Patent US2424549A successfully refreshed from Google Patents.
US2424549A
Expired / Lapsed
US
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Submarine signal detector or receiver
Assignee: AT&T Inc
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Filing: 1943-07-14
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Granted: 1947-07-29
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Expires: 1963-07-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Black
- 👤 Frank F Romanow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US768568A
Cited
US1129565A
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US1101830A
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US1393471A
Cited
US1869178A
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US2104433A
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US2086649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |