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Patent US2638546A successfully refreshed from Google Patents.
US2638546A
Expired / Lapsed
US
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Pillbox antenna
Assignee: United States Department of the Navy
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Filing: 1946-03-14
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Granted: 1953-05-12
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Expires: 1966-03-14
Abstract
No abstract record available.
Inventors
- 👤 Chu Lan Jen
- 👤 Marion A Taggart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:02
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/13; H01Q19/138
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2283935A
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US2223224A
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US2398095A
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US2405242A
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US2407068A
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US2436408A
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US2452202A
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US2479673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |