Patent US2542844A successfully refreshed from Google Patents.
US2542844A
Expired / Lapsed
US
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Microwave directive antenna
Assignee: AT&T Inc
•
Filing: 1943-08-14
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Granted: 1951-02-20
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Expires: 1963-08-14
Abstract
No abstract record available.
Inventors
- 👤 Phillip H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:25
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1828705A
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US2118419A
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US2082347A
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US2083242A
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US2112282A
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US2168860A
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US2226479A
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US2237792A
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US2249963A
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US2342721A
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US2422361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |