US3219480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making thermistors and article
Assignee: General Electric Co
•
Filing: 1961-06-29
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Granted: 1965-11-23
•
Expires: 1981-06-29
Abstract
No abstract record available.
Inventors
- 👤 Roland T Girard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:47
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/24997
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD FOR THE PREPARATION OF A THERMISTOR IN SITU WHICH COMPRISES SUSPENDING A POWDERED COMBINED OXIDE CONSISTING ESSENTIALLY OF FROM ABOUT 40 TO 85 PERCENT BY WEIGHT MANGANESE DIOXIDE, UP TO 55 PERCENT COBALT OXIDE, UP TO 20 PERCENT NICKEL OXIDE, AND UP TO 15 PERCENT COPPER OXIDE HAVING A NEGATIVE TEMPERATURE COEFFICIENT OF RESISTANCE IN A HEATED GAS STREAM AT TEMPEATURES AT LEAST ABOVE THE SINTERING TEMPERATURE OF THE COMBINED OXIDE, HEATING THE POWDERED OXIDE TO THE SINTERING TEMPERATURE, AND DEPOSITING THE POWDERED OXIDE ON A SUBSTRATE TO FORM A UNITARY SINTERED MASS.
Claim 2
Independent Claim
95 words
A METHOD FOR THE PREPARATION OF A THERMISTOR IN SITU WHICH COMPRISES SUSPENDING A POWDERED COMBINED OXIDE CONSISTING ESSENTIALLY OF FROM ABOUT 40 TO 85 PERCENT BY WEIGHT MANGANESE DIOXIDE, UP TO 55 PERCENT COBALT OXIDE, UP TO 20 PERCENT NICKEL OXIDE, AND UP TO 15 PERCENT COPPER OXIDE HAVING A NEGATIVE TEMPERATURE COEFFICIENT OF RESISTANCE IN A HEATED GAS STREAM AT TEMPEATURES AT LEAST ABOVE THE SINTERING TEMPERATURE OF THE COMBINED OXIDE, HEATING THE POWDERED OXIDE TO THE SINTERING TEMPERATURE, AND DEPOSITING THE POWDERED OXIDE ON A SUBSTRATE TO FORM A UNITARY SINTERED MASS.
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |