US4164607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film resistor having a thin layer of resistive metal of a nickel, chromium, gold alloy
Assignee: BAE Systems National Security Solutions Inc
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Filing: 1977-04-04
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Granted: 1979-08-14
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Expires: 1997-04-04
Abstract
Abstract High stability thin film resistors are made from an alloy comprising selected portions of nickel, chromium, and gold selected in a ratio to provide the desired temperature coefficient of resistance (TCR). The resistors are made by co-depositing gold with the nickel chromium alloy by a flash evaporation process. The evaporation process is carried out by feeding a nickel chromium wire, having a gold wire extending therealong to provide the desired composition, onto a heated tungsten strip within a vacuum system with substrates disposed in a position to obtain uniform deposition of the evaporated material thereon.
Inventors
- 👤 Ronald A. Thiel
- 👤 Edward H. Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:12
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/006; H01C17/00; H01C17/06; H01C17/075; H01C17/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12597; Y10T428/12611; Y10T428/12771; Y10T428/12778; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/12861; Y10T428/12889; Y10T428/12944; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
50 words
A thin film resistor comprising: a substrate of insulating material defining a support surface, and a thin layer of resistive metal comprising an alloy consisting of nickel, chromium, and gold of predetermined weight percentages wherein the percentage of gold is not greater than the combined percentage of nickel and chromium.
Claim 2
Dependent Claim
50 words
A thin film resistor comprising: a substrate of insulating material defining a support surface, and a thin layer of resistive metal comprising an alloy consisting of nickel, chromium, and gold of predetermined weight percentages wherein the percentage of gold is not greater than the combined percentage of nickel and chromium.
Claim 3
Dependent Claim
27 words
The thin film resistor of claim 1, wherein the percentage of gold in said alloy is less than the percentage of either of the other two metals.
Claim 4
Dependent Claim
22 words
The thin film resistor of claim 1, wherein the percentage of gold in said alloy varies between 10% and 50% by weight.
Claim 5
Dependent Claim
19 words
The thin film resistor of claim 1, wherein said layer of resistive metal is less than 5,000 angstroms thick.
Claim 6
Dependent Claim
15 words
The thin film resistor of claim 4, wherein said film is approximately 200 angstroms thick.
Claim 7
Dependent Claim
20 words
The thin film resistor of claim 1, comprising a thin layer of nickel covering said thin layer of resistive metal.
Claim 8
Dependent Claim
18 words
The thin film resistor of claim 6, comprising a thin layer of gold covering said layer of nickel.
Claim 9
Dependent Claim
19 words
The thin film resistor of claim 7, wherein the weight ratio of chrome to nickel is 3 to 2.
Claim 10
Dependent Claim
25 words
The thin film resistor of claim 1, wherein said predetermined percentages are selected to obtain a TCR of zero parts per million per degree centigrade.
Claim 11
Dependent Claim
34 words
The thin film resistor of claim 9, wherein said weight ratio of chrome to nickel in said alloy is 3 to 2 and the weight percentage of gold of said alloy is approximately 35%.
Claim 12
Dependent Claim
19 words
The thin film resistor of claim 10, wherein said layer of resistive metal is less than 5,000 angstroms thick.
Claim 13
Dependent Claim
20 words
The thin film resistor of claim 11, comprising a thin layer of nickel covering said thin layer of resistive metal.
Claim 14
Dependent Claim
18 words
The thin film resistor of claim 12, comprising a thin layer of gold covering said layer of nickel.
Claim 15
Dependent Claim
19 words
The thin film resistor of claim 4, wherein the weight ratio of chrome to nickel is 3 to 2.
Claim 16
Dependent Claim
23 words
The thin film resistor of claim 14, wherein the weight percentage of gold in said alloy varies between 10% to 50% by weight.
References Cited (Backward Citations)
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Cited
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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) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |