US2582971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse echo distance and direction finding
Assignee: Individual
•
Filing: 1939-11-10
•
Granted: 1952-01-22
•
Expires: 1959-11-10
Abstract
No abstract record available.
Inventors
- 👤 Francis W Dunmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:06
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/82; G01S13/84; G01S11/00; G01S11/02; G01S5/00; G01S5/02; G01S5/0284; G01S5/0289; G01S5/12
Claims Analysis
Total Claims: 0
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US2423023A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |