US3559114A
Expired / Lapsed
US
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Filter arrangement consisting of a ladder network of reactances and a terminating resistance and signal sources connected to a series element on the input side of the filter and to one or more shunt elements in said ladder network
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1968-09-03
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Granted: 1971-01-26
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Expires: 1988-09-03
Abstract
Abstract A FILTER COMPRISES A LADDER NETWORK OF REACTANCES CONNECTED BETWEEN A SIGNAL INPUT AND A TERMINATING RESIST*OR. ONE TYPE OF REACTANCE SERIALLY CONNECTS THE SIGNAL INPUT TO THE TERMINATING RESISTOR, THE SECOND TYPE EXTENDS FROM THE JUNCTIONS OF SERIALLY CONNECTED REACTANCES. A PORTION OF THE INPUT SIGNAL IS FED TO THE FREE END OF AT LEAST SOME OF THE REACTANCES OF THE SECOND TYPE. THE MAGNITUDES OF THE REACTANCES AND THE REQUIRED PORTIONS OF THE INPUT SIGNAL ARE CHOSEN IN ACCORDANCE WITH THE DESIRED TRANSFER CHARACTERISTIC.
Inventors
- 👤 Tore Torstensson Fjallbrant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:22
CPC Classifications
F; F16; F16K; F16K21/00; B; B67; B67D; B67D1/00; B67D1/08; B67D1/0829; B67D1/0831; B67D1/0832; H; H03; H03H; H03H7/00; H03H7/01; H03H7/0115; H03H7/075
Claims Analysis
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References Cited (Backward Citations)
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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) | 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 |