High solids bentonite slurries and method for preparing same
CA 2402845 A1 · Owner: Fairchild, Ian R. · Inventors: Fairchild, Peter H.; Fairchild, Ian R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pumpable and flowable bentonite clay slurries having a bentonite solids content of about 50 % or greater have been prepared for the first time through the use of a non-aqueous fluidizing agent characterized by being a highly-, saturated hydrocarbon oil with low affinity for reactivity with bentonite or other hydrophilic swelling agents such as starches guars and xanthans. The , slurries are useful in the economical transport of bentonite without impairing its swellability in aqueous media in applications such as mining papermaking , and oil drilling.
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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
- Filed March 14, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 14, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2022.
- 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.