Patent US3395357A successfully refreshed from Google Patents.
US3395357A
Expired / Lapsed
US
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Automatic gain control system
Assignee: AT&T Inc
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Filing: 1966-09-22
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Granted: 1968-07-30
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Expires: 1986-09-22
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Ketchledge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:30
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0017
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
AN AUTOMATIC GAIN CONTROL SYSTEM COMPRISING AN AMPLIFIER INCLUDING A FIRST TRANSISTOR CONNECTED IN A COMMON EMITTER CONFIGURATION, A SOURCE OF AUTOMATIC GAIN CONTROL VOLTAGE, A SOURCE OF DIRECT CURRENT ENERGIZING POTENTIAL, A SECOND TRANSISTOR, MEANS TO REVERSE BIAS SAID SECOND TRANSISTOR INTO A NONCONDUCTING STATE, SAID SECOND TRANSISTOR HAVING COLLECTOR AND EMITTER ELECTRODES RESPECTIVELY CONNECTED TO SAID SOURCE OF DIRECT CURRENT ENERGIZING POTENTIAL AND THE BASE ELECTRODE OF SAID FIRST TRANSISTOR, MEANS TO OVERCOME SAID REVERSE BIAS INCLUDING MEANS TO APPLY SAID AUTOMATIC GAIN CONTROL VOLTAGE TO THE BASE ELECTRODE OF SAID SECOND TRANSISTOR, THE OPERATING POINT OF SAID SECOND TRANSISTOR BEING SHIFTED INTO AN ACTIVE CONDUCTION STATE IN RESPONSE TO A PRESELECTED MAGNITUDE OF SAID AUTOMATIC GAIN CONTROL VOLTAGE, AND THE COLLECTOR EMITTER PATH OF SAID SECOND TRANSISTOR IN SAID CONDUCTION STATE ENABLING THE APPLICATION OF A SUFFICIENT MAGNITUDE OF SAID DIRECT CURRENT ENERGIZING POTENTIAL TO THE BASE ELECTRODE OF SAID FIRST TRANSISTOR TO SHIFT THE OPERATING POINT OF SAID FIRST TRANSISTOR INTO THE SATURATION REGION.
Claim 2
Dependent Claim
168 words
AN AUTOMATIC GAIN CONTROL SYSTEM COMPRISING AN AMPLIFIER INCLUDING A FIRST TRANSISTOR CONNECTED IN A COMMON EMITTER CONFIGURATION, A SOURCE OF AUTOMATIC GAIN CONTROL VOLTAGE, A SOURCE OF DIRECT CURRENT ENERGIZING POTENTIAL, A SECOND TRANSISTOR, MEANS TO REVERSE BIAS SAID SECOND TRANSISTOR INTO A NONCONDUCTING STATE, SAID SECOND TRANSISTOR HAVING COLLECTOR AND EMITTER ELECTRODES RESPECTIVELY CONNECTED TO SAID SOURCE OF DIRECT CURRENT ENERGIZING POTENTIAL AND THE BASE ELECTRODE OF SAID FIRST TRANSISTOR, MEANS TO OVERCOME SAID REVERSE BIAS INCLUDING MEANS TO APPLY SAID AUTOMATIC GAIN CONTROL VOLTAGE TO THE BASE ELECTRODE OF SAID SECOND TRANSISTOR, THE OPERATING POINT OF SAID SECOND TRANSISTOR BEING SHIFTED INTO AN ACTIVE CONDUCTION STATE IN RESPONSE TO A PRESELECTED MAGNITUDE OF SAID AUTOMATIC GAIN CONTROL VOLTAGE, AND THE COLLECTOR EMITTER PATH OF SAID SECOND TRANSISTOR IN SAID CONDUCTION STATE ENABLING THE APPLICATION OF A SUFFICIENT MAGNITUDE OF SAID DIRECT CURRENT ENERGIZING POTENTIAL TO THE BASE ELECTRODE OF SAID FIRST TRANSISTOR TO SHIFT THE OPERATING POINT OF SAID FIRST TRANSISTOR INTO THE SATURATION REGION.
References Cited (Backward Citations)
US3360735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |