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US2640193A
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Radiant energy signaling system
Assignee: AT&T Inc
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Filing: 1951-02-27
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Granted: 1953-05-26
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Expires: 1971-02-27
Abstract
No abstract record available.
Inventors
- 👤 Carter Robert William
- 👤 Currier Milton Griffith
- 👤 Emig William George
- 👤 Glentzer Kenneth Verley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:15
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |