Patent US3108019A successfully refreshed from Google Patents.
US3108019A
Expired / Lapsed
US
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Method of stabilizing the electrical resistance of a metal oxide film
Assignee: Corning Glass Works
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Filing: 1958-02-14
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Granted: 1963-10-22
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Expires: 1978-02-14
Abstract
No abstract record available.
Inventors
- 👤 James K Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:06
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/30; C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/245; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/211; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/152; C03C2218/30; C03C2218/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A METHOD OF PRODUCING AN ELECTRICAL RESISTANCE ELEMENT ADAPTED TO OPERATE AT A PREDETERMINED TEMPERATURE WHICH COMPRISES FORMING AN ELECTROCONDUCTIVE METAL OXIDE FILM ON A SUBSTRATE, SUBJECTING THE FILM TO A HIGH TEMPERATURE HEAT TREATMENT THAT IMPARTS AN ABNORMALLY HIGH, UNSTABLE RESISTANCE VALUE TO THE FILM, THEREAFTER ACCELERATING THE RATE AT WHICH THE ELECTRICAL RESISTANCE OF THE FILM DECREASES FROM THE ABNORMALLY HIGH VALUE TO A VALUE THAT IS MORE NEARLY STABLE AT THE INTENDED OPERATING TEMPERATURE BY SUBJECTING THE FILM TO A SECOND HEAT TREATMENT IN A MILDLY REDUCING ATMOSPHERE AND AT A TEMPERATURE INTERMEDIATGE THE INTENDED OPERATING TEMPERATURE OF THE RESISTANCE ELEMENT AND THE TEMPERATURE OF THE INITIAL HEAT TREATMENT, AND DISCONTINUING THIS SECOND HEAT TREATMENT WHEN THE DESIRED ACCELERATED DECREASE HAS BEEN ACHIEVED, THEREBY PRODUCING A RESISTANCE ELEMENT HAVING A MORE STABLE RESISTANCE AT ITS INTENDED OPERATING TEMPERATURE.
Claim 2
Independent Claim
141 words
A METHOD OF PRODUCING AN ELECTRICAL RESISTANCE ELEMENT ADAPTED TO OPERATE AT A PREDETERMINED TEMPERATURE WHICH COMPRISES FORMING AN ELECTROCONDUCTIVE METAL OXIDE FILM ON A SUBSTRATE, SUBJECTING THE FILM TO A HIGH TEMPERATURE HEAT TREATMENT THAT IMPARTS AN ABNORMALLY HIGH, UNSTABLE RESISTANCE VALUE TO THE FILM, THEREAFTER ACCELERATING THE RATE AT WHICH THE ELECTRICAL RESISTANCE OF THE FILM DECREASES FROM THE ABNORMALLY HIGH VALUE TO A VALUE THAT IS MORE NEARLY STABLE AT THE INTENDED OPERATING TEMPERATURE BY SUBJECTING THE FILM TO A SECOND HEAT TREATMENT IN A MILDLY REDUCING ATMOSPHERE AND AT A TEMPERATURE INTERMEDIATGE THE INTENDED OPERATING TEMPERATURE OF THE RESISTANCE ELEMENT AND THE TEMPERATURE OF THE INITIAL HEAT TREATMENT, AND DISCONTINUING THIS SECOND HEAT TREATMENT WHEN THE DESIRED ACCELERATED DECREASE HAS BEEN ACHIEVED, THEREBY PRODUCING A RESISTANCE ELEMENT HAVING A MORE STABLE RESISTANCE AT ITS INTENDED OPERATING TEMPERATURE.
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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |