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US3018198A
Expired / Lapsed
US
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Film resistor and method of making same
Assignee: Resistance Products Co
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Filing: 1959-08-13
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Granted: 1962-01-23
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Expires: 1979-08-13
Abstract
No abstract record available.
Inventors
- 👤 Earl R Olson
- 👤 Charles M Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:22
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/006; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A METHOD OF MANUFACTURING FILM-TYPE RESISTORS WHICH COMPRISES: EVAPORATING IN VACUUM AT A TEMPERATURE OF AT LEAST 2000*C. A METALLIC CHARGE ONTO AN INSULATING BASE TO FORM A METALIC FILM ON SAID BASE, SAID FILM HAVING A THICKNESS OF FROM ABOUT 50 ANGSTROMS TO ABOUT 1500 ANGSTROMS, AND SAID METALLIC CHARGE CONSISTING ESSENTIALLY OF FROM ABOUT 10 PERCENT TO ABOUT 75 PERCENT COPPER, BY WEIGHT, THE BALANCE PLATINUM; AND HEAT-TREATING SAID FILM IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE OF FROM ABOUT 150*C. FOR AT LEAST ABOUT ONE HOUR TO ABOUT 350*C. FOR AT LEAST ABOUT ONE MINUTE.
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) | 1965-01-22 | 1965-07-24 | 1966-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-22 | 1969-07-24 | 1970-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-22 | 1973-07-24 | 1974-01-23 | $7700.00 | Window Closed / Lapsed |