Patent US2471284A successfully refreshed from Google Patents.
US2471284A
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Directive antenna system
Assignee: AT&T Inc
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Filing: 1945-05-25
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Granted: 1949-05-24
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Expires: 1965-05-25
Abstract
No abstract record available.
Inventors
- 👤 Wilton T Rea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:29
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/29; H01Q21/293; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/17; H01Q19/175; H01Q21/06; H01Q21/22; H01Q3/00; H01Q3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1908595A
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US1808867A
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US2033390A
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US2095083A
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US2354254A
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US2342721A
Cited
US2424982A
Cited
US2411034A
Cited
US2416155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |