US3955169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High power resistor
Assignee: United States Department of the Air Force
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Filing: 1974-11-08
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Granted: 1976-05-04
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Expires: 1994-11-08
Abstract
Abstract A thick film spiral shaped resistor deposited on an alumina substrate and bonded to a Kovar plate, an aluminum heat sink is coated on one side with a silicon grease and the Kovar plate is bolted thereto.
Inventors
- 👤 Charles S. Kerfoot
- 👤 Frank A. Halgas
- 👤 Louis A. Razzetti
- 👤 Gene A. Di Gennaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:25
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/08; H01C1/084
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A high power resistor for microcircuits comprising: a planular alumina substrate; a longitudinally extending, thick film resistive means having a planar spiral configuration at one terminus, deposited on the substrate; terminal means affixed to opposite ends of the resistive means; a heat plane base means; means for bonding the base means to the substrate means; heat sink means adapted to conform in one surface dimension to one surface dimension of the base means; means for affixing the conforming surface dimensions of the heat sink means to the base means, and means for lubricating the abutting surfaces.
Claim 2
Dependent Claim
96 words
A high power resistor for microcircuits comprising: a planular alumina substrate; a longitudinally extending, thick film resistive means having a planar spiral configuration at one terminus, deposited on the substrate; terminal means affixed to opposite ends of the resistive means; a heat plane base means; means for bonding the base means to the substrate means; heat sink means adapted to conform in one surface dimension to one surface dimension of the base means; means for affixing the conforming surface dimensions of the heat sink means to the base means, and means for lubricating the abutting surfaces.
Claim 3
Dependent Claim
20 words
A high power resistor for micro-circuits according to claim 1 wherein the bonding means is a thermally conductive epoxy cement.
Claim 4
Dependent Claim
20 words
A high power resistor for microcircuits according to claim 1 wherein, the lubricating means is a high temperature silicon grease.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |