Air-trapping insoles
US4590689A · kind A · utility
38Cited by
10References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Aug 30, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA43B17/035
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A cushion-like, shock-absorbent insole for footwear comprises two vinyl sheets forming an airtight compartment and sealing therein one or more sheets of resilient foam. Vent holes arranged in at least one of the vinyl sheets, preferably at the heel and metatarsal areas, act as metering valves in conjunction with the inside surface of the shoe sole so that air trapped in the foam material cannot instantaneously escape and both cushioning and massaging are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.