Process and apparatus for coating small solids
CA 2022376 C · Owner: Dutta, Arunava · Inventors: Dale, Ernest A.; Dutta, Arunava; Dullea, Leonard V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to processes and apparatus useful for fluidizing small particulate solids having a diameter of less than about 50 microns in average particle size, and at least partially enveloping these small solids with a coating material or a precursor thereto. The basic apparatus of this invention comprises:, a cross-current multi-stage fluid bed reactor having N fluid beds in flow communication with one another, wherein N > 2;, means for introducing small solid particles to a bed selected from the N beds of the reactor; means for introducing a fluidizing gas to the N beds of the reactor, thereby promoting a flow of the small solid particles from the first bed through …
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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 31, 1990 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2012.
- 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.