Method and apparatus for continuous in-line gas treatment of molten metals
CA 2221194 C · Owner: Alcan International Limited · Inventors: Dube, Ghyslain; Waite, Peter D.; Lavoie, Serge Eugene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A method of and apparatus for treating molten metal to achieve effective removal of such unwanted inclusions as gases alkali metals, entrained solids, and the like. The method comprises continuously introducing molten metal into a container forming a trough or trough section such as the trough provided , between a melting furnace and a casting machine providing at least one , mechanically movable gas dispenser (11) submerged within the metal (15) in the container and introducing a gas into the metal adjacent to a gas disperser (14) in a part of the trough forming a treatment zone such that the gas is broken into smaller bubbles by the gas dispenser (11) and dispersed through the …
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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 July 28, 1995 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 28, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 2017.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.