Patent US4999931A successfully refreshed from Google Patents.
US4999931A
Expired / Lapsed
US
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Shock absorbing system for footwear application
Assignee: Individual
•
Filing: 1989-02-21
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Granted: 1991-03-19
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Expires: 2009-02-21
Abstract
Abstract This invention relates to a new shock absorber which may be used as an insole or as a midsole for an article of footwear. The shock absorber comprises a multi-cell membrane which may be embedded in a flexible envelope or which may be used itself as a one-piece multi-cell membrane insole or midsole. The shock absorber exhibits improved shock absorbing characteristics which increases the comfort of the wearer of the shoes and reduces damage to the foot during athletic exercises.
Inventors
- 👤 Jean-Pierre Vermeulen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:06
CPC Classifications
A; A43; A43B; A43B13/00; A43B13/14; A43B13/18; A43B13/20; A43B13/181; A43B13/185; A43B13/206
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
An insole for use in an article of footwear, said insole comprising a synthetic rubber material consisting of a plurality of independent and non-communicating cells, each cell containing air at ambient temperature and pressure, said cells connected by an interconnector, at least one sigmoid shaped tensor membrane extending from one side of each cell through the center of each cell and sealed to another side of said cell.
Claim 2
Dependent Claim
68 words
An insole for use in an article of footwear, said insole comprising a synthetic rubber material consisting of a plurality of independent and non-communicating cells, each cell containing air at ambient temperature and pressure, said cells connected by an interconnector, at least one sigmoid shaped tensor membrane extending from one side of each cell through the center of each cell and sealed to another side of said cell.
Claim 3
Dependent Claim
14 words
An insole as claimed in claim 1 wherein said cells are spherical, in shape.
Claim 4
Dependent Claim
19 words
An insole as claimed in claim 1 wherein said tensor membrane is planar with and sealed to said interconnector.
Claim 5
Dependent Claim
20 words
An insole as claimed in claim 1 wherein said tensor membrane divides each cell into two discrete air tight subcells.
Claim 6
Dependent Claim
68 words
A midsole for use in an article of footwear, said midsole comprising a synthetic rubber material consisting of a plurality of independent and non-communicating cells, each cell containing air at ambient temperature and pressure, said cells connected by an interconnector, at least one sigmoid shaped tensor membrane extending from one side of each cell through the center of each cell and sealed to another side of said cell.
Claim 7
Dependent Claim
68 words
A midsole for use in an article of footwear, said midsole comprising a synthetic rubber material consisting of a plurality of independent and non-communicating cells, each cell containing air at ambient temperature and pressure, said cells connected by an interconnector, at least one sigmoid shaped tensor membrane extending from one side of each cell through the center of each cell and sealed to another side of said cell.
Claim 8
Dependent Claim
14 words
A midsole as claimed in claim 5 wherein said cells are spherical in shape.
Claim 9
Dependent Claim
19 words
An midsole as claimed in claim 4 wherein said tensor membrane is planar with and sealed to said interconnector.
Claim 10
Dependent Claim
20 words
An insole as claimed in claim 5 wherein said tensor membrane divides each cell into two discrete air tight subcells.
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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) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |