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Patent US4378642A successfully refreshed from Google Patents.
US4378642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock-absorbing footwear heel
Assignee: National Research Development Corp UK
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Filing: 1980-10-10
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Granted: 1983-04-05
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Expires: 2000-10-10
Abstract
Abstract A shoe or other like article of footwear has a heel construction having higher shock absorbing capability in a rear portion compared to the remainder, this difference resulting from the incorporation in the rear portion of a layer of elastomeric material having a recovery which is delayed, after compression, by a time of an order not less than that during which load through the construction is transferred from the rear portion to the remainder following heel strike during normal walking. This load transfer time is about 40 ms. and the delayed recovery time will not normally exceed about 1s. A similar higher shock absorbancy can be provided additionally in a localized area of the sole.
Inventors
- 👤 Leon H. Light
- 👤 Gordon E. Maclellan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:18
CPC Classifications
A; A43; A43B; A43B21/00; A43B21/24; A43B21/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
An article of footwear, comprising: a heel construction having a higher shock absorbing capability in a rear portion compared to the remainder thereof, this difference resulting from the incorporation, at least in said rear portion, of a layer of substantially non-cellular elastomeric material having a low compression set of less than 5 percent and a recovery which is delayed, after compression, by a time of an order not less than that during which load through said construction is transferred from said rear portion to said remainder following heel strike during normal walking; said recovery time being within the range of 40 milliseconds to one second.
Claim 2
Dependent Claim
105 words
An article of footwear, comprising: a heel construction having a higher shock absorbing capability in a rear portion compared to the remainder thereof, this difference resulting from the incorporation, at least in said rear portion, of a layer of substantially non-cellular elastomeric material having a low compression set of less than 5 percent and a recovery which is delayed, after compression, by a time of an order not less than that during which load through said construction is transferred from said rear portion to said remainder following heel strike during normal walking; said recovery time being within the range of 40 milliseconds to one second.
Claim 3
Dependent Claim
20 words
An article according to claim 1 wherein said layer extends no more than half way forwardly across said heel construction.
Claim 4
Dependent Claim
23 words
An article according to claim 2 wherein said layer extends no more than a third of the way forwardly across said heel construction.
Claim 5
Dependent Claim
19 words
An article according to claim 2 wherein said layer is incorporated as an insert producing a laminated heel construction.
Claim 6
Dependent Claim
23 words
An article according to claim 4 wherein said insert is wedge-shaped and has its thicker parts adjacent the periphery of said heel construction.
Claim 7
Dependent Claim
49 words
An article according to claim 1 wherein said heel construction is constituted by an under-structure which further comprises a sole, said article incorporating a further layer of said elastomeric material in the under-structure of said article to provide greater shock absorbing capability in a localised area of the sole.
Claim 8
Dependent Claim
57 words
An article according to claim 1 wherein said heel construction is constituted by an under-structure which further comprises a sole, said article wherein said layer is extended forwardly through the under-structure of said article and is thickened in said heel rear portion and a localised area of the sole to provide greater shock absorbing capability than elsewhere.
Claim 9
Dependent Claim
57 words
An article according to claim 1 wherein said heel construction is constituted by an under-structure which further comprises a sole, said article wherein said layer is extended forwardly through the under-structure of said article and is perforated in said heel rear portion and a localised area of the sole to provide greater shock absorbing capability than elsewhere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |