Patent US2690508A successfully refreshed from Google Patents.
US2690508A
Expired / Lapsed
US
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Directive antenna system
Assignee: AT&T Inc
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Filing: 1947-01-10
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Granted: 1954-09-28
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Expires: 1967-01-10
Abstract
No abstract record available.
Inventors
- 👤 Cassius C Cutler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:21
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/12; H01Q13/00; H01Q13/02; H01Q13/0208; H01Q13/0225; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/18; H01Q19/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2156653A
Cited
US2270965A
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US2409183A
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US2436408A
Cited
US2434253A
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US2408373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |