US3072868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin t filter
Assignee: International Research and Development Co Ltd
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Filing: 1960-02-10
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Granted: 1963-01-08
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Expires: 1980-02-10
Abstract
No abstract record available.
Inventors
- 👤 Eugene R Lucka
- 👤 Glen H Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:26
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1295
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
AN ELECTRICAL FILTER COMPRISING A PAIR OF SYMMETRICAL T NETWORKS CONNECTED IN SEPARATE PATHS BETWEEN A PAIR OF COMMON INPUT TERMINALS AND A PAIR OF COMMON OUTPUT TERMINALS, ONE OF SAID NETWORKS CONSISTING OF TWO SERIES RESISTANCES AND A SHUNT CAPACITY, AND THE OTHER OF SAID NETWORKS CONSISTING OF TWO SERIES CAPACITIES AND A SHUNT RESISTANCE, SAID CAPACITIES AND RESISTANCES BEING PROPORTIONED TO PROVIDE MAXIMUM ATTENUATION IN THE FILTER AT A PREDETERMINED FREQUENCY, ONE OF SAID SERIES CONNECTED RESISTANCES CONNECTED TO ONE OF SAID OUTPUT TERMINALS BEING VARIABLE TO PROVIDE VARIATION IN SAID PREDETERMINED FREQUENCY, THE REMAINING SERIES AND SHUNT RESISTORS BEING OF A FIXED VALUE, SAID SERIES CONNECTED CAPACITIES BEING CONNECTED TO INPUT AND OUTPUT TERMINALS AND RESPECTIVELY DESIGNATED C1 AND C2, SAID SHUNT CAPACITY BEING DESIGNATED C3, SAID SERIES CONNECTED RESISTORS BEING CONNECTED TO INPUT AND OUTPUT TERMINALS AND RESPECTIVELY DESIGNATED R1 AND R2, BEING VARIABLE, SAID SHUNT RESISTOR BEING DESIGNATED R3, AND R2 BEING ALWAYS CONSIDERABLY GREATER THAN R1, AND
Claim 2
Dependent Claim
163 words
AN ELECTRICAL FILTER COMPRISING A PAIR OF SYMMETRICAL T NETWORKS CONNECTED IN SEPARATE PATHS BETWEEN A PAIR OF COMMON INPUT TERMINALS AND A PAIR OF COMMON OUTPUT TERMINALS, ONE OF SAID NETWORKS CONSISTING OF TWO SERIES RESISTANCES AND A SHUNT CAPACITY, AND THE OTHER OF SAID NETWORKS CONSISTING OF TWO SERIES CAPACITIES AND A SHUNT RESISTANCE, SAID CAPACITIES AND RESISTANCES BEING PROPORTIONED TO PROVIDE MAXIMUM ATTENUATION IN THE FILTER AT A PREDETERMINED FREQUENCY, ONE OF SAID SERIES CONNECTED RESISTANCES CONNECTED TO ONE OF SAID OUTPUT TERMINALS BEING VARIABLE TO PROVIDE VARIATION IN SAID PREDETERMINED FREQUENCY, THE REMAINING SERIES AND SHUNT RESISTORS BEING OF A FIXED VALUE, SAID SERIES CONNECTED CAPACITIES BEING CONNECTED TO INPUT AND OUTPUT TERMINALS AND RESPECTIVELY DESIGNATED C1 AND C2, SAID SHUNT CAPACITY BEING DESIGNATED C3, SAID SERIES CONNECTED RESISTORS BEING CONNECTED TO INPUT AND OUTPUT TERMINALS AND RESPECTIVELY DESIGNATED R1 AND R2, BEING VARIABLE, SAID SHUNT RESISTOR BEING DESIGNATED R3, AND R2 BEING ALWAYS CONSIDERABLY GREATER THAN R1, AND
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |