Process for purifying clay by the hydrothermal conversion of silica impurities to a dioctahedral or trioctahedral smectite clay
CA 2315738 A1 · Owner: Mosiewicz, Marek R. · Inventors: Beall, Gary W.; Tsipursky, Semeon J.; Mosiewicz, Marek R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydrothermal reaction which dissolves the amorphous silica and the crystalline silica impurities contained in a recovered naturally occuring , montmorillonite clay and subsequently converts the dissolved silicas into a dioctahedral and/or trioctahedral smectite clay. The dissolution of silica is accomplished by adjusting the pH of an aqueous slurry of the recovered clay to a value of about 8.5 to about 10.0, preferably about 9.0 to about 9.5 at a , temperature of at least about 150 ~C preferably about 180 ~C to about 250 ~C more preferably about 190 ~C to about 235 ~C. Dissolved silica reacts with stoichiometric amounts of aluminum and/or magnesium and/or sodium added to the slurry, …
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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 February 24, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2021.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.