US2643725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically welded hollow steel propeller blade and method of making same
Assignee: AO Smith Corp
•
Filing: 1950-01-12
•
Granted: 1953-06-30
•
Expires: 1970-01-12
Abstract
No abstract record available.
Inventors
- 👤 William C Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:13
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/78; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49332; Y10T29/49334
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB220673A
Cited
GB452611A
Cited
US2214338A
Cited
US2235032A
Cited
DE700360C
Cited
US2231772A
Cited
US2257335A
Cited
GB541759A
Cited
US2354198A
Cited
US2458975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |