Process for producing a kaolin clay product
CA 2064491 A1 · Owner: Matthews, Kirt L. · Inventors: Matthews, Kirt L.; Matthews, Kirt L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of concentrating solids in an aqueous clay slurry (15) is disclosed wherein liquid in the slurry is removed by contacting the aqueous clay slurry (15) with a semi-permeable membrane (80), preferably by passing the dilute aqueous slurry (15) of beneficiated kaolin along a surface of a semi-permeable membrane (80), while imposing a pressure differential across the membrane surface whereby water molecules are caused to pass through said semipermeable membrane (80) which is substantially impervious to the passage of clay solids therethrough, but pervious to the passage of water molecules, ions and dissolved salts therethrough. The aqueous kaolin slurry (17) having passed over the …
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 March 31, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 31, 2014.
- 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.