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Patent US3497727A successfully refreshed from Google Patents.
US3497727A
Expired / Lapsed
US
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Multilayer thin film piezoelectric transducers
Assignee: Westinghouse Electric Corp
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Filing: 1968-03-28
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Granted: 1970-02-24
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Expires: 1988-03-28
Abstract
No abstract record available.
Inventors
- 👤 John De Klerk
- 👤 Eugene F Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:35
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2787777A
Cited
US2984756A
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US3115588A
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US3141100A
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US3271622A
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US3321711A
Cited
US3399314A
Cited
US3325743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |