Hydrophilic polymer concentrates
CA 2432442 C · Owner: Rangel, Carolina Trejo · Inventors: Dobson, James W. Jr.; Rangel, Carolina Trejo; Hayden, Shauna Leigh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a hydrophilic, water soluble polymer concentrate for addition to aqueous liquids to enhance the properties thereof particularly to increase the viscosity or decrease the fluid loss of well drilling and servicing fluids the concentrate comprising a hydrophobic water insoluble liquid, an organophilic clay suspension agent the water soluble polymer, and a stabilizing agent comprising one or more acids in an amount from about 0.001% to about 1.5% one or more anionic surfactants in an amount from about 0.001 % to about 1.0% one or more nonionic surfactants in an amount from 0.001% to about 0.625% and from about 0% to about 0.75% of one or more water soluble organic liquids wherein …
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 June 16, 2003 and granted January 25, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2025.
- 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.