US2540709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making propeller blades for airplanes
Assignee: Individual
•
Filing: 1945-06-12
•
Granted: 1951-02-06
•
Expires: 1965-06-12
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49332; Y10T29/49334
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1945092A
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US1869478A
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US1854550A
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US2138370A
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US2094076A
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US2089784A
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US2306177A
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US2362745A
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US2340784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |