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US2667352A
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Airflight whirling device
Assignee: Individual
•
Filing: 1949-07-01
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Granted: 1954-01-26
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Expires: 1969-07-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Sepersky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:50
CPC Classifications
A; A63; A63H; A63H27/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1533912A
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US1615947A
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US1793831A
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US1880586A
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US2044819A
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US2105579A
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US2358379A
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US2380278A
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US2400175A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |