Treatment of oxide-containing dusts
CA 2089755 A1 · Owner: Cowx, Peter Malcolm · Inventors: Cowx, Peter Malcolm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An arc is drawn between a movable electrode (E) (preferably graphite), and a fixed electrode (7) in a furnace when smelting metal oxides using a plasma. Shielding gas, e.g. N is introduced into , plenum (P) about the movable electrode (E) to prevent metal vapour from settling on the inner lining (3; 9) of the furnace (1). The movable electrode (E) may be connected to a mast (30) on the furnace roof (4) to align that electrode (E) in its path through a hole (10) in the roof (4) into the furnace chamber (C).
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 August 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 19, 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.