US3273060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanded scale ammeter including a bridge biased transistor differential amplifier
Assignee: A & M Instr Service Inc
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Filing: 1962-03-13
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Granted: 1966-09-13
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Expires: 1982-03-13
Abstract
No abstract record available.
Inventors
- 👤 Kurt H Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:19
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
AN EXPANDED SCALE AMMETER CIRCUIT COMPRISING A PLURALITY OF IMPEDANCE ELEMENTS COUPLED TOGETHER TO FORM AN IMPEDANCE BRIDGE HAVING FOUR LEGS AND FOUR LEG JUNCTIONS, A TRANSISTOR DIFFERENTIAL AMPLIFIER CIRCUIT HAVING TWO SIGNAL INPUT TERMINALS AND TWO POWER INPUT TERMINALS, SAID AMPLIFIER CIRCUIT CONTAINING A METER, SAID METER BEING ADAPTED TO PRODUCE A METER INDICATION PROPORTIONAL TO THE MAGNITUDE OF CURRENT THERETHROUGH IN ONE DIRECTION OF CURRENT FLOW BUT NOT FOR THE OPPOSITE DIRECTION OF CURRENT FLOW AND ALSO PROPORTIONL TO THE DIFFERENCE OF POTENTIAL BETWEEN SAID TWO SIGNAL INPUT TERMINALS, SAID TWO SIGNAL INPUT TERMINALS BEING COUPLED TO TWO OPPOSING JUNCTIONS OF SAID BRIDGE CIRCUIT, A D.C. VOLTAGE SOURCE COUPLED ACROSS THE OTHER TWO JUNCTIONS OF SAID BRIDGE CIRCUIT AND ACROSS THE POWER INPUT TERMINALS OF SAID AMPLIFIER CIRCUIT, ONE OF SAID BRIDGE LEGS COMPRISNG A LOW IMPEDANCE INPUT SHUNT HAVING AND IMPEDANCE IN THE RANGE OF APPROXIMATELY 0 TO 2 OHMS, SAID LOW IMPEDANCE INPUT SHUNT BEING CONNECTED TO CURRENT INPT TERMINALS TO RECEIVE AN INPUT CURRENT APPLIED DIRECTLY THERETO AND TO
Claim 2
Dependent Claim
174 words
AN EXPANDED SCALE AMMETER CIRCUIT COMPRISING A PLURALITY OF IMPEDANCE ELEMENTS COUPLED TOGETHER TO FORM AN IMPEDANCE BRIDGE HAVING FOUR LEGS AND FOUR LEG JUNCTIONS, A TRANSISTOR DIFFERENTIAL AMPLIFIER CIRCUIT HAVING TWO SIGNAL INPUT TERMINALS AND TWO POWER INPUT TERMINALS, SAID AMPLIFIER CIRCUIT CONTAINING A METER, SAID METER BEING ADAPTED TO PRODUCE A METER INDICATION PROPORTIONAL TO THE MAGNITUDE OF CURRENT THERETHROUGH IN ONE DIRECTION OF CURRENT FLOW BUT NOT FOR THE OPPOSITE DIRECTION OF CURRENT FLOW AND ALSO PROPORTIONL TO THE DIFFERENCE OF POTENTIAL BETWEEN SAID TWO SIGNAL INPUT TERMINALS, SAID TWO SIGNAL INPUT TERMINALS BEING COUPLED TO TWO OPPOSING JUNCTIONS OF SAID BRIDGE CIRCUIT, A D.C. VOLTAGE SOURCE COUPLED ACROSS THE OTHER TWO JUNCTIONS OF SAID BRIDGE CIRCUIT AND ACROSS THE POWER INPUT TERMINALS OF SAID AMPLIFIER CIRCUIT, ONE OF SAID BRIDGE LEGS COMPRISNG A LOW IMPEDANCE INPUT SHUNT HAVING AND IMPEDANCE IN THE RANGE OF APPROXIMATELY 0 TO 2 OHMS, SAID LOW IMPEDANCE INPUT SHUNT BEING CONNECTED TO CURRENT INPT TERMINALS TO RECEIVE AN INPUT CURRENT APPLIED DIRECTLY THERETO AND TO
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |