Patent US3557397A successfully refreshed from Google Patents.
US3557397A
Expired / Lapsed
US
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Swimming device
Assignee: Individual
•
Filing: 1966-12-12
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Granted: 1971-01-26
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Expires: 1986-12-12
Abstract
Abstract A SWIMMING DEVICE COMPRISING A RESILIENT FIN WHICH BECOMES RIGID WHEN MOVED IN ONE DIRECTION AGAINST THE WATER AND WHICH FIXES TO A NON-RIGID POSITION WHEN MOVED IN THE OPPOSITE DIRECTION.
Inventors
- 👤 Samuel L Margolies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:19
CPC Classifications
A; A63; A63B; A63B31/00; A63B31/08; A63B31/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |