US3601889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing thin film resistor elements
Assignee: Fujitsu Ltd
•
Filing: 1969-02-26
•
Granted: 1971-08-31
•
Expires: 1989-02-26
Abstract
Abstract Described is a method of manufacturing thin film resistor elements. The method is characterized in that intermediate layers consisting of a metal having a temperature coefficient different from the temperature coefficient of a resistor film and capable of preventing diffusion of the soldering material and readily solderable terminal metal layers are provided on terminal parts of the resistor film and the temperature coefficient of resistance is minutely adjusted by removing parts of said intermediate layers.
Inventors
- 👤 Ryoichi Kaneoya
- 👤 Minoru Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:13
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/18; H01C17/00; H01C17/22; H01C17/232; H01C17/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099; Y10T29/49101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
The method of claim 1, wherein the intermediate layers, consisting of a metal having a temperature coefficient different from the temperature coefficient of a resistor film and capable of preventing diffusion of the soldering material, are overlapped and widely coated on terminal parts of the resistor film; readily solderable terminal metal layers are provided on said intermediate layers so that parts of said intermediate layers that are not overlapped on said resistor film may be exposed and the temperature coefficient of the resistor element is minutely adjusted by removing parts of said exposed intermediate layers.
Claim 2
Dependent Claim
27 words
The method of manufacturing thin film resistor elements of claim 2, wherein nickel-chromium is used as the resistor film and chromium is used as the intermediate layers.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |