2-mercapto-benzoxazole derivatives as collectors for the selective flotation of metal ores
CA 2124359 C · Owner: Bergamini, Fabrizio · Inventors: Bergamini, Fabrizio; Marabini, Anna; Alesse, Vittorio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2-mercapto-benzoxazole derivatives, having formula (I): wherein: R R1, R2 and , R3, being the same or different are each, H, or a straight or branched alkyl alkoxyl or hydroxalkyl group with up to 12 carbon atoms; and M is H, Na, R, Li, Cs or NH4; are employed as collectors for the selective flotation of sulphide ores to separate mineral salts containing copper zinc, and silver.
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 November 24, 1992 and granted November 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 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.