US3187265A
Expired / Lapsed
US
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Amplifier with circuitry for producing a constant input signal level indication
Assignee: US Philips Corp
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Filing: 1960-06-17
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Granted: 1965-06-01
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Expires: 1980-06-17
Abstract
No abstract record available.
Inventors
- 👤 Hermes Willem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/16; H03; H03F; H03F1/00; H03F1/34; H03F1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
AN AMPLIFIER HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, VARIABLE IMPEDANCE LOAD CIRCUIT MEANS, A COMPENSATION RESISTOR, MEANS SERIALLY CONNECTING SAID LOAD CIRCUIT AND COMPENSATION RESISTOR TO SAID OUTPUT CIRCUIT, MEANS CONNECTED BETWEEN SAID LOAD CIRCUIT MEANS AND INPUT CIRCUIT PROVIDING A NEGATIVE FEEDBACK VOLTAGE TO SAID INPUT CIRCUIT, AND SIGNAL LEVEL INDICATING MEANS CONNECTED IN PARALLEL WITH SAID SERIES CONNECTED LOAD CIRCUIT AND RESISTOR, SAID RESISTOR HAVING A VALUE SUBSTANTIALLY EQUAL TO THE EFFECTIVE INTERNAL RESISTANCE OF SAID AMPLIFIER, WHEREBY SIGNAL LEVELS INDICATED BY SAID INDICATING MEANS ARE SUBSTANTIALLY INDEPENDENT OF THE VALUE OF SAID VARIABLE IMPEDANCE LOAD CIRCUIT.
Claim 2
Dependent Claim
101 words
AN AMPLIFIER HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, VARIABLE IMPEDANCE LOAD CIRCUIT MEANS, A COMPENSATION RESISTOR, MEANS SERIALLY CONNECTING SAID LOAD CIRCUIT AND COMPENSATION RESISTOR TO SAID OUTPUT CIRCUIT, MEANS CONNECTED BETWEEN SAID LOAD CIRCUIT MEANS AND INPUT CIRCUIT PROVIDING A NEGATIVE FEEDBACK VOLTAGE TO SAID INPUT CIRCUIT, AND SIGNAL LEVEL INDICATING MEANS CONNECTED IN PARALLEL WITH SAID SERIES CONNECTED LOAD CIRCUIT AND RESISTOR, SAID RESISTOR HAVING A VALUE SUBSTANTIALLY EQUAL TO THE EFFECTIVE INTERNAL RESISTANCE OF SAID AMPLIFIER, WHEREBY SIGNAL LEVELS INDICATED BY SAID INDICATING MEANS ARE SUBSTANTIALLY INDEPENDENT OF THE VALUE OF SAID VARIABLE IMPEDANCE LOAD CIRCUIT.
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) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |