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US1384868A
Expired / Lapsed
US
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Dirigible gravity-bomb
Assignee: SAID SPERRY
•
Filing: 1918-07-26
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Granted: 1921-07-19
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Expires: 1938-07-26
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Sperry
- 👤 Jr Thomas H Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:29
CPC Classifications
F; F42; F42B; F42B10/00; F42B10/60; F42B10/62; F42B10/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-07-18 | 1925-01-17 | 1925-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-07-18 | 1929-01-17 | 1929-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-07-18 | 1933-01-17 | 1933-07-19 | $7700.00 | Window Closed / Lapsed |