Patent FR545136A successfully refreshed from Google Patents.
US2425353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible, variable-diameter propeller
Assignee: Individual
•
Filing: 1942-09-05
•
Granted: 1947-08-12
•
Expires: 1962-09-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Lyman Spitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:21
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/003
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1145388A
Cited
US1463556A
Cited
US1491972A
Cited
US1684567A
Cited
US1831366A
Cited
US1781883A
Cited
US2041849A
Cited
US1957887A
Cited
US2226978A
Cited
US2163482A
Cited
US2172334A
Cited
US2145413A
Cited
GB527443A
Cited
US2344266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |