US2803744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant energy signaling system
Assignee: AT&T Inc
•
Filing: 1953-08-14
•
Granted: 1957-08-20
•
Expires: 1973-08-14
Abstract
No abstract record available.
Inventors
- 👤 Uriah S Berger
- 👤 John F Laidig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02; H04W84/10; H04W84/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2429607A
Cited
US2330241A
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US2479701A
Cited
US2670435A
Cited
US2649541A
Cited
US2694141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |