Patent US2536771A successfully refreshed from Google Patents.
US2536771A
Expired / Lapsed
US
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Subaqueous sound transmission system for object detection
Assignee: Individual
•
Filing: 1940-10-15
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Granted: 1951-01-02
•
Expires: 1960-10-15
Abstract
No abstract record available.
Inventors
- 👤 Rost Helge Fabian
- 👤 Claesson Per Harry Elias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:13
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/06; G01S15/08; G01S15/32; G01S15/34; G01S15/10; G01S15/101; G01S15/102; G01S15/88; G01S7/00; G01S7/52; G01S7/52004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2206903A
Cited
US1501105A
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US1836397A
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US1972889A
Cited
US2447333A
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US2130912A
Cited
US2151917A
Cited
US2064911A
Cited
US2166991A
Cited
US2410066A
Cited
US2172395A
Cited
US2410067A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |