Lime sludge treatment process
CA 2180118 C · Owner: Fuller Company · Inventors: Matweecha, David M.; Euston, Charles R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method and apparatus for the heat treatment of lime sludge (CaCO3) to form burnt lime (CaO). In the method of the present invention a , lime sludge feed is entrained in and thereafter dried in a gas flash dryer means (4) to produce a dried lime sludge. The dried lime sludge is separated from the gas by a cyclone separator (3) and thereafter fed to a rotary kiln (10) in which the dried lime sludge is converted to active burnt lime. In order to maintain the flow of gas in the flash dryer means (4) at a predetermined velocity and in order to entrain all the lime sludge feed in the gas flow, an adjustable portion of the separated gases are recycled through the flash dryer …
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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 December 30, 1994 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2016.
- 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.