US3289094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier
Assignee: BK Technologies Corp
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Filing: 1965-06-03
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Granted: 1966-11-29
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Expires: 1985-06-03
Abstract
No abstract record available.
Inventors
- 👤 Young Frink Mansfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:08
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
A DIFFERENCE AMPLIFIER FOR ELECTRICAL SIGNALS, SAID AMPLIFIER PROVIDING AN OUTPUT SIGNAL WHICH IS DEPENDENT UPON THE DIFFERENCE BETWEEN TWO INPUT SIGNALS COMPRISING, IN COMBINATION, FIRST AND SECOND PAIRS OF SIGNALS INPUT TERMINALS FOR CONNECTION TO TWO SEPARATE INPUT SIGNALS, AN AMPLIFIER HAVING A ACTIVE INPUT TERMINAL, AN ACTIVE OUTPUT TERMINAL, AND A REFERENCE TERMINAL, MEANS CONNECTING A FIRST TERMINAL FROM SAID FIRST PAIR OF SIGNAL INPUT TERMINALS TO THE ACTIVE INPUT TERMINAL OF SAID AMPLIFIER, A DIRECT CURRENT VOLTAGE SUPPLY MEANS CONNECTED BETWEEN SAID AMPLIFIER REFERENCE TERMINAL AND SAID AMPLIFIER FOR SUPPLING OPERATING POTENTIALS TO SAID AMPLIFER, A FIRST ELECTRICAL IMPEDANCE, MEANS CONNECTING SAID IMPEDANCE BETWEEN THE ACTIVE OUTPUT TERMINAL OF SAID AMPLIFER AND A SECOND TERMINAL OF SAID SECOND PAIR OF SIGNAL INPUT TERMINALS, A SECOND ELECTRICAL IMPEDANCE, MEANS CONNECTING SAID SECOND IMPEDANCE BETWEEN SAID AMPLIFIER REFERENCE TERMINAL AND A FIRST INPUT TERMINAL OF THE SECOND PAIR OF SIGNAL INPUT TERMINALS, MEANS CONNECTING EACH SAID SECOND INPUT TERMINAL OF SAID FIRST AND SECOND PAIRS OF SIGNAL INPUT TERMINALS AND THE END OF SAID FIRST IMPEDANCE NOT CONNECTE TO SAID AMPLIFIER ACTIVE OUTPUT TERMINAL TO A COMMON REFERENCE POTENTIAL, THE CURRENT FLOWING THROUGH SAID IMPEDANCES BEING DIRECTLY PROPORTIONAL TO THE DIFFERENCE IN THE VOLTAGES APPLIED TO SAID PAIRS OF SIGNAL INPUT TERMINALS.
Claim 2
Dependent Claim
213 words
A DIFFERENCE AMPLIFIER FOR ELECTRICAL SIGNALS, SAID AMPLIFIER PROVIDING AN OUTPUT SIGNAL WHICH IS DEPENDENT UPON THE DIFFERENCE BETWEEN TWO INPUT SIGNALS COMPRISING, IN COMBINATION, FIRST AND SECOND PAIRS OF SIGNALS INPUT TERMINALS FOR CONNECTION TO TWO SEPARATE INPUT SIGNALS, AN AMPLIFIER HAVING A ACTIVE INPUT TERMINAL, AN ACTIVE OUTPUT TERMINAL, AND A REFERENCE TERMINAL, MEANS CONNECTING A FIRST TERMINAL FROM SAID FIRST PAIR OF SIGNAL INPUT TERMINALS TO THE ACTIVE INPUT TERMINAL OF SAID AMPLIFIER, A DIRECT CURRENT VOLTAGE SUPPLY MEANS CONNECTED BETWEEN SAID AMPLIFIER REFERENCE TERMINAL AND SAID AMPLIFIER FOR SUPPLING OPERATING POTENTIALS TO SAID AMPLIFER, A FIRST ELECTRICAL IMPEDANCE, MEANS CONNECTING SAID IMPEDANCE BETWEEN THE ACTIVE OUTPUT TERMINAL OF SAID AMPLIFER AND A SECOND TERMINAL OF SAID SECOND PAIR OF SIGNAL INPUT TERMINALS, A SECOND ELECTRICAL IMPEDANCE, MEANS CONNECTING SAID SECOND IMPEDANCE BETWEEN SAID AMPLIFIER REFERENCE TERMINAL AND A FIRST INPUT TERMINAL OF THE SECOND PAIR OF SIGNAL INPUT TERMINALS, MEANS CONNECTING EACH SAID SECOND INPUT TERMINAL OF SAID FIRST AND SECOND PAIRS OF SIGNAL INPUT TERMINALS AND THE END OF SAID FIRST IMPEDANCE NOT CONNECTE TO SAID AMPLIFIER ACTIVE OUTPUT TERMINAL TO A COMMON REFERENCE POTENTIAL, THE CURRENT FLOWING THROUGH SAID IMPEDANCES BEING DIRECTLY PROPORTIONAL TO THE DIFFERENCE IN THE VOLTAGES APPLIED TO SAID PAIRS OF SIGNAL INPUT 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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |