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Patent US1562950A successfully refreshed from Google Patents.
US1562950A
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Signaling by ultra-audible sound waves
Assignee: Submarine Signal Co
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Filing: 1918-12-14
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Granted: 1925-11-24
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Expires: 1938-12-14
Abstract
No abstract record available.
Inventors
- 👤 Reginald A Fessenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:41
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
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) | 1928-11-23 | 1929-05-25 | 1929-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-11-23 | 1933-05-25 | 1933-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-11-23 | 1937-05-25 | 1937-11-24 | $7700.00 | Window Closed / Lapsed |