Patent US3222599A successfully refreshed from Google Patents.
US3222599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier metering circuit with temperature compensation
Assignee: Solid State Systems Inc
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Filing: 1961-01-17
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Granted: 1965-12-07
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Expires: 1981-01-17
Abstract
No abstract record available.
Inventors
- 👤 Gewirtz Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:47
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
A METERING CIRCUIT FOR MEASURING A VOLTAGE APPLIED ACROSS TWO INPUT TERMINALS OF SAID CIRCUIT, COMPRISING (A) A CURRENT RESPONSIVE METER HAVING TWO METER TERMINALS; (B) A FIRST TRANSISTOR HAVING A BASE, EMITTER AND COLLECTOR; (C) A SECOND TRANSISTOR HAVING A BASE, EMITTER AND COLLECTOR; (D) A FIRST POTENTIOMETER INCLUDING: (1) A FIRST RESISTOR CONNECTED AT OPPOSITE ENDS TO RESPECTIVE OPPOSITE TERMINALS OF SAID METER, AND (2) A MOVABLE TAPPING ARM ELECTRICALLY CONNECTED TO GROUND AND TO ONE OF SAID INPUT TERMINALS, SAID FIRST POTENTIOMETER SERVING TO ADJUST THE METER TO ZERO READING; (E) A DIRECT CURRENT SOURCE HAVING ONE TERMINAL CONNECTED TO GROUND AND ANOTHER TERMINAL CONNECTED TO THE COLLECTORS OF THE TRANSISTORS; AND (F) A SECOND POTENTIOMETER INCLUDING A SECOND RESISTOR CONNECTED AT OPPOSITE ENDS TO GROUND AND TO THE COLLECTORS AT THE TRANSISTORS, SAID SECOND POTENTIOMETER HAVING A MOVABLE TAPPING ARM CONNECTED TO THE BASE OF THE SECOND TRANSISTOR, THE SAID SECOND POTENTIOMETER PROVIDING A REFERENCE VOLTAGE FROM THE FIRST TRANSISTOR TO THE BASE OF THE SECOND TRANSISTOR; (G) THE EMITTERS TO THE BASE OF THE SECOND TRANBEING CONNECTED RESPECTIVELY TO OPPOSITE TERMINALS
Claim 2
Dependent Claim
186 words
A METERING CIRCUIT FOR MEASURING A VOLTAGE APPLIED ACROSS TWO INPUT TERMINALS OF SAID CIRCUIT, COMPRISING (A) A CURRENT RESPONSIVE METER HAVING TWO METER TERMINALS; (B) A FIRST TRANSISTOR HAVING A BASE, EMITTER AND COLLECTOR; (C) A SECOND TRANSISTOR HAVING A BASE, EMITTER AND COLLECTOR; (D) A FIRST POTENTIOMETER INCLUDING: (1) A FIRST RESISTOR CONNECTED AT OPPOSITE ENDS TO RESPECTIVE OPPOSITE TERMINALS OF SAID METER, AND (2) A MOVABLE TAPPING ARM ELECTRICALLY CONNECTED TO GROUND AND TO ONE OF SAID INPUT TERMINALS, SAID FIRST POTENTIOMETER SERVING TO ADJUST THE METER TO ZERO READING; (E) A DIRECT CURRENT SOURCE HAVING ONE TERMINAL CONNECTED TO GROUND AND ANOTHER TERMINAL CONNECTED TO THE COLLECTORS OF THE TRANSISTORS; AND (F) A SECOND POTENTIOMETER INCLUDING A SECOND RESISTOR CONNECTED AT OPPOSITE ENDS TO GROUND AND TO THE COLLECTORS AT THE TRANSISTORS, SAID SECOND POTENTIOMETER HAVING A MOVABLE TAPPING ARM CONNECTED TO THE BASE OF THE SECOND TRANSISTOR, THE SAID SECOND POTENTIOMETER PROVIDING A REFERENCE VOLTAGE FROM THE FIRST TRANSISTOR TO THE BASE OF THE SECOND TRANSISTOR; (G) THE EMITTERS TO THE BASE OF THE SECOND TRANBEING CONNECTED RESPECTIVELY TO OPPOSITE TERMINALS
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |