Patent US3380018A successfully refreshed from Google Patents.
US3380018A
Expired / Lapsed
US
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Digital density threshold for sonar
Assignee: United States Department of the Navy
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Filing: 1967-03-20
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Granted: 1968-04-23
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Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 Woodrow H Littrell
- 👤 Robert D Isaak
- 👤 William E Klund
- 👤 Ronald K Betsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:32
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/52; G01S7/523; G01S7/526; G01S7/527; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3214754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |