US3634590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized copper electrode for vacuum arc furnace
Assignee: United States Department of the Air Force
•
Filing: 1970-07-02
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Granted: 1972-01-11
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Expires: 1990-07-02
Abstract
Abstract In a vacuum chamber there is positioned above an open receptacle or mold an electrode comprising three concentric copper tubes and a permanent magnet disposed in the lower end of the inner tube. A heat exchange medium is circulated between the walls of the tubes to provide for cooling of the electrode. A source of direct current is connected to the electrode which directs and conducts an arc onto a metal or alloy to be fused or melted in the mold.
Inventors
- 👤 Shingo Inouye
- 👤 George Saul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:06
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A vacuum arc furnace comprising an enclosed chamber having upper and lower closure members; an electrode comprising at least one copper extending through said upper closure member into said chamber, said tube having a permanent bar magnet positioned in its lower end; means for cooling said tube; a mold positioned below said tube; means for cooling said mold; a permanent ring magnet positioned around said mold; and means for maintaining a vacuum in said chamber.
Claim 2
Dependent Claim
75 words
A vacuum arc furnace comprising an enclosed chamber having upper and lower closure members; an electrode comprising at least one copper extending through said upper closure member into said chamber, said tube having a permanent bar magnet positioned in its lower end; means for cooling said tube; a mold positioned below said tube; means for cooling said mold; a permanent ring magnet positioned around said mold; and means for maintaining a vacuum in said chamber.
Claim 3
Dependent Claim
23 words
A vacuum arc furnace according to claim 1 in which a direct current power source is connected to said tube and said mold.
Claim 4
Dependent Claim
136 words
A vacuum arc furnace according to claim 1 in which said electrode comprises a first copper tube having a closed lower end and an open upper end; a second copper tube positioned within and spaced apart from said first tube, said second tube having a closed lower end with an opening formed therein and an open upper end; a third copper tube positioned within and spaced apart from said second tube, said third tube having a closed lower end and an open upper end; a ring member attached to said upper ends of said first, second and third tubes; a permanent bar magnet positioned in said lower end of said third tube; and in which said cooling means comprises an inlet means attached to said first tube, and an outlet means attached to said second tube.
Claim 5
Dependent Claim
25 words
A vacuum arc furnace according to claim 3 in which a metal cap is attached to said closed lower end of said first copper tube.
References Cited (Backward Citations)
US3398229A
Cited
US3444493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |