Patent US4271835A successfully refreshed from Google Patents.
US3566313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave filter of the complex fork type
Assignee: NEC Corp
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Filing: 1968-05-22
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Granted: 1971-02-23
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Expires: 1988-05-22
Abstract
Abstract A WAVE FILTER IS DISCRIBED WHEREIN A COMPLEX TUNING FORK STRUCTURE IS FORMED BY PAIRS OF CANTILEVER MOUNTED RESONATING PLATES MOUNTED TO A BASE. AT LEAST TWO PAIR OF RESONATING PLATES ARE PROVIDED WHICH RESONATE RESPECTIVELY AT THE SAME FREQUENCY BUT WITH OPPOSITE PHASE. THE PLATES ARE DRIVEN BY TRANSDUCER ELEMENTS SELECTIVELY AFFIXED TO THE PLATES WITH SIMILAR TRANSDUCERS USED TO DETECT THE COMPLES WAVE VIBRATIONS INDUCED IN THE STRUCTURE TO PRO- VIDE AN ELECTRICAL SIGNAL WHICH IS ATTENUATED ACCORDING TO THE PASS BAND RESPONSE OF THE FILTER.
Inventors
- 👤 Tasuku Yuki
- 👤 Takayuki Kawana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:10
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/70; H03H9/46; H03H9/54; H03H9/56
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |