US2147649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound transmitting and receiving apparatus
Assignee: Submarine Signal Co
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Filing: 1936-04-22
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Granted: 1939-02-21
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Expires: 1956-04-22
Abstract
No abstract record available.
Inventors
- 👤 Haines Kenneth Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/35; G10K11/352; G10K11/355
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-02-20 | 1942-08-22 | 1943-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-02-20 | 1946-08-22 | 1947-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-02-20 | 1950-08-22 | 1951-02-21 | $7700.00 | Window Closed / Lapsed |