Surface wave device having alternating remanent polarization between interdigital electrodes,spaced a surface wavelength apart
Abstract
Abstract A SURFACE-WAVE ACOUSTIC DEVICE CHARACTERIZED BY INPUT AND OUTPUT TRANSDUCERS DISPOSED ON A SURFACE OF A PIEZOELECTRIC CERAMIC SUBSTRATE. EACH OF THE TRANSDUCERS IS OF AN INTERDIGITAL TYPE HAVING A PAIR OF COMB-LIKE ELECTRODES EACH OF WHICH HAS PRONG OR FINGER-LIKE ELECTRODES ARRANGED WITH THE FINGERS OR PRONGS OF ONE ELECTRODE DISPOSED BETWEEN THE PRONGS OR FINGERS OF THE OTHER ELECTRODES. THE DEVICE IS PRODUCED BY APPLYING A POLARIZING FIELD TO THE ELECTRODES TO CAUSE THE DIRECTION OF REMANENT POLARIZATION TO EXTEND FROM PRONG TO PRONG OF THE INTERENGAGED ELECTRODES OF EACH TRANSDUCER. THE DISTANCE OF THE PRONGS OF THE COMB-LIKE ELECTRODE FROM EACH OTHER IS EQUAL TO ONE WAVE LENGTH OF THE ACOUSTIC SURFACE WAVE.
Inventors
- 👤 H Thomann
Bibliographic Details
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |