Biologically degradable esterquats as flotation aids
CA 2244899 A1 · Owner: Henkel Kommanditgesellschaft Auf Aktien · Inventors: Herold, Claus-Peter; Koeppl, Dietger; Dobias, Bohuslav
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns the use of so-called quaternary esters as an aid for flotation of non-sulfidic minerals. It was discovered that the products of quaternary esterification of mono, di or trialkanolamine containing aliphatic carboxylic acids present good collector properties on the one hand especially , for the flotation of silicates and on the other hand an exceptional , biodegradability under both aerobic as well as anaerobic conditions.
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 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2019.
- 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.