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Patent US2440689A successfully refreshed from Google Patents.
US2440689A
Expired / Lapsed
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Extensible antenna support
Assignee: United States, WAR, Secretary of
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Filing: 1944-07-06
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Granted: 1948-05-04
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Expires: 1964-07-06
Abstract
No abstract record available.
Inventors
- 👤 James W Irby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:46
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/1235
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US610934A
Cited
US1070167A
Cited
US1099861A
Cited
GB124268A
Cited
US1512752A
Cited
US2225456A
Cited
US2348362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |