Patent US2454777A successfully refreshed from Google Patents.
US2454777A
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US
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Method of manufacturing piezo crystals
Assignee: STC PLC
•
Filing: 1944-12-26
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Granted: 1948-11-30
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Expires: 1964-12-26
Abstract
No abstract record available.
Inventors
- 👤 Cronan Walter Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:44
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/065; Y; Y10; Y10S; Y10S409/00; Y10S409/903; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1092867A
Cited
US1377118A
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US1933373A
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US1990002A
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US2136036A
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US2274332A
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US2354616A
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US2375003A
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US2394610A
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US2383638A
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US2354970A
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US2397300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |