US1823354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed submarine cable telegraph system
Assignee: AT&T Inc
•
Filing: 1929-08-19
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Granted: 1931-09-15
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Expires: 1949-08-19
Abstract
No abstract record available.
Inventors
- 👤 Andrew D Dowd
- 👤 Mark B Kerr
- 👤 George A Locke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:49
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/14; H04L5/18
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) | 1934-09-14 | 1935-03-16 | 1935-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-09-14 | 1939-03-16 | 1939-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-09-14 | 1943-03-16 | 1943-09-15 | $7700.00 | Window Closed / Lapsed |