Patent US3559113A successfully refreshed from Google Patents.
US3559113A
Expired / Lapsed
US
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Filters utilizing ladder networks
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1968-09-23
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Granted: 1971-01-26
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Expires: 1988-09-23
Abstract
Abstract A FILTER COMPRISES A PLURALITY OF CAPACITORS CONNECTED IN SERIES BETWEEN A SIGNAL SOURCE AND THE INPUT OF AN AMPLIFIER. A PLURALITY OF RESISTORS EACH HAVING ONE TERMINAL CONNECTED TO A DIFFERENT JUNCTION OF ADJACENT CAPACITORS, AND TO THE JUNCTION OF AN END CAPACITOR AND THE INPUT OF THE AMPLIFIER. THE OTHER ENDS OF ALTERNATE RESISTORS INCLUDING THE RESISTOR CONNECTED TO THE AMPLIFIER JUNCTION RECEIVE SIGNALS RELATED TO THE SIGNAL SOURCE, AND THE OTHER END OF EACH OF THE REMAINING RESISTORS IS CONNECTED TO THE OUTPUT OF THE AMPLIFIER.
Inventors
- 👤 Tore Torstensson Fjallbrant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:37
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1213; H03H11/26; H03H11/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |