US2674420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna installation
Assignee: Lockheed Martin Corp
•
Filing: 1949-05-06
•
Granted: 1954-04-06
•
Expires: 1969-05-06
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1414418A
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US2199971A
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US2167972A
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GB504360A
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US2196819A
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FR871408A
Cited
US2358257A
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US2457393A
Cited
GB585074A
Cited
US2574853A
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US2494368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |