US1789240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air screw
Assignee: METAL PROPELLERS Ltd
•
Filing: 1926-10-16
•
Granted: 1931-01-13
•
Expires: 1946-10-16
Abstract
No abstract record available.
Inventors
- 👤 Leitner Henry
- 👤 Watts Henry Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:24
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/34; B64C11/343
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) | 1934-01-12 | 1934-07-14 | 1935-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-12 | 1938-07-14 | 1939-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-12 | 1942-07-14 | 1943-01-13 | $7700.00 | Window Closed / Lapsed |