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Expired Canadian patentCanada

Waterflow separation system for ores

CA 1333701 C · Owner: Dcrs (Canada) Ltd. · Inventors: Barefoot, Robert Ross

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

The separation of heavier particles containing metals from an ore in a slurry of water is effected by passing the slurry over a series of trays so as to generate in the slurry both electrostatic and centrifugal forces which can be combined to separate the heavier metal particles from the remaining ore. Each tray has a plurality of small rectangular cells formed in the upwardly facing surface thereof, each cell being generally square with a closed bottom and a swirl chamber formed at the bottom of the cell. The slurry entering the cell swirls around within the cell around a horizontal axis so as to generate high centrifugal forces due to the small dimensions of the cell. Electrostatic …

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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

  • Granted December 27, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 27, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 21, 1989
GrantedDecember 27, 1994
Term endedDecember 27, 2011
Patent numberCA 1333701 C
Classification (IPC)B03B7/00 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedSep 21, 1989Patent grantedDec 27, 1994Term endedDec 27, 2011

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.