US2597071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal monitoring
Assignee: AT&T Inc
•
Filing: 1948-08-14
•
Granted: 1952-05-20
•
Expires: 1968-08-14
Abstract
No abstract record available.
Inventors
- 👤 Samuel I Cory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1829185A
Cited
US2007371A
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US2132678A
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US2173534A
Cited
US2176742A
Cited
GB437539A
Cited
US2275930A
Cited
US2206453A
Cited
US2206452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |