Process for increasing the yield during the flotation of potash salts
CA 2086788 C · Owner: Hagedorn, Fritz · Inventors: Hagedorn, Fritz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process for the flotation of potash salts using, conditioning agents in the pre-flotation and postflotation stages, is optimized. The starting material is at first floated with a partial quantity of the collector and a first pre-concentrate is formed; then the remainder of the collector as well as the frothing agent and the modifiers, especially non-polar substances are added and, a second pre-concentrate is generated.
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 January 6, 1993 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 6, 2015.
- 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.