Patent US6351692B1 successfully refreshed from Google Patents.
US2981339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable propeller
Assignee: Individual
•
Filing: 1960-05-12
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Granted: 1961-04-25
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Expires: 1980-05-12
Abstract
No abstract record available.
Inventors
- 👤 Allan G Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:38
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/16; B64C11/20; B64C11/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US123733A
Cited
US1436850A
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US1456008A
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US1496723A
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US1867473A
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US2498140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |