US2499376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for variable pitch propellers
Assignee: Unisys Corp
•
Filing: 1943-07-30
•
Granted: 1950-03-07
•
Expires: 1963-07-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas M Ferrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:13
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/301
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |