Patent US6283981B1 successfully refreshed from Google Patents.
US2649541A
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Radiant energy signaling station
Assignee: AT&T Inc
•
Filing: 1951-02-28
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Granted: 1953-08-18
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Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 Marcellus B Mcdavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/02; H04W76/00; H04W76/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1572756A
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US1619223A
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US1608551A
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US2064896A
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US2064894A
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US2064961A
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US2479701A
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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) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |