US3267386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two stage direct-coupled transistor amplifier utilizing d. c. positive feedback and d. c.-a. c. negative feedback
Assignee: Ampex Corp
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Filing: 1964-02-06
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Granted: 1966-08-16
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Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Robert L Davis
- 👤 Donald M Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:06
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/181; H03F3/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A PRE-AMPLIFIER CIRCUIT INCLUDING TWO TRANSISTORS, EACH HAVING AN EMITTER, A BASE, AND A COLLECTOR; MEANS COUPLING THE COLLECTOR OF THE FIRST SAID TRANSISTOR TO THE BASE OF THE SECOND SAID TRANSISTOR; DEGENERATIVE D.C. FEEDBACK MEANS COUPLED BETWEEN THE COLLECTOR OF THE SECOND SAID TRANSISTOR AND THE EMITTER OF THE FIRST SAID TRANSISTOR; BIAS CIRCUITRY COUPLED TO THE BASE OF SAID FIRST TRANSISTOR INCLUDING A POWER SUPPLY, A CONNECTION TO GROUND, AND RESISTORS CONNECTED BETWEEN SAID POWER SUPPLY AND THE BASE OF SAID FIRST TRANSISTOR AND BETWEEN THE BASE OF SAID FIRST TRANSISTOR AND SAID CONNECTION TO GROUND; REGENERATIVE D.C. FEEDBACK MEANS COUPLED BETWEEN THE COLLECTOR OF THE SECOND SAID TRANSISTOR AND RESISTIVELY SEPARATED THEREFROM AND TWO POINTS IN SAID BIAS CIRCUITRY RESPECTIVELY ON OPPOSITE SIDES OF THE BASE OF THE FIRST SAID TRANSISTOR; AND DEGENERATIVE A.C. FEEDBACK MEANS COUPLED BETWEEN THE COLLECTOR OF THE SECOND SAID TRANSISTOR AND THE EMITTER OF THE FIRST SAID TRANSISTOR.
Claim 2
Dependent Claim
156 words
A PRE-AMPLIFIER CIRCUIT INCLUDING TWO TRANSISTORS, EACH HAVING AN EMITTER, A BASE, AND A COLLECTOR; MEANS COUPLING THE COLLECTOR OF THE FIRST SAID TRANSISTOR TO THE BASE OF THE SECOND SAID TRANSISTOR; DEGENERATIVE D.C. FEEDBACK MEANS COUPLED BETWEEN THE COLLECTOR OF THE SECOND SAID TRANSISTOR AND THE EMITTER OF THE FIRST SAID TRANSISTOR; BIAS CIRCUITRY COUPLED TO THE BASE OF SAID FIRST TRANSISTOR INCLUDING A POWER SUPPLY, A CONNECTION TO GROUND, AND RESISTORS CONNECTED BETWEEN SAID POWER SUPPLY AND THE BASE OF SAID FIRST TRANSISTOR AND BETWEEN THE BASE OF SAID FIRST TRANSISTOR AND SAID CONNECTION TO GROUND; REGENERATIVE D.C. FEEDBACK MEANS COUPLED BETWEEN THE COLLECTOR OF THE SECOND SAID TRANSISTOR AND RESISTIVELY SEPARATED THEREFROM AND TWO POINTS IN SAID BIAS CIRCUITRY RESPECTIVELY ON OPPOSITE SIDES OF THE BASE OF THE FIRST SAID TRANSISTOR; AND DEGENERATIVE A.C. FEEDBACK MEANS COUPLED BETWEEN THE COLLECTOR OF THE SECOND SAID TRANSISTOR AND THE EMITTER OF THE FIRST SAID TRANSISTOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |