US2457889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide propeller blade manufacture
Assignee: AO Smith Corp
•
Filing: 1943-10-23
•
Granted: 1949-01-04
•
Expires: 1963-10-23
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Gruetjen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:45
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/04; 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)
US1488894A
Cited
CH100283A
Cited
FR603100A
Cited
US1674674A
Cited
US1818492A
Cited
US1835913A
Cited
US1939357A
Cited
GB350859A
Cited
US1996850A
Cited
US2031863A
Cited
US2019329A
Cited
US1998393A
Cited
GB440655A
Cited
US2183158A
Cited
US2214338A
Cited
US2124548A
Cited
US2148555A
Cited
GB541759A
Cited
US2306177A
Cited
US2383342A
Cited
US2370136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |