US3709998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating element for an electric furnace
Assignee: Bpifrance Financement SA
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Filing: 1970-12-16
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Granted: 1973-01-09
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Expires: 1990-12-16
Abstract
Abstract The heating element is made of a refractory material resistant to oxidation, and comprises two hollow hemicylindrical parts disposed face to face by their concave portions at a slight distance from each other. These two parts are supplied with electric current at one of their ends and are connected together at their other end by a common cylindrical part. The exterior radii of the hemicylindrical parts and of the common cylindrical part, and the thicknesses of these parts, as well as the distance between the corresponding opposing edges of the two hemicylindrical parts, all decrease from the end by which the current is supplied to the end which is connected together by the common cylindrical part.
Inventors
- 👤 A Anthony
- 👤 M Faucher
- 👤 K Dembinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:56
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: 3
Claim 1
Independent Claim
27 words
Heating element according to claim 1, further comprising, at the free end of the hemicylindrical parts, a collar by which collar said heating element can be suspended.
Claim 2
Dependent Claim
34 words
Heating element according to claim 1, in which the thickness of the hemicylindrical parts is less than 8 millimeterS at the level of the useful part of the heating cavity of said heating element.
Claim 3
Dependent Claim
17 words
Heating element according to claim 1, in which the common cylindrical part is reduced to a ring.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |