US3174111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin-t filter with negative feedback
Assignee: Texas Instruments Inc
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Filing: 1961-07-05
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Granted: 1965-03-16
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Expires: 1981-07-05
Abstract
No abstract record available.
Inventors
- 👤 Lawrence L Grover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:50
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1213; H03H11/1295
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
A FILTER CIRCUIT COMPRISING AN INPUT TERMINAL, AN OUTPUT TERMINAL, A PAIR OF CAPACITORS CONNECTED TOGETHER AT A FIRST JUNCTION POINT AND CONNECTED IN SERIES BETWEEN SAID INPUT AND OUTPUT TERMINALS, A PAIR OF RESISTORS CONNECTED TOGETHER AT A SECOND JUNCTION POINT AND CONNECTED IN SERIES BETWEEN SAID INPUT AND OUTPUT TERMINALS, A RESISTOR CONNECTING SAID FIRST JUNCTION POINT TO A REFERENCE POTENTIAL, A CAPACITOR CONNECTING SAID SECOND JUNCTION POINT TO SAID REFERENCE POTENTIAL, AND MEANS FOR GENERATING A FEEDBACK SIGNAL HAVING AN AMPLITUDE WHICH IS A CONTINUOUS FUNCTION OF THE SIGNAL APPEARING AT SAID OUTPUT TERMINAL, SAID MEANS HAVING AN INPUT CONNECTED TO SAID OUTPUT TERMINAL AND HAVING AN OUTPUT CONNECTED TO SAID FIRST JUNCTION POINT.
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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |