US2521550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio antenna system
Assignee: AT&T Inc
•
Filing: 1946-02-28
•
Granted: 1950-09-05
•
Expires: 1966-02-28
Abstract
No abstract record available.
Inventors
- 👤 Phillip H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:04
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/26; H01Q21/06; H01Q21/20; H01Q21/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1483860A
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DE388072C
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GB338982A
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US2190816A
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US2175254A
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US2267550A
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US2298449A
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US2324462A
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US2400937A
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US2338564A
Cited
US2405123A
Cited
US2391026A
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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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |