US1830731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air screw hub
Assignee: Sir WG Armstrong Whitworth and Co Engineers Ltd
•
Filing: 1930-01-24
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Granted: 1931-11-03
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Expires: 1950-01-24
Abstract
No abstract record available.
Inventors
- 👤 Wylie Hamilton Neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:15
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/02; B64C11/04; B64C11/06; B64C11/065
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) | 1934-11-02 | 1935-05-04 | 1935-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-11-02 | 1939-05-04 | 1939-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-11-02 | 1943-05-04 | 1943-11-03 | $7700.00 | Window Closed / Lapsed |