Purification of phosphoric acid
CA 1095218 A · Owner: Occidental Petroleum Corporation · Inventors: Bradford, James L.; Ore, Fernando
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the purification of phosphoric acid which comprises: a) contacting an aqueous phosphoric acid phase containing from 1% to about 55% P205 by weight and dissolved ionic metallic impurities selected from the group consisting of calcium, magnesium aluminum and iron (II and III) with an organic extractant phase comprising a water immiscible organic solvent containing at least one water immiscible organic sulfonic acid having at least 12 carbon atoms and at least one water immiscible organic phosphate phosphonate, or half ester thereof dissolved therein to form: i. a purified phosphoric acid phase; and ii. a loaded organic extractant phase containing ionic metallic impurities …
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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
- Granted February 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 10, 1998.
- 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.