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US 5,392,842 AGranted
Casting metals
AssigneeJ.F. Jelenko & Co.
InventorConstantino M. Volpe
Life of this patent
Estimating the term…
Abstract
Metal is cast by melting it in a crucible over a hole too small to enable gravity to make the molten metal pass through the hole and with a diameter to length ratio greater than one, after which increased pressure is applied to the metal to drive it through the hole into a mold.
Claims2
A method of casting a dental casting which comprises:
- melting a metal in a compartment,
- said metal being titanium, and
- said compartment being disposed above a copper crucible and containing an arc heating means including an electrode therein,
- said crucible including a hole therethrough,
- said hole having a diameter to length ratio of greater than one and being of such size that surface tension of said metal prevents gravity's moving said metal through said hole, and
- thereafter applying pressure in said compartment to drive said metal through said hole into a dental casting mold.
3 more elements
Dependencies are inferred from the claim text.