US3374408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor having constant gain over a broad temperature range
Assignee: United States Atomic Energy Commission
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Filing: 1965-05-21
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Granted: 1968-03-19
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Expires: 1985-05-21
Abstract
No abstract record available.
Inventors
- 👤 Howard H Sander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:14
CPC Classifications
H; H10; H10D; H10D99/00; H10D10/00; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN AN AMPLIFYING CIRCUIT EMPLOYING AS ITS SIGNAL AMPLIFICATION MEANS AN N-P-N SILICON TRANSISTOR, THE METHOD OF ACHIEVING SUBSTANTIALLY CONSTANT CURRENT GAIN OVER A RANGE OF OPERATING TEMPERATURE FROM ABOUT 300* K. TO ABOUT 76* K. CONSISTING IN THE STEPS OF: (1) SELECTING AS SAID SIGNAL AMPLIFICATION MEANS A TRANSISTOR OF THE TYPE DESCRIBED WHOSE CURRENT GAIN, IN A NON-IRRIADIATED STATE, DESCREASES WITH DECREASING OPERATING TEMPERATURE FROM A HIGH POINT AT ABOUT 300* K. TO A VALLEY POINT AT ABOUT 135* K., THEREAFTER INCREASES TO A GAIN PEAK POINT AT ABOUT 76* K. AND THEREAFTER DECREASES TOWARD ZERO;
Claim 2
Dependent Claim
98 words
IN AN AMPLIFYING CIRCUIT EMPLOYING AS ITS SIGNAL AMPLIFICATION MEANS AN N-P-N SILICON TRANSISTOR, THE METHOD OF ACHIEVING SUBSTANTIALLY CONSTANT CURRENT GAIN OVER A RANGE OF OPERATING TEMPERATURE FROM ABOUT 300* K. TO ABOUT 76* K. CONSISTING IN THE STEPS OF: (1) SELECTING AS SAID SIGNAL AMPLIFICATION MEANS A TRANSISTOR OF THE TYPE DESCRIBED WHOSE CURRENT GAIN, IN A NON-IRRIADIATED STATE, DESCREASES WITH DECREASING OPERATING TEMPERATURE FROM A HIGH POINT AT ABOUT 300* K. TO A VALLEY POINT AT ABOUT 135* K., THEREAFTER INCREASES TO A GAIN PEAK POINT AT ABOUT 76* K. AND THEREAFTER DECREASES TOWARD ZERO;
References Cited (Backward Citations)
US3009085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |