Method for cleaning molten metal
CA 1339703 C · Owner: Ishii, Toshio · Inventors: Sugiyama, Shunichi; Matsuno, Hidetoshi; Ishii, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for cleaning molten metal comprises the steps of keeping a pressure inside a vessel having molten metal therein at a pressure of Ps of atmospheric pressure or less, bubbling the molten metal in the vessel by gas soluble in the molten metal, a portion of said gas dissolving in the molten metal and the rest of the gas converting to gas bubbles, and reducing rapidly the pressure in the vessel to pressure PE, fine gas bubbles being produced in the molten metal in the vessel nonmetallic inclusions being trapped by said fine gas bubbles and by gas bubbles produced by bubbling and rising to the surface of the molten metal, and gas dissolved in the molten metal being removed. Pressure Ps …
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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
- Granted March 10, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 2015.
- 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.