US3260965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable impedance network employing a junction transistor
Assignee: AT&T Inc
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Filing: 1962-08-07
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Granted: 1966-07-12
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Expires: 1982-08-07
Abstract
No abstract record available.
Inventors
- 👤 Richard L Schmal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:31
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0017; H03G1/0035; H03G1/0082; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN COMBINATION IN A VARIABLE IMPEDANCE CIRCUIT, A TRANSISTOR INCLUDING BASE, EMITTER AND COLLECTOR TERMINALS A COMMON GROUND TERMINAL, MEANS CONNECTED TO SAID TRANSISTOR COLLECTOR AND EMITTER TERMINALS AND SAID GROUND TERMINAL FOR BIASING SAID TRANSISTOR TO ITS SUSTAINING VOLTAGE AND TO COLLECTOR-EMITTER CURRENT WHICH EXCEEDS THE AVALANCHE CURRENT REGION, SAID BIASING MEANS INCLUDING A RELTIVELY HIGH AND A RELATIVELY LOW IMPEDANCE CONNECTION BETWEEN SAID GROUND TERMINAL AND SAID TRANSISTOR EMITTER AND COLLECTOR TERMINALS, RESPECTIVELY, A CONTROL VOLTGE SOURCE CONNECTED TO SAID COLLECTOR TERMINAL, AND MEANS INCLUDING A CAPACITOR AND A RESISTOR IN PARALLEL THEREWITH CONNECTING SAID TRANSISTOR BASE TERMINAL AND SAID GROUND TERMINAL.
Claim 2
Dependent Claim
104 words
IN COMBINATION IN A VARIABLE IMPEDANCE CIRCUIT, A TRANSISTOR INCLUDING BASE, EMITTER AND COLLECTOR TERMINALS A COMMON GROUND TERMINAL, MEANS CONNECTED TO SAID TRANSISTOR COLLECTOR AND EMITTER TERMINALS AND SAID GROUND TERMINAL FOR BIASING SAID TRANSISTOR TO ITS SUSTAINING VOLTAGE AND TO COLLECTOR-EMITTER CURRENT WHICH EXCEEDS THE AVALANCHE CURRENT REGION, SAID BIASING MEANS INCLUDING A RELTIVELY HIGH AND A RELATIVELY LOW IMPEDANCE CONNECTION BETWEEN SAID GROUND TERMINAL AND SAID TRANSISTOR EMITTER AND COLLECTOR TERMINALS, RESPECTIVELY, A CONTROL VOLTGE SOURCE CONNECTED TO SAID COLLECTOR TERMINAL, AND MEANS INCLUDING A CAPACITOR AND A RESISTOR IN PARALLEL THEREWITH CONNECTING SAID TRANSISTOR BASE TERMINAL AND SAID GROUND TERMINAL.
References Cited (Backward Citations)
GB814185A
Cited
US3003122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |