Patent US2378049A successfully refreshed from Google Patents.
US2378049A
Expired / Lapsed
US
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Fluid propeller
Assignee: Madison Management Group Inc
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Filing: 1941-11-29
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Granted: 1945-06-12
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Expires: 1961-11-29
Abstract
No abstract record available.
Inventors
- 👤 Walter L Upson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:48
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/384; F04D29/325; F04D29/329; F05; F05D; F05D2240/00; F05D2240/20; F05D2240/30; F05D2240/303
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) | 1948-06-11 | 1948-12-11 | 1949-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-06-11 | 1952-12-11 | 1953-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-06-11 | 1956-12-11 | 1957-06-12 | $7700.00 | Window Closed / Lapsed |