Patent US2563020A successfully refreshed from Google Patents.
US2563020A
Expired / Lapsed
US
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Propeller assembly for model airplanes
Assignee: Individual
•
Filing: 1949-05-20
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Granted: 1951-08-07
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Expires: 1969-05-20
Abstract
No abstract record available.
Inventors
- 👤 Walter F Gemeinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:19
CPC Classifications
A; A63; A63H; A63H27/00; A63H27/02; F; F02; F02B; F02B75/00; F02B75/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR419505A
Cited
US1608755A
Cited
US1801725A
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US1634330A
Cited
US1661633A
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US1773319A
Cited
US1730742A
Cited
US1926428A
Cited
US2234073A
Cited
US2278900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |