Patent US2904682A successfully refreshed from Google Patents.
US2904682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency ratio detector
Assignee: Lockheed Martin Corp
•
Filing: 1955-08-22
•
Granted: 1959-09-15
•
Expires: 1975-08-22
Abstract
No abstract record available.
Inventors
- 👤 Robert E Rawlins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:11
CPC Classifications
G; G08; G08C; G08C15/00; G08C15/02; G08C15/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2534233A
Cited
US2421018A
Cited
US2432204A
Cited
US2489302A
Cited
US2555175A
Cited
US2681414A
Cited
US2702857A
Cited
US2529666A
Cited
US2492736A
Cited
US2742591A
Cited
US2651753A
Cited
US2774872A
Cited
US2775693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |