Process for preparing phosphate products
CA 1105672 A · Owner: Albright & Wilson Limited · Inventors: Edwards, Robert H.; Williams, Thomas A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Crude aqueous phosphoric acids containing dissolved water immiscible solvent can be treated with ammonia or alkali metal or alkaline earth metal compounds to form a liquid solvent phase separate from an aqueous solution phase of dihydrogen phosphate salt and phosphoric acid; the phases are separated, the solvent recycled for reuse in a solvent extraction process and the aqueous treated with ammonia or alkali or alkaline earth metal compounds to form a fertilizer or other phosphate salt.
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
- Granted July 28, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 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.