US4064477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal foil resistor
Assignee: Dale Electronics Inc
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Filing: 1975-08-25
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Granted: 1977-12-20
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Expires: 1995-08-25
Abstract
Abstract The present device is a high reliability resistor comprising a sheet of metal foil secured to the flat side of a substrate and with the opposite side of the substrate formed to dissipate heat into the ambient thus enabling the present resistor to have an improved temperature coefficient of resistance (TCR) and further enabling the resistor to function satisfactorily in a high wattage mode.
Inventors
- 👤 Edward E. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:32
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/08; H01C1/084
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A metal foil resistor comprising in combination: a substrate of electrically non-conducting material having first and second relatively large surfaces, said first surface formed substantially flat, said second surface formed with grooves to cause the surface area of said second surface to be substantially in excess of said first surface; a layer of electrically conducting metal foil secured to said first surface, said layer of metal formed in a zig-zag pattern to provide an elongated path for electricity passing therethrough; first and second electrical wires secured to two different positions on said layer of electrically conducting metal foil; and encapsulating means formed to embed said substrate and said metal foil within and further formed to permit said electrical wires to protrude therefrom.
Claim 2
Dependent Claim
122 words
A metal foil resistor comprising in combination: a substrate of electrically non-conducting material having first and second relatively large surfaces, said first surface formed substantially flat, said second surface formed with grooves to cause the surface area of said second surface to be substantially in excess of said first surface; a layer of electrically conducting metal foil secured to said first surface, said layer of metal formed in a zig-zag pattern to provide an elongated path for electricity passing therethrough; first and second electrical wires secured to two different positions on said layer of electrically conducting metal foil; and encapsulating means formed to embed said substrate and said metal foil within and further formed to permit said electrical wires to protrude therefrom.
Claim 3
Dependent Claim
14 words
A metal foil resistor according to claim 1 wherein said grooves are V-shaped grooves.
Claim 4
Dependent Claim
13 words
A metal foil resistor according to claim 1 wherein said grooves are arch-shaped.
Claim 5
Dependent Claim
13 words
A metal foil resistor according to claim 1 wherein said grooves are rectangular-shaped.
Claim 6
Dependent Claim
16 words
A metal foil resistor according to claim 1 wherein said substrate is formed of beryllium oxide.
Claim 7
Dependent Claim
137 words
A metal foil resistor comprising in combination: a substrate of electrically non-conducting material having first and second relatively large surfaces, said first surface formed substantially flat, said second surface formed with grooves to cause the surface area of said second surface to be substantially in excess of said first surface; a layer of metal means formed and secured to the surfaces of said grooves; a layer of electrically conducting metal foil secured to said first surface, said layer of metal foil formed in a zig-zag pattern to provide an elongated path for electricity passing therethrough; first and second electrical wires secured to two different positions on said layer of electrically conducting metal foil; and encapsulating means formed to embed said substrate and said metal foil within and further formed to permit said electrical wires to protrude therefrom.
Claim 8
Dependent Claim
137 words
A metal foil resistor comprising in combination: a substrate of electrically non-conducting material having first and second relatively large surfaces, said first surface formed substantially flat, said second surface formed with grooves to cause the surface area of said second surface to be substantially in excess of said first surface; a layer of metal means formed and secured to the surfaces of said grooves; a layer of electrically conducting metal foil secured to said first surface, said layer of metal foil formed in a zig-zag pattern to provide an elongated path for electricity passing therethrough; first and second electrical wires secured to two different positions on said layer of electrically conducting metal foil; and encapsulating means formed to embed said substrate and said metal foil within and further formed to permit said electrical wires to protrude therefrom.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |