Patent US3945400A successfully refreshed from Google Patents.
US2681990A
Expired / Lapsed
US
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Slot array antenna
Assignee: United States Department of the Navy
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Filing: 1946-04-03
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Granted: 1954-06-22
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Expires: 1966-04-03
Abstract
No abstract record available.
Inventors
- 👤 Edward M Purcell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:40
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2235162A
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US2238770A
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US2489288A
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US2402622A
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US2408435A
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US2405242A
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US2414266A
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US2482162A
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US2479209A
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US2501105A
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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) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |