Patent US1788870A successfully refreshed from Google Patents.
US2637404A
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Rubber-backed propeller
Assignee: Individual
•
Filing: 1951-09-05
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Granted: 1953-05-05
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Expires: 1971-09-05
Abstract
No abstract record available.
Inventors
- 👤 Siegfried G Bart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:44
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/16; B64C11/20; B64C11/205; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12562; Y10T428/31504; Y10T428/31678; Y10T428/31707; Y10T428/3171
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |