US4513518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shoe inner sole
Assignee: Rogers Foam Corp
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Filing: 1982-09-30
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Granted: 1985-04-30
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Expires: 2002-09-30
Abstract
Abstract An inner sole with a cushioning layer of polyurethane foam, with compression set less than 10%, laminated to a thinner layer of thermoformable polyethylene foam, which serves primarily as a vehicle for shaping the polyurethane.
Inventors
- 👤 Robert A. Jalbert
- 👤 Anthony P. Galcenski, Jr.
- 👤 Charles C. Urmson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
A; A43; A43B; A43B7/00; A43B7/14; A43B7/1405; A43B7/1415; A43B7/142; A43B17/00; A43B17/02; A43B7/144
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
An innersole for athletic shoes and the like comprising a foot-cushioning layer of polyurethane foam, said polyurethane foam having a compression set of less than 10%, a layer of polyethylene foam bonded to said polyurethane layer, said polyethylene layer being thinner than said polyurethane layer, said polyethylene layer having been thermoformed and thereby given a nonuniform thickness, said polyurethane foam having a breakdown temperature below the temperature required for thermoforming said polyethylene layer, said polyurethane foam having a thickness unaltered by thermoforming, and said polyurethane foam being shaped by said thermoformed polyethylene layer.
Claim 2
Dependent Claim
93 words
An innersole for athletic shoes and the like comprising a foot-cushioning layer of polyurethane foam, said polyurethane foam having a compression set of less than 10%, a layer of polyethylene foam bonded to said polyurethane layer, said polyethylene layer being thinner than said polyurethane layer, said polyethylene layer having been thermoformed and thereby given a nonuniform thickness, said polyurethane foam having a breakdown temperature below the temperature required for thermoforming said polyethylene layer, said polyurethane foam having a thickness unaltered by thermoforming, and said polyurethane foam being shaped by said thermoformed polyethylene layer.
Claim 3
Dependent Claim
42 words
The innersole of claim 1 wherein said polyurethane layer is the upper layer and further comprising a heel piece of microcell polyurethane foam bonded below said polyethylene layer so as to form a three layer structure in the vicinity of the heel.
Claim 4
Dependent Claim
17 words
The innersole of claim 2 wherein said polyethylene foam is thicker in the vicinity of the arch.
Claim 5
Dependent Claim
25 words
The innersole of claim 1 wherein said microcell polyurethane foam is the upper layer and includes a pattern of vertical holes to enhance foot breathing.
Claim 6
Dependent Claim
12 words
The innersole of claim 4 wherein said polyurethane foam is open cell.
Claim 7
Dependent Claim
12 words
The innersole of claim 1 wherein said polyethylene foam is closed cell.
Claim 8
Dependent Claim
10 words
The innersole of claim 1 wherein said polyethylene is cross-linked.
Claim 9
Dependent Claim
19 words
The innersole of claim 1 wherein said polyurethane foam has a density greater than that of said polyethylene foam.
Claim 10
Dependent Claim
21 words
The innersole of claim 8 wherein said polyurethane foam has a density in the range 2 to 20 lb/ft 3 .
Claim 11
Dependent Claim
21 words
The innersole of claim 9 wherein said polyethylene foam has a density in the range 2 to 12 lb/ft 3 .
Claim 12
Dependent Claim
20 words
The innersole of claim 10 wherein the thickness of said polyurethane layer is in the range 0.05 to 0.17 inches.
Claim 13
Dependent Claim
35 words
The innersole of claim 1 wherein the compressive load characteristic of the polyurethane foam is in the range of 5 to 25 psi when compressed 25% of original thickness at a rate of 1 inch/min.
References Cited (Backward Citations)
GB936975A
Cited
FR1413280A
Cited
US3828792A
Cited
US3724105A
Cited
US3730169A
Cited
US4232457A
Cited
US4237627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |