US2401888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryptographic communications system
Assignee: RCA Corp
•
Filing: 1942-06-19
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Granted: 1946-06-11
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Expires: 1962-06-19
Abstract
No abstract record available.
Inventors
- 👤 Smith James Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:50
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/38
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) | 1949-06-10 | 1949-12-10 | 1950-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-10 | 1953-12-10 | 1954-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-10 | 1957-12-10 | 1958-06-11 | $7700.00 | Window Closed / Lapsed |