Patent US2846680A successfully refreshed from Google Patents.
US2846680A
Expired / Lapsed
US
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Directive antennas
Assignee: AT&T Inc
•
Filing: 1946-06-29
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Granted: 1958-08-05
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Expires: 1966-06-29
Abstract
No abstract record available.
Inventors
- 👤 Willard D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/192
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR454342A
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US1299397A
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US1990977A
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US2118419A
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DE678010C
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US2249908A
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CH231920A
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US2416675A
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US2409183A
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US2436408A
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US2427005A
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US2421988A
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US2407829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |