US3573960A
Expired / Lapsed
US
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Torsional mode elastic wave transducers
Assignee: AT&T Inc
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Filing: 1968-12-19
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Granted: 1971-04-06
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Expires: 1988-12-19
Abstract
Abstract A METHOD OF FORMING TORSIONAL MODE ELASTIC WAVE TRANSDUCERS BY EVAPORATING OR OTHERWISE DEPOSITING PIEZOELECTRIC MATERIAL ON AN END SURFACE OF A DELAY LINE AT AN ANGLE TO THIS SURFACE WHILE THE LINE IS ROTATING. THE MATERIAL FORMS A RING WITH THE PIEZOELECTRIC POLARIZATION AND DIRECTION OF SHEAR MOTION CIRCUMFERENTIAL TO SAID RING. D R A W I N G
Inventors
- 👤 Robert S Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:54
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; G; G01; G01H; G01H1/00; G01H1/10
Claims Analysis
Total Claims: 0
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |