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US3170125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controller circuitry
Assignee: Westinghouse Electric Corp
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Filing: 1959-12-18
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Granted: 1965-02-16
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Expires: 1979-12-18
Abstract
No abstract record available.
Inventors
- 👤 Francis T Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:00
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/08; G; G05; G05B; G05B5/00; G05B5/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
IN A DIFFERENTIAL AMPLIFIER WHEREIN EACH OF FIRST AND SECOND AMPLIFIER CHANNELS INCLUDES A TRANSISTOR HAVING RESPECTIVE EMITTER, BASE, AND COLLECTOR ELECTRODES, A CIRCUIT COMMONLY CONNECTED TO SAID EMITTER ELECTRODES FOR SUPPLYING SUBSTANTIALLY CONSTANT CURRENT TO SAID EMITTER ELECTRODES IN PARALLEL, AND CLAMP MEANS FOR MAINTAINING A REVERSE BIAS ACROSS THE COLLECTOR-BASE JUNCTION OF EACH OF SAID TRANSISTORS.
References Cited (Backward Citations)
US2748272A
Cited
US2867763A
Cited
US2891726A
Cited
US2990516A
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US2951212A
Cited
US3010078A
Cited
US3074020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |