US3571476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating element and electric furnace equipped with such an element
Assignee: Bpifrance Financement SA
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Filing: 1969-05-16
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Granted: 1971-03-16
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Expires: 1989-05-16
Abstract
Abstract An electric furnace comprising a heating element and a preheating element wherein the heating element is suspended within the preheating element the suspension means preventing direct contact between the heating elements.
Inventors
- 👤 Anne-Marie Anthony
- 👤 Michele Faucher
- 👤 Krzysztof Dembinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:54
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; F; F27; F27D; F27D11/00; F27D11/02; H05B3/0019; H05B3/62
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
Electric furnace equipped with a heating element made of a refractory material resistant to oxidation and comprising two parts connected together at one end, the other ends of these two parts constituting terminals via which electric current can be supplied to the heating element, said electric furnace comprising preheating means surrounding the heating element, the ensemble formed by the heating element, the ensemble formed by the heating element and preheating means being disposed at the interior of a cavity formed by a heat-insulating container, said furnace further comprising suspension means on which the heating element is suspended at the interior of said cavity by the ends of said heating element by which the electric current is supplied, the other end of said heating element being free, said suspension means preventing direct contact between said heating element and said preheating means.
Claim 2
Dependent Claim
140 words
Electric furnace equipped with a heating element made of a refractory material resistant to oxidation and comprising two parts connected together at one end, the other ends of these two parts constituting terminals via which electric current can be supplied to the heating element, said electric furnace comprising preheating means surrounding the heating element, the ensemble formed by the heating element, the ensemble formed by the heating element and preheating means being disposed at the interior of a cavity formed by a heat-insulating container, said furnace further comprising suspension means on which the heating element is suspended at the interior of said cavity by the ends of said heating element by which the electric current is supplied, the other end of said heating element being free, said suspension means preventing direct contact between said heating element and said preheating means.
Claim 3
Dependent Claim
42 words
Electric furnace according to claim 1, in which said suspension means, which prevent direct contact between the heating element and the preheating means and on which is suspended the heating element, are constituted by elements made of a metal resistant to oxidation.
Claim 4
Dependent Claim
70 words
Electric furnace according to claim 1, in which said suspension means, which prevent direct contact between the heating element and the preheating means and on which is suspended the heating element, comprise two semicylindrical elements, which have a first collar directed towards the exterior by which they are suspended on parts of the heat-insulating means and a second collar directed towards the interior by which they support the heating element.
Claim 5
Dependent Claim
131 words
Electric furnace according to claim 1, in which said suspension means, which prevent direct contact between the heating element and the preheating means and on which is suspended the heating element, comprise two parts made of refractory oxide and on which two parts bear respectively the two hemicylindrical parts of the heating element, said suspension means being arranged in a mannEr such that no electric current can circulate between the two constituent parts of said suspension means even if, by reason of temperatures higher than 2,000* C reached by the heating element, certain zones of said constituent parts of the suspension means become conductive of electricity, the refractory oxides constituting respectively the suspension means and the heating element being chosen such that no reaction is possible between these two refractory oxides.
Claim 6
Dependent Claim
28 words
Electric furnace according to claim 1, in which said heat-insulating container is surrounded by a double-walled metallic envelope between the walls of which can circulate a cooling liquid.
Claim 7
Dependent Claim
56 words
Electric furnace according to claim 4 in which said suspension means on which is suspended the heating element comprise a tube partially slotted axially, resting by one of its ends in a cooled base and supporting the two hemicylindrical parts of the heating element by the ends of its two parts separated by the axial slots.
Claim 8
Dependent Claim
34 words
Electric furnace according to claim 4, in which said suspension means on which is suspended the heating element comprise two hollow hemicylindrical parts disposed face to face at a slight distance from each other.
Claim 9
Dependent Claim
49 words
Electric furnace according to claim 4, in which said suspension means on which is suspended the heating element comprise a plate having a central hole on the edge of which can be suspended the heating element, said plate being separated into two parts joined together by a common zone.
Claim 10
Dependent Claim
64 words
Electric furnace according to claim 1, further comprising means for supplying electricity comprising a preheating circuit and a circuit for supplying the heating element, the preheating circuit comprising a mechanism for regulating the intensity of preheating, and the circuit for supplying the heating element comprising an element for detecting the starting of the heating element and for causing the cutoff of the preheating circuit.
Claim 11
Dependent Claim
64 words
Electric furnace according to claim 1, further comprising a member constituted by a tube element carrying at each of its ends a plurality of jaws operated in the manner of the jaws of a chuck and consequently capable of gripping, along two circles, a sample intended to be maintained at the interior of the heating cavity of the heating element comprised by the furnace.
References Cited (Backward Citations)
US3160693A
Cited
US3213177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |