US2465457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for fluid-propelled airships
Assignee: Individual
•
Filing: 1944-07-31
•
Granted: 1949-03-29
•
Expires: 1964-07-31
Abstract
No abstract record available.
Inventors
- 👤 Johnston Greenhow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:42
CPC Classifications
B; B64; B64B; B64B1/00; B64B1/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR403730A
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US982561A
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US1209301A
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US1290669A
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US1457024A
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US1471764A
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US1572812A
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US1585281A
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US1938234A
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GB342260A
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US1895518A
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US2384385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-28 | 1952-09-27 | 1953-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-28 | 1956-09-27 | 1957-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-28 | 1960-09-27 | 1961-03-29 | $7700.00 | Window Closed / Lapsed |