Patent US2878451A successfully refreshed from Google Patents.
US2878451A
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Piezolelectric resonator
Assignee: Mackay Radio & Telegraph Co
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Filing: 1954-03-25
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Granted: 1959-03-17
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Expires: 1974-03-25
Abstract
No abstract record available.
Inventors
- 👤 Butterworth John William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:52
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03C; H03C1/00; H03C1/46; H03H9/46; H03H9/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2229296A
Cited
US2514080A
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US2592703A
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US2540412A
Cited
US2503831A
Cited
US2573168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |