US2779191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminator employing multiply resonant piezoelectric vibrator
Assignee: AT&T Inc
•
Filing: 1950-10-28
•
Granted: 1957-01-29
•
Expires: 1970-10-28
Abstract
No abstract record available.
Inventors
- 👤 Gerald W Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:05
CPC Classifications
G; G01; G01B; G01B17/00; G01B17/02; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1416550A
Cited
US1548260A
Cited
US2084201A
Cited
US2185693A
Cited
US2308360A
Cited
US2224700A
Cited
US2461543A
Cited
US2423459A
Cited
US2455389A
Cited
US2541067A
Cited
US2431234A
Cited
US2418964A
Cited
US2447061A
Cited
US2496295A
Cited
US2505515A
Cited
US2540505A
Cited
US2446835A
Cited
US2467325A
Cited
US2495168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |