Method for the concentration of alkaline bismuthide in a material also containing molten lead
CA 1089651 A · Owner: Asarco Incorporated · Inventors: Scott, William L.; Di Martini, Carl R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Alkaline bismuthide is concentrated in a debismuthizing dross comprising the alkaline bismuthide and molten lead by a method involving charging the dross onto a heat-resistant screen or sieve of suitable mechanical strength. The screen has openings of such size as to enable the formation and retention thereof of a molten lead-pervious residue cake comprising particles of the alkaline bismuthide for example of, crystals of calcium magnesium bismuthide (Ca Mg2Bi2). The dross is subjected on the screen to the influence of a partial vacuum drawn from the opposite side of the screen from the dross and the molten lead is sucked or pulled through pore channels of the porous residue cake of 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
- Granted November 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 18, 1997.
- 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
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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.