US3677332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum casting process
Assignee: Individual
•
Filing: 1969-06-13
•
Granted: 1972-07-18
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Expires: 1989-06-13
Abstract
Abstract The disclosure relates to a process and apparatus for casting metals by controlling the relative pressure of the space above the molten metal body to be cast with respect to the pressure within the interior of the mold. Numerous features of the mechanism are shown and described.
Inventors
- 👤 George A Smiernow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:37
CPC Classifications
B; B22; B22D; B22D39/00; B22D39/003; B22D18/00; B22D18/06; B22D41/00; B22D41/14; B22D41/50; B22D41/60; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A process of casting molten metals, using a ladle or the like having a pouring nozzle in the lower part thereof and a mold having an entrance opening or gate, which comprises applying the pouring nozzle of the ladle in line with the entrance opening of the mold, artificially cooling the molten metal within the pouring nozzle to initially block the pouring nozzle by solidified molten metal, maintaining a first pressure on the molten metal in the ladle, retaining a higher pressure in the mold, then melting the metal in the pouring nozzle so that the molten metal flow can begin into the mold and controlling the flow of molten metal to the mold by the relative difference in pressures between the pressure in the ladle and the pressure in the mold.
Claim 2
Dependent Claim
132 words
A process of casting molten metals, using a ladle or the like having a pouring nozzle in the lower part thereof and a mold having an entrance opening or gate, which comprises applying the pouring nozzle of the ladle in line with the entrance opening of the mold, artificially cooling the molten metal within the pouring nozzle to initially block the pouring nozzle by solidified molten metal, maintaining a first pressure on the molten metal in the ladle, retaining a higher pressure in the mold, then melting the metal in the pouring nozzle so that the molten metal flow can begin into the mold and controlling the flow of molten metal to the mold by the relative difference in pressures between the pressure in the ladle and the pressure in the mold.
Claim 3
Dependent Claim
182 words
A process of casting molten metal from a ladle or the like having a pouring nozzle at a lower position, into a mold having an inlet opening or gate, which comprises bringing the inlet opening of the mold into line with the pouring nozzle of the ladle, artificially cooling the molten metal in the pouring nozzle to cause it to solidify and initially block the pouring nozzle by solidified molten metal, maintaining a vacuum above the molten metal in the ladle in the range from 10 6 to 100 millimeters of mercury, maintaining a pressure within the mold in the range of between 2 millimeters of mercury and about one atmosphere and at least 1.5 times the absolute vacuum pressure on the upper surface of the molten metal within the ladle, then melting the metal within the pouring nozzle so that molten metal can begin to flow into the mold, and controlling the flow of molten metal to the mold by the relative difference in pressures between the pressure above the molten metal in the ladle and the pressure in the mold.
Claim 4
Dependent Claim
182 words
A process of casting molten metal from a ladle or the like having a pouring nozzle at a lower position, into a mold having an inlet opening or gate, which comprises bringing the inlet opening of the mold into line with the pouring nozzle of the ladle, artificially cooling the molten metal in the pouring nozzle to cause it to solidify and initially block the pouring nozzle by solidified molten metal, maintaining a vacuum above the molten metal in the ladle in the range from 10 6 to 100 millimeters of mercury, maintaining a pressure within the mold in the range of between 2 millimeters of mercury and about one atmosphere and at least 1.5 times the absolute vacuum pressure on the upper surface of the molten metal within the ladle, then melting the metal within the pouring nozzle so that molten metal can begin to flow into the mold, and controlling the flow of molten metal to the mold by the relative difference in pressures between the pressure above the molten metal in the ladle and the pressure in the mold.
References Cited (Backward Citations)
FR902495A
Cited
US2871533A
Cited
US3099053A
Cited
US3125440A
Cited
US3435878A
Cited
US3523785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |