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Patent US2694141A successfully refreshed from Google Patents.
US2694141A
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Radiant energy signaling system
Assignee: AT&T Inc
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Filing: 1951-12-22
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Granted: 1954-11-09
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Expires: 1971-12-22
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Doren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:08
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/06; H04W24/00; H04W84/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-08 | 1958-05-10 | 1958-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-08 | 1962-05-10 | 1962-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-08 | 1966-05-10 | 1966-11-09 | $7700.00 | Window Closed / Lapsed |