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US3851150A
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Electrical resistance tubular heating conductor with axially varying power distribution
Assignee: Gesellschaft zur Foerderung der Forschung an der Eidgenoessischen Technischen Hochschule
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Filing: 1972-11-07
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Granted: 1974-11-26
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Expires: 1992-11-07
Abstract
Abstract An electrical resistance tubular heating conductor of axially varying power distribution having a constant wall thickness body and an axially varying metal coating thereon is made by depositing the metal coating in an axial direction at a varying rate.
Inventors
- 👤 Holzen G Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:50
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; C; C25; C25D; C25D7/00; C25D7/04; G; G21; G21C; G21C17/00; G21C17/06; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
An electrical resistance heating conductor having an axially varying electrical power distribution, comprising: a metallIc tubular body of electrical resistance material having approximately constant wall thickness; and a metallic layer of electrical resistance material coated on said tubular body and metallically and integrally connected thereto, said metallic layer forming a tube and being of continuously axially varying thickness, largest at both ends, and having an axial section appearing as a smooth bent curve.
Claim 2
Dependent Claim
73 words
An electrical resistance heating conductor having an axially varying electrical power distribution, comprising: a metallIc tubular body of electrical resistance material having approximately constant wall thickness; and a metallic layer of electrical resistance material coated on said tubular body and metallically and integrally connected thereto, said metallic layer forming a tube and being of continuously axially varying thickness, largest at both ends, and having an axial section appearing as a smooth bent curve.
Claim 3
Dependent Claim
17 words
The heating conductor of claim 1, wherein said metallic layer is interconnected to said tubular body galvanically.
Claim 4
Dependent Claim
20 words
The heating conductor of claim 1, wherein said metallic layer is interconnected to said tubular body by vacuum vapor coating.
Claim 5
Dependent Claim
16 words
The heating conductor of claim 1, further comprising a protective tube located over said metallic layer.
Claim 6
Dependent Claim
22 words
The heating conductor of claim 1, wherein the thickness of said metallic layer, viewed in axial section, appears as a cosine function.
References Cited (Backward Citations)
DE645326C
Cited
US2569773A
Cited
US2537671A
Cited
US2689803A
Cited
US2891375A
Cited
US2978664A
Cited
US3336558A
Cited
US3432922A
Cited
US3629776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |