US4252315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Training aid for foot muscles
Assignee: Individual
•
Filing: 1979-06-04
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Granted: 1981-02-24
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Expires: 1999-06-04
Abstract
Abstract A training aid for foot muscles comprising a toe portion having a core member made of heavy metal such as lead and a resilient surface member surrounding the core member, and a heel portion having a core member made of heavy metal such as lead and a resilient surface member surrounding the core member. The toe and heel portions are so shaped that they form substantially a sole configuration, when they are placed side by side on the sole of a shoe.
Inventors
- 👤 Akira Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:23
CPC Classifications
A; A43; A43B; A43B13/00; A43B13/14; A43B13/141; A43B13/16; A43B17/00; A43B19/00; A43B19/005; A63; A63B; A63B21/00; A63B21/06; A63B21/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A training aid for foot muscles adapted to be placed on an insole of a shoe, said training aid comprising: a toe portion including a toe core member made of lead covered with a surface member made of soft and resilient material; a heel portion including a heel core member made of lead covered with a cover member made of soft and resilient material; and a flexible joint portion made of flexible material coupling said toe portion and said heel portion with each other and including a portion which is thinner than said covered heel and toe portions and which is disposed in such a manner that said heel portion can be bent along said thinner portion of said joint portion with respect to the toe portion and wherein said toe and heel portions are so shaped that they form substantially a contour configuration of the sole of the user's foot.
Claim 2
Dependent Claim
151 words
A training aid for foot muscles adapted to be placed on an insole of a shoe, said training aid comprising: a toe portion including a toe core member made of lead covered with a surface member made of soft and resilient material; a heel portion including a heel core member made of lead covered with a cover member made of soft and resilient material; and a flexible joint portion made of flexible material coupling said toe portion and said heel portion with each other and including a portion which is thinner than said covered heel and toe portions and which is disposed in such a manner that said heel portion can be bent along said thinner portion of said joint portion with respect to the toe portion and wherein said toe and heel portions are so shaped that they form substantially a contour configuration of the sole of the user's foot.
Claim 3
Dependent Claim
32 words
A training aid according to claim 1 wherein said joint portion and the cover members of said toe and heel portions are formed as an integral body of resilient high molecular material.
Claim 4
Dependent Claim
23 words
A training aid according to claim 1 wherein said core members each have a thickness of from about 5 mm to 10 mm.
References Cited (Backward Citations)
US259230A
Cited
DK12516C
Cited
US1637565A
Cited
US2545910A
Cited
US3333352A
Cited
US3517928A
Cited
US3716239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |