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Patent US2703840A successfully refreshed from Google Patents.
US2703840A
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US
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Multifrequency antenna array
Assignee: Individual
•
Filing: 1951-02-09
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Granted: 1955-03-08
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Expires: 1971-02-09
Abstract
No abstract record available.
Inventors
- 👤 Gershom N Carmichael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:10
CPC Classifications
H; H01; H01Q; H01Q5/00; H01Q5/40; H01Q5/48; H01Q5/49
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2281429A
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US2234744A
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US2297329A
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US2380519A
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US2413951A
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USRE23273E
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US2510010A
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US2511574A
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US2598005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-07 | 1958-09-06 | 1959-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-07 | 1962-09-06 | 1963-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-07 | 1966-09-06 | 1967-03-08 | $7700.00 | Window Closed / Lapsed |