Process for the recovery of minerals from non-sulfidic ores by flotation
CA 2083818 A1 · Owner: Kottwitz, Beatrix · Inventors: Schreck, Berthold; Koester, Rita; Kottwitz, Beatrix
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A process for the recovery of minerals from non-sulfidic ores by flotation, Esters of dicarboxylic acids with fatty acid monoalkanolamides, optionally in admixture with other anionic or nonionic surfactants, are suitable as collectors for the flotation of non-sulfidic ores, more particularly apatite.
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 May 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2013.
- 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.