Process for regenerating spent bleaching earth
CA 2077067 C · Owner: N.V. Vandemoortele International · Inventors: Dijkstra, Albert J.; Maes, Pieter J. A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the regeneration of spent bleaching earth, comprising an oxidative heat treatment in which the amount of oxygen supplied exceeds the stoichiometrical requirement of complete oxidation of all organics present in the spent bleaching earth wherein the spent, bleaching earth and the oxygen are blown through a stationary fluidized bed of inert granulate material. The stationary fluidized should be as high as to limit the temperature in the freeboard to less than 1000°C. As a matter of fact it has been, found that, if the fluidized bed is not high enough the oxygen, required to burn off the organics content of the spent bleaching earth would blow out …
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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 August 27, 1992 and granted March 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 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.