US3383686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diverse frequency echo detection system with doppler frequency coherence
Assignee: United States Department of the Navy
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Filing: 1967-01-30
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Granted: 1968-05-14
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Expires: 1987-01-30
Abstract
No abstract record available.
Inventors
- 👤 John R Davis
- 👤 James M Headrick
- 👤 Irving H Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:46
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/24; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |