US3564463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic piezoelectric filter having mass loaded electrodes for resonation regions acoustically coupled together
Assignee: AT&T Inc
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Filing: 1966-06-17
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Granted: 1971-02-16
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Expires: 1986-06-17
Abstract
Abstract ENERGY IS TRANSMITTED OVER A DESIRED BAND BY APPLYING IT TO A PAIR OF ELECTRODES MOUNTED ON A CRYSTAL BODY AND REMOVING IT FROM ANOTHER PAIR OF ELECTRODES MOUNTED ON THE CRYSTAL BODY. THE ELECTRODES HAVE SUFFICIENT MASSES TO CONCENTRATE THICKNESS SHEAR VIBRATIONS IN THE AREAS BETWEEN THE ELECTRODES. THE ELECTRODES ARE SPACED SUFFICIENTLY FAR FROM THE EDGES OF THE BODY SO AS TO SUBSTANTIALLY ELIMINATE THE EFFECTS OF THE EDGES. THE PAIRS OF ELECTRODES ARE SPACED SO AS TO COUPLE THE RESONATORS FORMED BY THE ELECTRODES AND THE BODY, BUT TO LIMIT THE COUPLING BELOW A GIVEN VALUE.
Inventors
- 👤 William D Beaver
- 👤 Roger A Sykes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/566
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |