US3712364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of vacuum casting metal
Assignee: Individual
•
Filing: 1970-11-25
•
Granted: 1973-01-23
•
Expires: 1990-11-25
Abstract
Abstract A metal casting system especially adapted for the rapid melting and casting of small charges of metal, utilizing resistance heating of such charge and immediate delivery of the molten metal to a suction mold.
Inventors
- 👤 A Daniel
- 👤 J Richey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:54
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
35 words
The method of claim 1 wherein such mold is a suction mold, and suction is applied to such mold to provide the pressure differential to draw such molten metal from such container into such mold.
Claim 2
Dependent Claim
45 words
The method of claim 1 wherein the surface tension of such molten metal is sufficient to inhibit passage of the metal through the opening of such container under the influence of gravity, and such pressure differential is effective to overcome such surface tension when applied.
Claim 3
Dependent Claim
46 words
The method of claim 1 wherein the temperature of the metal charge is sensed during heating thereof and such pressure differential is abruptly applied to force the molten metal through the container opening into the mold after the molten metal has reached the optimum casting temperature.
Claim 4
Dependent Claim
15 words
The method of claim 4 wherein the temperature of the metal charge is electrically sensed.
Claim 5
Dependent Claim
34 words
The method of claim 4 wherein an infrared radiation detector is focused upon the charge in the container to sense the temperature of such charge by response to the infrared radiation of the metal.
Claim 6
Dependent Claim
52 words
The method of claim 1 wherein the container and mold are brought into tight sealing engagement with each other prior to melting the metal charge, and suction is applied to the mold to provide the pressure differential on the molten metal in the container which draws such molten metal into the mold.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein such melting operation is carried out in an inert atmosphere.
Claim 8
Dependent Claim
62 words
The method of claim 1 wherein such container comprises two electrically conductive halves which are insulated from each other, and pressure is applied to the metal charge within the container to insure adequate electrical contact between the metal charge and such container halves for passage of electric current through the metal charge when such electric current is supplied to the container halves.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein such optimum casting temperature is near the upper liquidous limit of the metal charge.
References Cited (Backward Citations)
US1659638A
Cited
US2024615A
Cited
US2685718A
Cited
US2997756A
Cited
US3435878A
Cited
GB991240A
Cited
US3434527A
Cited
US3494199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |