Physical separation processes for mineral slurries
CA 2179991 C · Owner: Hoecker, Walter · Inventors: Newell, Andrew; Hoecker, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flotation process for the separation of a mineral of non-sulphidic character such as a talcose mineral, from a mineral of sulphidic character, for example a base metal sulphide characterised in that a slurry containing a mixture of the minerals is subjected to a sequence of mineral dressing operations in which a non oxidising gas or gas mixture and reducing agent are added to the slurry to maintain an electrochemical potential conducive to the separation of the minerals.
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 July 4, 1995 and granted December 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2017.
- 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.