Patent US3233177A successfully refreshed from Google Patents.
US3233177A
Expired / Lapsed
US
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Radio frequency receiver gain control system with constant input impedance
Assignee: Bankers Trust Co
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Filing: 1962-09-17
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Granted: 1966-02-01
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Expires: 1982-09-17
Abstract
No abstract record available.
Inventors
- 👤 Charles S Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:12
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0017
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A CONSTANT INPUT RESISTANCE AND CONSTANT AMPLITUDE AMPLIFYING CIRCUIT COMPRISING AN AMPLIFIER HAVING AN INPUT TERMINAL AND AN OUTPUT TERMINAL; TWO SIGNAL INPUT TERMINALS; A FIRST RESISTOR AND A VARIABLE RESISTOR CONNECTED IN SERIES CIRCUIT RELATIONSHIP BETWEEN SAID SIGNAL INPUT TERMINALS, THE JUNCTION OF SAID FIRST RESISTOR AND SAID VARIABLE RESISTOR BEING COUPLED TO SAID AMPLIFIER INPUT TERMINAL; MEANS FOR VARYING THE RESISTANCE OF SAID VARIABLE RESISTOR IN RESPONSE TO A CONTROL SIGNAL; AND DEGENERATIVE FEEDBACK CIRCUIT MEANS INTERCONNECTING SAID AMPLIFIER OUTPUT TERMINAL AND THE ONE OF SAID TWO SIGNAL INPUT TERMINALS CONNECTED TO SAID FIRST RESISTOR FOR MAINTAINING THE EFFECTIVE RESISTANCE BETWEEN SAID TWO TERMINALS SUBSTANTIALLY EQUAL TO THE VALUE OF SAID FIRST RESISTOR.
Claim 2
Dependent Claim
115 words
A CONSTANT INPUT RESISTANCE AND CONSTANT AMPLITUDE AMPLIFYING CIRCUIT COMPRISING AN AMPLIFIER HAVING AN INPUT TERMINAL AND AN OUTPUT TERMINAL; TWO SIGNAL INPUT TERMINALS; A FIRST RESISTOR AND A VARIABLE RESISTOR CONNECTED IN SERIES CIRCUIT RELATIONSHIP BETWEEN SAID SIGNAL INPUT TERMINALS, THE JUNCTION OF SAID FIRST RESISTOR AND SAID VARIABLE RESISTOR BEING COUPLED TO SAID AMPLIFIER INPUT TERMINAL; MEANS FOR VARYING THE RESISTANCE OF SAID VARIABLE RESISTOR IN RESPONSE TO A CONTROL SIGNAL; AND DEGENERATIVE FEEDBACK CIRCUIT MEANS INTERCONNECTING SAID AMPLIFIER OUTPUT TERMINAL AND THE ONE OF SAID TWO SIGNAL INPUT TERMINALS CONNECTED TO SAID FIRST RESISTOR FOR MAINTAINING THE EFFECTIVE RESISTANCE BETWEEN SAID TWO TERMINALS SUBSTANTIALLY EQUAL TO THE VALUE OF SAID FIRST RESISTOR.
References Cited (Backward Citations)
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US3082381A
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US3117287A
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US3027518A
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US3153152A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |