Water dispersible thickeners comprising hydrophilic polymers coated with particulate fatty acids or the salts thereof
CA 2111406 C · Owner: Phillips Petroleum Company · Inventors: Patel, Bharatkuma Balubhail
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a water dispersible particulate polymer composition having improved water dispersibility comprising a water soluble particulate polymer which has been contacted with a finely divided particulate dispersant comprised of at least one insoluble or sparingly soluble fatty acid or salt thereof so that the particles of the water soluble particulate polymer have dispersed thereon said finely divided particulate dispersant, a method for making said water soluble particulate polymer composition, and the use thereof in viscosifying water-based fluids.
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 December 14, 1993 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 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.