Patent US3239857A successfully refreshed from Google Patents.
US3239857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swim fin
Assignee: Individual
•
Filing: 1964-04-06
•
Granted: 1966-03-15
•
Expires: 1984-04-06
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Gwynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:16
CPC Classifications
A; A63; A63B; A63B31/00; A63B31/08; A63B31/10; A63B31/11
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
IN A SWIM FIN HAVING A SHOE-LIKE MEMBER AND A FIN BLADE, A LEG CASING ATTACHED TO THE SHOE, AND MEANS COMPRISING A CURVED REINFORCING MEMBER AT EITHER SIDE OF THE SHOE EXTENDING REARWARDLY AND UPWARDLY FROM THE SHOE AND ALONGSIDE SAID LEG CASING, SAID REINFORCING MEMBER FORMED INTEGRALLY WITH SAID SHOE AND SAID LEG CASING AND BEING ADAPTED TO INCREASINGLY RESIST BENDING UPON FLEXURE OF THE SHOE WITH RESPECT TO THE LEG CASING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |