Process for the recovery of minerals from non-sulfidic ores by flotation
CA 2092440 A1 · Owner: Koester, Rita · Inventors: Schreck, Berthold; Bunte, Reinhard; Koester, Rita
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, Salts of esterification products of maleic acid with oligoglycerol partial esters corresponding to formula (I) (I), in which, R1, R2, R3 and R4 independently of one another represent hydrogen, a saturated aliphatic acyl radical containing 8 to 18 carbon atoms or a CO-CH=CH-COOX- group X is an alkali metal or ammonium and, n is 0 or a number of 1 to 18 with the proviso that at least one of the substituents R1 to R4 is an acyl radical and at least one is a CO-CH=CH-COOX group, optionally in admixture with other anionic or nonionic surfactants, are suitable as collectors for the flotation of non-sulfidic …
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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
- Filed September 16, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 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.