Patent US2797885A successfully refreshed from Google Patents.
US2797885A
Expired / Lapsed
US
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Vortex ring parachute
Assignee: Individual
•
Filing: 1954-02-11
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Granted: 1957-07-02
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Expires: 1974-02-11
Abstract
No abstract record available.
Inventors
- 👤 Barish David Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:41
CPC Classifications
B; B64; B64D; B64D17/00; B64D17/02; B64D17/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1784774A
Cited
DE680483C
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DE660793C
Cited
US2089140A
Cited
US2440295A
Cited
FR933149A
Cited
FR978042A
Cited
US2701697A
Cited
FR1056062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |