Sludge handling and feeding system
CA 2247454 A1 · Owner: Mcqueen, Anne T. · Inventors: Mcqueen, Anne T.; Biggs, Harley O. Jr.; Leonard, R. Leon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a system for handling and feeding aqueous sludge to a combustor such that pollutant emissions associated with combustion operations e.g. cement manufacturing, are reduced. The system contains combustion means; first receiving means for receiving the sludge to be combusted; means for transporting the sludge from the first receiving means to a sludge conduit; and means for introducing the sludge from the sludge conduit into the combustion means at a point effective to reduce pollutant emissions produced by the combustion of the sludge.
Read the whole patent
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 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2019.
- 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.