US2231749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow metal propeller blade and method of making the same
Assignee: Wyman Gordon Co
•
Filing: 1938-01-10
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Granted: 1941-02-11
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Expires: 1958-01-10
Abstract
No abstract record available.
Inventors
- 👤 Mark H Damerell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:33
CPC Classifications
B; B21; B21K; B21K3/00; B21K3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49332; Y10T29/49334; Y10T428/00; Y10T428/12; Y10T428/12354; Y10T428/12375; Y10T428/12389; Y10T428/12403
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-02-11 | 1944-08-12 | 1945-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-11 | 1948-08-12 | 1949-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-11 | 1952-08-12 | 1953-02-11 | $7700.00 | Window Closed / Lapsed |