Fly ash benefication by carbon burnout in a dry bubbling fluid bed
CA 2107571 C · Owner: Progress Materials Inc. · Inventors: Cochran, Joseph W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an apparatus method and product wherein fine , particles of 17y ash containing carbon are oxidized in a dry, bubbling fluid bed of previously introduced fine particles of the same fly ash so chat the subsequently removed particles have reduced carbon content and are useful as pozzolan suitable for use, without further processing to replace a portion of ce-, ment in concrete. The apparatus comprises a means for introducing said carbon containing fly ash particles into a dry bubbling fluid bed reactor (30). The dry bubbling bed reactor contains fly ash particles (31), means for introducing air into the reactor (34 and 35), means for removing beneficiated fly ash …
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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 22, 1991 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 22, 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.