US5230170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Root warmer insole and method
Assignee: BARBARA DAHLE
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Filing: 1992-05-29
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Granted: 1993-07-27
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Expires: 2012-05-29
Abstract
Abstract An insole for a boot or the like has a cavity in the padding layer for holding a heat source that produces heat from an exothermic chemical reaction. The cavity is preferably located in the toe portion of the padding layer. The upper layer of the insole preferably has a plurality of holes therein for facilitating heat transfer from the heat source to the foot of a person using the insole. A pull cord may be connected to the stabilizer layer for facilitating removal of the insole from a boot or the like.
Inventors
- 👤 Robert S. Dahle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:39
CPC Classifications
A; A43; A43B; A43B7/00; A43B7/02; A43B17/00; A61; A61F; A61F7/00; A61F2007/0001; A61F2007/0039; A61F2007/0047
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
215 words
An insole for a boot or shoe, comprising: a heat source; an upper layer of a resilient material; a padding layer connected to the upper layer, the upper layer and the padding layer being formed to have a periphery that is in the general shape of the outline of the sole of a human foot and having a heel portion and a toe portion so that the insole will fit inside a boot or shoe; a compressed section in the toe portion extending across the toe section, the compressed section having a pair of ledges on opposite sides thereof that define front and rear edges of the compressed section; and a cover plate placed over the compressed section and having edges connected by stitching to the front and rear edges of the compressed section to define a cavity for holding the heat source therein, the cover plate being sufficiently rigid to stabilize the shape of the heat source and maintain it in a flattened configuration to assure comfort to the foot of a person wearing a boot or shoe in which the insole is inserted, the cover plate having a thickness such that the cover plate does not extend beyond the thickness of the insole adjacent the front and rear edges of the compressed section.
Claim 2
Dependent Claim
215 words
An insole for a boot or shoe, comprising: a heat source; an upper layer of a resilient material; a padding layer connected to the upper layer, the upper layer and the padding layer being formed to have a periphery that is in the general shape of the outline of the sole of a human foot and having a heel portion and a toe portion so that the insole will fit inside a boot or shoe; a compressed section in the toe portion extending across the toe section, the compressed section having a pair of ledges on opposite sides thereof that define front and rear edges of the compressed section; and a cover plate placed over the compressed section and having edges connected by stitching to the front and rear edges of the compressed section to define a cavity for holding the heat source therein, the cover plate being sufficiently rigid to stabilize the shape of the heat source and maintain it in a flattened configuration to assure comfort to the foot of a person wearing a boot or shoe in which the insole is inserted, the cover plate having a thickness such that the cover plate does not extend beyond the thickness of the insole adjacent the front and rear edges of the compressed section.
Claim 3
Dependent Claim
46 words
The insole of claim 1 wherein the front edge of the compressed section in the padding layer is about 0.5 inch from the toe end of the insole so that the toe end of the insole may be trimmed to adjust the length of the insole.
Claim 4
Dependent Claim
39 words
The insole of claim 2 wherein the cover plate is formed of polycarbonate having a brushed upper surface to prevent excessive sliding of the foot of a person wearing a boot or shoe in which the insole is inserted.
Claim 5
Dependent Claim
18 words
The insole of claim 3, wherein the cavity is formed in a toe portion of the insole structure.
Claim 6
Dependent Claim
36 words
The insole of claim 1, wherein the cover plate is connected by stitching to the front and rear ledges so as to maintain a substantially consistent top surface across the compressed section of the insole structure.
Claim 7
Dependent Claim
16 words
The insole of claim 1, wherein the cover plate has a plurality of holes formed therewithin.
Claim 8
Dependent Claim
13 words
The insole of claim 1, wherein the cover plate is formed of polycarbonate.
Claim 9
Dependent Claim
20 words
The insole of claim 1, wherein the cover plate has a brushed upper surface to prevent sliding of the foot.
Claim 10
Dependent Claim
16 words
The insole of claim 1, wherein the heat source is replaceably fitted within the compressed section.
References Cited (Backward Citations)
DE316531C
Cited
CH122981A
Cited
FR971950A
Cited
US2680918A
Cited
US2675630A
Cited
US3493986A
Cited
US3585736A
Cited
US4023282A
Cited
US4249319A
Cited
US4331731A
Cited
DE3342276A1
Cited
US4658515A
Cited
DE3544856A1
Cited
US4686993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-26 | 1997-01-25 | 1997-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-26 | 2001-01-25 | 2001-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-26 | 2005-01-25 | 2005-07-27 | $7700.00 | Window Closed / Lapsed |