US3108197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feedback control logarithmic amplifier
Assignee: Individual
•
Filing: 1961-02-16
•
Granted: 1963-10-22
•
Expires: 1981-02-16
Abstract
No abstract record available.
Inventors
- 👤 William S Levin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:29
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A FEEDBACK CONTROLLED LOGARITHMIC AMPLIFIER STAGE COMPRISING: A TRANSISTOR AMPLIFIER CIRCUIT INCLUDING FIRST AND SECOND TRANSISTORS, EACH HAVING EMITTER, COLLECTOR, AND BASE ELECTRODE, SAID FIRST TRANSISTOR BEING COLLECTOR-TO-BASE COUPLED TO SAID SECOND TRANSISTOR, THE EMITTER OF THE FIRST TRANSISTOR BEING COUPLED TO AN INPUT TERMINAL AND THE EMITTER OF THE SECOND TRANSISTOR BEING COUPLED TO AN OUTPUT TERMINAL, THE COLLECTOR-TO-BASE COUPLING AND THE BASE OF THE FIRST TRANSITOR BEING COUPLED IN A VOLTAGE DIVIDER CIRCUIT AND THE COLLECTOR OF SAID SECOND TRANSISTOR BEING COUPLED TO FIXED ZERO POTENTIAL; A NEGATIVE FEEDBACK CIRCUIT COUPLING THE OUTPUT TERMINAL OF THE SECOND TRANSISTOR TO THE BASE OF SAID FIRST TRANSISTOR, SAID FEEDBACK CIRCUIT INCLUDING A PLURALITY OF DIODES IN PARALLEL AND EACH BIASED AT A DIFFERENT
Claim 2
Dependent Claim
123 words
A FEEDBACK CONTROLLED LOGARITHMIC AMPLIFIER STAGE COMPRISING: A TRANSISTOR AMPLIFIER CIRCUIT INCLUDING FIRST AND SECOND TRANSISTORS, EACH HAVING EMITTER, COLLECTOR, AND BASE ELECTRODE, SAID FIRST TRANSISTOR BEING COLLECTOR-TO-BASE COUPLED TO SAID SECOND TRANSISTOR, THE EMITTER OF THE FIRST TRANSISTOR BEING COUPLED TO AN INPUT TERMINAL AND THE EMITTER OF THE SECOND TRANSISTOR BEING COUPLED TO AN OUTPUT TERMINAL, THE COLLECTOR-TO-BASE COUPLING AND THE BASE OF THE FIRST TRANSITOR BEING COUPLED IN A VOLTAGE DIVIDER CIRCUIT AND THE COLLECTOR OF SAID SECOND TRANSISTOR BEING COUPLED TO FIXED ZERO POTENTIAL; A NEGATIVE FEEDBACK CIRCUIT COUPLING THE OUTPUT TERMINAL OF THE SECOND TRANSISTOR TO THE BASE OF SAID FIRST TRANSISTOR, SAID FEEDBACK CIRCUIT INCLUDING A PLURALITY OF DIODES IN PARALLEL AND EACH BIASED AT A DIFFERENT
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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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |