Patent US2754492A successfully refreshed from Google Patents.
US2754492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for precision echo ranging
Assignee: Individual
•
Filing: 1953-04-13
•
Granted: 1956-07-10
•
Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Henry W Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:40
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/91; G01S13/913
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2092762A
Cited
US2247662A
Cited
US2420672A
Cited
US2275735A
Cited
US2390187A
Cited
US2355826A
Cited
US2521130A
Cited
US2413116A
Cited
US2418538A
Cited
US2474918A
Cited
US2490968A
Cited
US2634398A
Cited
US2710959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |