US2454777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing piezo crystals
Assignee: STC PLC
•
Filing: 1944-12-26
•
Granted: 1948-11-30
•
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 13:41
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1092867A
Cited
US1377118A
Cited
US1933373A
Cited
US1990002A
Cited
US2136036A
Cited
US2274332A
Cited
US2354616A
Cited
US2375003A
Cited
US2394610A
Cited
US2383638A
Cited
US2354970A
Cited
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 |