA 2104835 A1 · Owner: Wingo, William H. · Inventors: Wingo, William H.; Amjad, Zahid; Long, Carl J.Ii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interpolymer of at least one olefinically unsaturated carboxylic acid containing at least one activated carbon-to-carbon olefinic double bond and at least one carboxyl group in an amount of more than, 15% by weight based upon the weight of the interpolymer and at least one, steric stabilizer surfactant having at least one hydrophilic moiety and at leastone hydrophobic moiety and a linear block or a random comb configuration or mixtures thereof, made by polymerizing olefinically unsaturated carboxylic acid monomers in an organic media, in the presence of free a radical forming catalyst, and the steric stabilizer.
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
- Filed August 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 2015.
- 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.