US2551848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric crystal and means for and method of controlling its frequency response characteristics
Assignee: Individual
•
Filing: 1948-04-22
•
Granted: 1951-05-08
•
Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Billy E Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:17
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; G; G01; G01H; G01H13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1632150A
Cited
US1848630A
Cited
US1927141A
Cited
US1841459A
Cited
US1886815A
Cited
US2101272A
Cited
US2044000A
Cited
US2083420A
Cited
US2174701A
Cited
US2321285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |