US2427785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hollow steel propeller blades
Assignee: Individual
•
Filing: 1943-04-30
•
Granted: 1947-09-23
•
Expires: 1963-04-30
Abstract
No abstract record available.
Inventors
- 👤 Walter S Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:41
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/78; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49332
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1943560A
Cited
US1781160A
Cited
US1996850A
Cited
US2007775A
Cited
US1988202A
Cited
CH162526A
Cited
US2025555A
Cited
US2231749A
Cited
US2231772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |