Process and device for cleaning of bulk goods
CA 2053184 A1 · Owner: Schott, Hans Klaus · Inventors: Schott, Hans Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention concerns a process and a device for cleaning the grain surfaces of contaminated granular bulk material. The invention is particularly suited to final-cleaning of, in particular, thermally pre-regenerated sand (for example used foundry sand). According to the method of the invention, the bulk materials which are to be cleaned or final-cleaned are charged with a high pressure gas flow which maintains a fluidised bed of the bulk material and, creates a condition of turbulence within the fluidised bed in such a way that cleaning takes place while avoiding excessive impact or rebound stresses on the grains. Cleaning of the grains occurs primarily at the walls (which may be …
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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 October 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2013.
- 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.