US3243511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier circuit
Assignee: Douglas Aircraft Co Inc
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Filing: 1962-10-01
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Granted: 1966-03-29
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Expires: 1982-10-01
Abstract
No abstract record available.
Inventors
- 👤 Vadim N Erdman
- 👤 Harold R Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:34
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/181; H03F3/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
231 words
AN AMPLIFIER CIRCUIT, COMPRISING: A MICROPHONE; A LOADING RESISTOR CONNECTED IN SREIES WITH SAID MICROPHONE IN A FIRST SERIES COMBINATION; A DIRECT CURRENT POWER SUPPLY CONNECTABLE TO SAID FIRST SERIES COMBINATION FOR ENERGIZING THE SAME; A FIRST TRANSFORMER INCLUDING A PRIMARY WINDING, AND A SECONDARY WINDING; A BLOCKING CAPACITOR CONNECTING THE COMMON JUNCTION BETWEEN SAID LOADING RESISTOR AND MICROPHONE OF SAID FIRST SERIES COMBINATION TO ONE END OF SAID PRIMARY WINDING OF SAID FIRST TRANSFORMER, THE OTHER END OF SAID PRIMARY OF SAID FIRST TRANSFORMER BEING CONNECTED TO THE OTHER END OF SAID MICROPHONE; A FIRST TRANSISTOR INCLUDING A BASE, COLLECTOR AND EMITTER, SAID BASE BEING CONNECTED TO ONE END OF SAID SECONDARY WINDING OF SAID FIRST TRANSFORMER AND SAID EMITTER AND THE OTHER END OF SAID SECONDARY WINDING OF SAID FIRST TRANSFORMER BEING CONNECTED TO SAID OTHER END OF SAID MICROPHONE, AND SAID ONE END OF SAID PRIMARY WINDING OF SAID FIRST TRANSFORMER CONNECTING WITH SAID BLOCKING CAPACITOR BEING OF SIMILAR POLARITY AS SAID ONE END OF SAID SECONDARY WINDING OF SAID FIRST TRANSFORMER CONNECTING WITH SAID BASE OF SAID FIRST TRANSISTOR; A SECOND TRANSFORMER INCLUDING A PRIMARY WINDING, AND A SECONDARY WINDING, SAID COLLECTOR OF SAID FIRST TRANSISTOR BEING CONNECTED TO ONE END OF SAID PRIMARY WINDING OF SAID SECOND TRANSFORMER IN A SECOND SERIES COMBINATION INCLUDING SAID FIRST TRANSISTOR AND SAID PRIMARY WINDING OF SAID SECOND TRANSFORMER, SAID
Claim 2
Dependent Claim
231 words
AN AMPLIFIER CIRCUIT, COMPRISING: A MICROPHONE; A LOADING RESISTOR CONNECTED IN SREIES WITH SAID MICROPHONE IN A FIRST SERIES COMBINATION; A DIRECT CURRENT POWER SUPPLY CONNECTABLE TO SAID FIRST SERIES COMBINATION FOR ENERGIZING THE SAME; A FIRST TRANSFORMER INCLUDING A PRIMARY WINDING, AND A SECONDARY WINDING; A BLOCKING CAPACITOR CONNECTING THE COMMON JUNCTION BETWEEN SAID LOADING RESISTOR AND MICROPHONE OF SAID FIRST SERIES COMBINATION TO ONE END OF SAID PRIMARY WINDING OF SAID FIRST TRANSFORMER, THE OTHER END OF SAID PRIMARY OF SAID FIRST TRANSFORMER BEING CONNECTED TO THE OTHER END OF SAID MICROPHONE; A FIRST TRANSISTOR INCLUDING A BASE, COLLECTOR AND EMITTER, SAID BASE BEING CONNECTED TO ONE END OF SAID SECONDARY WINDING OF SAID FIRST TRANSFORMER AND SAID EMITTER AND THE OTHER END OF SAID SECONDARY WINDING OF SAID FIRST TRANSFORMER BEING CONNECTED TO SAID OTHER END OF SAID MICROPHONE, AND SAID ONE END OF SAID PRIMARY WINDING OF SAID FIRST TRANSFORMER CONNECTING WITH SAID BLOCKING CAPACITOR BEING OF SIMILAR POLARITY AS SAID ONE END OF SAID SECONDARY WINDING OF SAID FIRST TRANSFORMER CONNECTING WITH SAID BASE OF SAID FIRST TRANSISTOR; A SECOND TRANSFORMER INCLUDING A PRIMARY WINDING, AND A SECONDARY WINDING, SAID COLLECTOR OF SAID FIRST TRANSISTOR BEING CONNECTED TO ONE END OF SAID PRIMARY WINDING OF SAID SECOND TRANSFORMER IN A SECOND SERIES COMBINATION INCLUDING SAID FIRST TRANSISTOR AND SAID PRIMARY WINDING OF SAID SECOND TRANSFORMER, SAID
References Cited (Backward Citations)
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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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |