US3237028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logarithmic transfer circuit
Assignee: Individual
•
Filing: 1963-02-21
•
Granted: 1966-02-22
•
Expires: 1983-02-21
Abstract
No abstract record available.
Inventors
- 👤 James F Gibbons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:12
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A LOGARITHMIC TRANSFER CIRCUIT OF THE CHARACTER DESCRIBED COMPRISING AN AMPLIFIER HAVING A PAIR OF INPUT AND A PAIR OF OUTPUT TERMINALS, MEANS FOR APPLYING AN INPUT SIGNAL CURRENT TO SAID TRANSFER CIRCUIT, A FEEDBACK TRANSISTOR HAVING EMITTER, BASE AND COLLECTOR TERMINALS, SAID TRANSISTOR HAVING ITS BASE TERMINAL DIRECTLY CONNECTED TO A POINT WHICH IS COMMON TO ONE OF THE INPUT AND ONE OF THE OUTPUT TERMINALS OF THE AMPLIFIER, ONE OF THE OTHER TERMINALS OF SAID TRANSISTOR BEING DIRECTLY CONNECTED TO THE OTHER INPUT TERMINAL OF THE AMPLIFIER TO SUPPLY A CURRENT OF OPPOSITE POLARITY TO THE INPUT SIGNAL CURRENT AND HAVING SUBSTANTIALLY THE SAME MAGNITUDE AS THE INPUT SIGNAL CURRENT OVER THE ENTIRE RANGE OF SIGNAL CURRENTS, AND THE OTHER TERMINAL OF THE TRANSISTOR CONNECTED TO RECEIVE A VOLTAGE WHICH IS PROPORTIONAL TO THE OUTPUT VOLTAGE OF THE AMPLIFIER WHEREBY THE OUTPUT VOLTAGE IS PROPORTIONAL TO THE LOGARITHM OF THE INPUT CURRENT.
Claim 2
Dependent Claim
154 words
A LOGARITHMIC TRANSFER CIRCUIT OF THE CHARACTER DESCRIBED COMPRISING AN AMPLIFIER HAVING A PAIR OF INPUT AND A PAIR OF OUTPUT TERMINALS, MEANS FOR APPLYING AN INPUT SIGNAL CURRENT TO SAID TRANSFER CIRCUIT, A FEEDBACK TRANSISTOR HAVING EMITTER, BASE AND COLLECTOR TERMINALS, SAID TRANSISTOR HAVING ITS BASE TERMINAL DIRECTLY CONNECTED TO A POINT WHICH IS COMMON TO ONE OF THE INPUT AND ONE OF THE OUTPUT TERMINALS OF THE AMPLIFIER, ONE OF THE OTHER TERMINALS OF SAID TRANSISTOR BEING DIRECTLY CONNECTED TO THE OTHER INPUT TERMINAL OF THE AMPLIFIER TO SUPPLY A CURRENT OF OPPOSITE POLARITY TO THE INPUT SIGNAL CURRENT AND HAVING SUBSTANTIALLY THE SAME MAGNITUDE AS THE INPUT SIGNAL CURRENT OVER THE ENTIRE RANGE OF SIGNAL CURRENTS, AND THE OTHER TERMINAL OF THE TRANSISTOR CONNECTED TO RECEIVE A VOLTAGE WHICH IS PROPORTIONAL TO THE OUTPUT VOLTAGE OF THE AMPLIFIER WHEREBY THE OUTPUT VOLTAGE IS PROPORTIONAL TO THE LOGARITHM OF THE INPUT CURRENT.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |