Patent US5376463A successfully refreshed from Google Patents.
US2582559A
Expired / Lapsed
US
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Variable pitch propeller
Assignee: Individual
•
Filing: 1947-04-14
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Granted: 1952-01-15
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Expires: 1967-04-14
Abstract
No abstract record available.
Inventors
- 👤 Elmer O Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/02; B63H3/04; B63H2003/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US861612A
Cited
US919071A
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US961285A
Cited
GB190911625A
Cited
GB191200011A
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US1069026A
Cited
GB228707A
Cited
US2269833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |