An activator-frother composition
CA 2108071 C · Owner: Fernandez, Hector C. · Inventors: Fernandez, Hector C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An activator-frother composition which has good selectivity can be employed as additional reagent for the flotation of minerals of finely divided sulfide type and as sole reagent for the retreatment of flotation tailings. The composition consists of approximately 1% to 10% and preferably 2% to 8% by weight of pine oil approximately, 10% to 30% and preferably 12% to 20% by weight of sodium sulfide (Na2S) in 10% solution, approximately 15% to 36% and preferably 22% to 34% by weight of hydrogen peroxide (H2 0 2) in 50% solution, and approximately 20% to 40% and preferably 25% to 38% by weight of sodium bicarbonate (NaHCo3).
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 October 8, 1993 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 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.