Method of operating a multiple hearth furnace
CA 2443041 A1 · Owner: Arendt, Steve · Inventors: Ferretti, Pascal; Lonardi, Emile; Arendt, Steve
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of operating multiple hearth furnace (10) with a plurality of vertically aligned hearth floors (361, 362 363, 364, 365), comprises in , particular following steps. A first material is fed onto the uppermost hearth floor and moved over this uppermost hearth floor (361) before it falls through a drop hole (40) onto the next lower hearth floor. This first material is processed in this way from hearth floor to hearth floor down to the lowermost hearth floor (366). A second material is fed onto one of the hearth floors to be mixed into the first material. This second material (64) is moved separately from the first material in a separate annular zone (68) of the hearth floor …
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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 April 25, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2024.
- 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.