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US1247263A
Expired / Lapsed
US
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Screw-propeller.
Assignee: THEODORE FLAMMER
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Filing: 1915-08-14
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Granted: 1917-11-20
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Expires: 1935-08-14
Abstract
No abstract record available.
Inventors
- 👤 Charles W Grindle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:11
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22
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) | 1920-11-19 | 1921-05-21 | 1921-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-11-19 | 1925-05-21 | 1925-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-11-19 | 1929-05-21 | 1929-11-20 | $7700.00 | Window Closed / Lapsed |