Method and apparatus for the dry grinding of solids
CA 2211513 C · Owner: Csendes, Ernest · Inventors: Csendes, Ernest
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for the dry grinding of solids, comprises initial coarse grinding of the solids in a controlled vortexing of a fluidized bed and directing the solid fine particles generally upwardly into a vortex grinding zone and grinding the upwardly directed solid particles in the vortex grinding zone by passing a portion of the particles through the vortex grinding zone. The vortex grinding zone comprises at least one successively vertically disposed grinding stage comprising passing particles upwardly through at least one horizontal vortex zone of an annular gap, defined by a stationary plate with a circular aperture, hereafter cleaning up the upward moving product mix by …
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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
- Filed July 25, 1997 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 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.