Calcining a sludge comprising calciumcarbonate
CA 1162402 A · Owner: Escher Wyss Limited · Inventors: Florin, Gerd; Curtius, Friedrich; Sedlacek, Franz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sludge containing calcium carbonate to be calcined is granulated, and the granulated material obtained from the sludge is clacined in a fluidized state in two or more temperature stages advantageously on combustion of organic matter whereby the temperature, of granulated matter of the highest temperature stage is equal to or greater than 880°C, whilst the preceding temperature stages have a temperature of granulated matter of less than 880°C. In this way the gasification occurring on calcination takes place gradually in the particles of granular material, and the particles of granular material remain intact.
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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
- Granted February 21, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 21, 2001.
- 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.