Insole with concentric circular heel structure
US4534121A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1984 |
| Grant date | Aug 13, 1985 |
| Priority date | — |
| Expiry date | Jan 16, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA43B17/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A shoe insole includes a heel portion (12), a mid portion (14) and a toe portion (16). On the under surface of the shoe insole, a cylindrical disc (18) is formed in the center of the heel portion (12). Annular rings (20) and (22) are also formed in the heel portion (12) and concentrically disposed about the cylindrical disc (18). A plurality of arcuate ridges (24) are disposed on the mid portion (14) and constituting arcs of concentric circles radiating outward from said cylindrical disc (18). The cylindrical disc (18), the annular ridges (20) and (22) and the arcuate ridges (24) have essentially the same height and are formed of a highly resilient material such as polyurethane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.