Patent US3588531A successfully refreshed from Google Patents.
US3588531A
Expired / Lapsed
US
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Analog network based on sampling for universal applications filter
Assignee: Sentralinstitutt for Industriell Forskning
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Filing: 1968-11-26
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Granted: 1971-06-28
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Expires: 1988-11-26
Abstract
Abstract THE PRESENT FILTER FOR FILTERING ANALOG SIGNALS IS BASED ON THE USE OF ANALOG NETWORKS IN WHICH THE SIGNALS ARE INTEGRATED OVER TIME SO AS TO SELECT OUT A DESIRED FREQUENCY RANGE, AND IS CHARACTERIZED BY MEANS FOR INTEGRATING THE SIGNALS ONLY OVER SEPARATE TIME INTERVALS, THE MUTUAL TIME SPACING OF WHICH IS SHORTER THAN THE PERIOD OF THE SIGNALS IN SAID DESIRED FREQUENCY RANGE. IN THE CASE OF AN ELECTRICAL FILTER CIRCUIT COMPRISING AT LEAST ONE CAPACITOR THERE IS PROVIDED A SWITCHING ELEMENT EFFECTIVELY IN SERIES WITH EACH CAPACITOR, SAID SWITCHING ELEMENT BEING CLOSED DURING SAID SEPARATE TIME INTERVALS.
Inventors
- 👤 Hakon Einar Bjor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:56
CPC Classifications
H; H03; H03H; H03H19/00; H03H19/008
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |