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Patent US2528281A successfully refreshed from Google Patents.
US2528281A
Expired / Lapsed
US
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Aircraft propeller
Assignee: Motors Liquidation Co
•
Filing: 1945-05-30
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Granted: 1950-10-31
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Expires: 1965-05-30
Abstract
No abstract record available.
Inventors
- 👤 Thomas B Martin
- 👤 Kenneth L Berninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:35
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/02; B64C11/04; B64C11/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US798078A
Cited
FR775507A
Cited
US2113438A
Cited
US2147078A
Cited
GB499518A
Cited
US2307101A
Cited
GB539303A
Cited
US2375429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |