Process for selective flotation of phosphorus minerals
CA 2076164 C · Owner: Clariant Produkte (Deutschland) Gmbh · Inventors: Bauer, Kurt; Krause, Jens M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for selective flotation of phosphorus minerals The invention relates to a process far the selective flotation of phosphorus minerals, in which process the flotation collectors used are one or more compounds of the formula 1a and/or 1b, wherein, R1 is a branched or straight-chain C8-C24-. in particular C7-C18-alkenyl, R2 is a branched straight-chain or cyclic alkyl, having 5 and/or 6 carbon atoms and M is hydrogen, an alkali metal or alkaline earth metal, ammonium or NR3R4R5 where R3, R4 and R5 independently of one another are hydrogen C1-C20-, alkyl or C1-C20-hydroxyalkyl, optionally as a mixture or combination with cocollectors.
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 August 14, 1992 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 2014.
- 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.