Patent US2423119A successfully refreshed from Google Patents.
US2423119A
Expired / Lapsed
US
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Hydrophone selecting system
Assignee: AT&T Inc
•
Filing: 1943-11-08
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Granted: 1947-07-01
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Expires: 1963-11-08
Abstract
No abstract record available.
Inventors
- 👤 John B Retallack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:43
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US760399A
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US743512A
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US1501109A
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US1499766A
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US1704736A
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US1820354A
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GB314112A
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US2289830A
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US2278410A
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US2352742A
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US2347108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |