US3178651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier
Assignee: RTX Corp
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Filing: 1961-08-03
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Granted: 1965-04-13
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Expires: 1981-08-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Kegelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:58
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A DIFFERENTIAL AMPLIFIER INCLUDING IN COMBINATION A PLURALITY OF FIRST AMPLIFIER DEVICES EACH HAVING AN OUTPUT TERMINAL AND A REFERENCE TERMINAL, A CONDUCTOR, RESPECTIVE REFERENCE IMPEDANCES OF EQUAL MAGNITUDE CONNECTING SAID REFERENCE TERMINALS TO SAID CONDUCTOR, COMMON MEANS COMPRISING A SECOND AMPLIFIER DEVICE HAVING A REFERENCE TERMINAL AND A CONTROL TERMINAL AND HAVING AN OUTPUT TERMINAL CONNECTED TO SAID CONDUCTOR, SAID COMMON MEANS HAVING AN OPERATING POINT IMPEDANCE AND HAVING SUCH INCREMENTAL IMPEDANCE VALUE THAT THE OUTPUT IMPEDANCE AT SAID OUTPUT TERMINAL OF SAID SECOND AMPLIFIER DEVICE IS HALF THE MAGNITUDE OF ONE OF SAID REFERENCE IMPEDANCES, MEANS FOR APPLYING A POTENTIAL ACROSS SAID FRIST AMPLIFIER DEVICE OUTPUT TERMINALS AND SAID SECOND AMPLIFIER DEVICE REFERENCE TERMINAL, A SOURCE OF EXTERNAL SIGNAL AND MEANS FOR COUPLING SAID SOURCE TO SAID CONTROL TERMINAL TO CONTROL THE OPERATING POINT OF SAID COMMON IMPEDANCE.
Claim 2
Dependent Claim
140 words
A DIFFERENTIAL AMPLIFIER INCLUDING IN COMBINATION A PLURALITY OF FIRST AMPLIFIER DEVICES EACH HAVING AN OUTPUT TERMINAL AND A REFERENCE TERMINAL, A CONDUCTOR, RESPECTIVE REFERENCE IMPEDANCES OF EQUAL MAGNITUDE CONNECTING SAID REFERENCE TERMINALS TO SAID CONDUCTOR, COMMON MEANS COMPRISING A SECOND AMPLIFIER DEVICE HAVING A REFERENCE TERMINAL AND A CONTROL TERMINAL AND HAVING AN OUTPUT TERMINAL CONNECTED TO SAID CONDUCTOR, SAID COMMON MEANS HAVING AN OPERATING POINT IMPEDANCE AND HAVING SUCH INCREMENTAL IMPEDANCE VALUE THAT THE OUTPUT IMPEDANCE AT SAID OUTPUT TERMINAL OF SAID SECOND AMPLIFIER DEVICE IS HALF THE MAGNITUDE OF ONE OF SAID REFERENCE IMPEDANCES, MEANS FOR APPLYING A POTENTIAL ACROSS SAID FRIST AMPLIFIER DEVICE OUTPUT TERMINALS AND SAID SECOND AMPLIFIER DEVICE REFERENCE TERMINAL, A SOURCE OF EXTERNAL SIGNAL AND MEANS FOR COUPLING SAID SOURCE TO SAID CONTROL TERMINAL TO CONTROL THE OPERATING POINT OF SAID COMMON IMPEDANCE.
References Cited (Backward Citations)
US2930982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |