US2558487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifrequency tunable antenna
Assignee: JOSEPH N MARKS
•
Filing: 1949-06-28
•
Granted: 1951-06-26
•
Expires: 1969-06-28
Abstract
No abstract record available.
Inventors
- 👤 Hills Elmer Guy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:18
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/14; H01Q9/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2129514A
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US2229078A
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US2258406A
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US2311364A
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US2438116A
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US2259628A
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US2313046A
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US2351723A
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US2469168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |