Preparation of white calcium phosphates from off- colored lime
CA 1187675 A · Owner: Astaris Llc · Inventors: Munday, Theodore F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described for providing food grade calcium phosphate having an acceptably white color and purity level by reacting food grade phosphoric acid and an off-colored lime in the presence of from 0.01% to 0.3% of hydrogen peroxide, based on the amount of lime used, whereby the hydrogen peroxide bleaches the resulting calcium phosphate into an acceptably white product.
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 May 28, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2002.
- 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.