Swim fin
US4689029A · kind A · utility
Inventor
Key dates
| Filing date | Mar 21, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Mar 21, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B31/11
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An improved swim fin includes a foot pocket, first and second flexible beams supported by the pocket and projecting forwardly from it, first and second struts attached securely to outer ends of the first and second flexible beams, respectively, a narrow, rigid, streamlined blade having a large span rigidly attached to outer ends of the first and second struts. The first and second flexible struts are composed of flexible plastic and have elliptical cross-sections to reduce drag and to prevent twisting. The first and second struts form legs of a U-shaped member, the bottom of which forms a cross-member maintaining spacing between the first and second flexible beams at a fixed value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.