US3422366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant current differential amplifier with current sensing and feedback networks
Assignee: Honeywell Inc
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Filing: 1966-05-31
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Granted: 1969-01-14
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Expires: 1986-05-31
Abstract
No abstract record available.
Inventors
- 👤 Wesley C Sewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:42
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3081; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A CONTROL CIRCUIT FOR DRIVING A DC LOAD WITH A CURRENT WHICH IS PROPORTIONAL TO THE VOLTAGE AT THE INPUT OF THE CIRCUIT, SAID CONTROL CIRCUIT COMPRISING: FIRST AND SECOND OUTPUT TERMINALS FOR CONNECTION TO A DC LOAD; AN INPUT STAGE COMPRISING A DIFFERENTIAL AMPLIFIER HAVING FIRST AND SECOND INPUTS, AND FIRST AND SECOND OUTPUTS, SAID FIRST INPUT BEING ADAPTED TO RECEIVE AN INPUT SIGNAL AND SAID SECOND INPUT BEING CONNECTED THROUGH AN IMPEDANCE TO A POINT OF REFERENCE POTENTIAL; FIRST AND SECOND SUBSTANTIALLY EQUAL CURRENT SENSING RESISTORS EACH HAVING FIRST AND SECOND ENDS; MEANS CONNECTING THE FIRST END OF SAID FIRST CURRENT SENSING RESISTOR TO SAID FIRST OUTPUT OF SAID DIFFERENTIAL AMPLIFIER AND MEANS CONNECTING THE SECOND END OF SAID FIRST SENSING RESISTOR TO SAID FIRST OUTPUT TERMINAL; MEANS CONNECTING THE FIRST END OF SAID SECOND CURRENT SENSING RESISTOR TO SAID SECOND OUTPUT OF SAID DIFFERENTIAL AMPLIFIER AND MEANS CONNECTING THE SECOND END OF SAID SECOND SENSING RESISTOR TO SAID SECOND OUTPUT TERMINAL;
Claim 2
Dependent Claim
164 words
A CONTROL CIRCUIT FOR DRIVING A DC LOAD WITH A CURRENT WHICH IS PROPORTIONAL TO THE VOLTAGE AT THE INPUT OF THE CIRCUIT, SAID CONTROL CIRCUIT COMPRISING: FIRST AND SECOND OUTPUT TERMINALS FOR CONNECTION TO A DC LOAD; AN INPUT STAGE COMPRISING A DIFFERENTIAL AMPLIFIER HAVING FIRST AND SECOND INPUTS, AND FIRST AND SECOND OUTPUTS, SAID FIRST INPUT BEING ADAPTED TO RECEIVE AN INPUT SIGNAL AND SAID SECOND INPUT BEING CONNECTED THROUGH AN IMPEDANCE TO A POINT OF REFERENCE POTENTIAL; FIRST AND SECOND SUBSTANTIALLY EQUAL CURRENT SENSING RESISTORS EACH HAVING FIRST AND SECOND ENDS; MEANS CONNECTING THE FIRST END OF SAID FIRST CURRENT SENSING RESISTOR TO SAID FIRST OUTPUT OF SAID DIFFERENTIAL AMPLIFIER AND MEANS CONNECTING THE SECOND END OF SAID FIRST SENSING RESISTOR TO SAID FIRST OUTPUT TERMINAL; MEANS CONNECTING THE FIRST END OF SAID SECOND CURRENT SENSING RESISTOR TO SAID SECOND OUTPUT OF SAID DIFFERENTIAL AMPLIFIER AND MEANS CONNECTING THE SECOND END OF SAID SECOND SENSING RESISTOR TO SAID SECOND OUTPUT TERMINAL;
References Cited (Backward Citations)
US3371286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |