US2924658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous electronic multiplex telegraph ciphering system
Assignee: AT&T Teletype Corp
•
Filing: 1957-07-09
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Granted: 1960-02-09
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Expires: 1977-07-09
Abstract
No abstract record available.
Inventors
- 👤 Ransom D Slayton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:02
CPC Classifications
G; G09; G09C; G09C1/00; H; H04; H04L; H04L9/00; H04L9/12; H04L2209/00; H04L2209/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2406829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |