US4894932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-permeable shoe
Assignee: Nippon Rubber Co Ltd
•
Filing: 1988-02-04
•
Granted: 1990-01-23
•
Expires: 2008-02-04
Abstract
Abstract An air-permeable shoe including a shoe constructed of an open-cell rubber foam. A base cloth is attached to the sole or insert therein. The sole of the shoe is exposed on a side surface of the sole of the shoe wherein a top side surface of the sole is in communication with the inside of the shoe and the ambient atmosphere. The open-cell rubber foam may be a rubber latex foam having a microstructure with a compression permanent set of less than 20%.
Inventors
- 👤 Masasuke Harada
- 👤 Yutaka Kumagawa
- 👤 Yoshiharu Moronaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:49
CPC Classifications
A; A43; A43B; A43B7/00; A43B7/06; A43B7/08; A43B7/084; A43B7/088; A43B13/00; A43B13/14; A43B13/141
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
92 words
An air-permeable shoe comprising: a sole constructed of an open-cell rubber foam; and a base cloth attached to said sole or inset therein; said sole and said base cloth of the shoe being exposed on a side surface of the sole of the shoe wherein a top side surface of said sole is in communication with the inside of the shoe and the ambient atmosphere for enabling air and humidity within said shoe to be discharged through the open-cell rubber foam and the side surface of the sole by a capillary action.
Claim 2
Dependent Claim
92 words
An air-permeable shoe comprising: a sole constructed of an open-cell rubber foam; and a base cloth attached to said sole or inset therein; said sole and said base cloth of the shoe being exposed on a side surface of the sole of the shoe wherein a top side surface of said sole is in communication with the inside of the shoe and the ambient atmosphere for enabling air and humidity within said shoe to be discharged through the open-cell rubber foam and the side surface of the sole by a capillary action.
Claim 3
Dependent Claim
17 words
An air-permeable shoe according to claim 1, wherein said open-cell rubber foam is a rubber latex foam.
Claim 4
Dependent Claim
24 words
An air-permeable shoe according to claim 1, wherein said open-cell rubber foam has a microstructure with a compression permanent set of less than 20%.
Claim 5
Dependent Claim
63 words
An air-permeable shoe according to claim 1, wherein said base cloth is a woven, knitted or nonwoven fabric selected from the group consisting of natural fibers such as cotton fibers, regenerated fibers such as rayon, Cupra or cuprammonium rayon, semi-synthetic fibers such as acetate fibers or the like, or synthetic fibers such as polyamide fibers, polyvinyl alcohol fibers, polyester fibers, and polyacrylic fibers.
Claim 6
Dependent Claim
23 words
An air-permeable shoe according to claim 1, wherein said base cloth is attached onto the top side surface of the open-cell rubber foam.
Claim 7
Dependent Claim
22 words
An air-permeable shoe according to claim 1, wherein said base cloth is attached onto the underside surface of the open-cell rubber foam.
Claim 8
Dependent Claim
28 words
An air-permeable shoe according to claim 1, wherein said base cloth is attached onto both the top side surface and the underside surface of the open-cell rubber foam.
Claim 9
Dependent Claim
18 words
An air-permeable shoe according to claim 1, wherein said base cloth is inset in the open-cell rubber foam.
Claim 10
Dependent Claim
21 words
An air-permeable shoe according to claim 1, wherein said open-cell rubber foam is inset in an intermediate sole of the shoe.
Claim 11
Dependent Claim
28 words
An air-permeable shoe according to claim 1, wherein said open-cell rubber foam is inset so as to extend from the intermediate sole to an outsole of the shoe.
Claim 12
Dependent Claim
24 words
An air-permeable shoe according to claim 1, wherein said open-cell rubber foam is inset in a tread portion of the sole of the shoe.
Claim 13
Dependent Claim
24 words
An air-permeable shoe according to claim 1, wherein said open-cell rubber foam is inset in a heel portion of the sole of the shoe.
Claim 14
Dependent Claim
41 words
An air-permeable shoe according to claim 1, wherein the top side surface of said open-cell rubber foam is in communication with the inside of the shoe through vent holes provided, respectively, in a core sole and a mid-sole of the shoe.
Claim 15
Dependent Claim
30 words
An air-permeable shoe according to claim 1, wherein said open-cell rubber foam is provided with grooves for bending which open in a side surface of the sole of the shoe.
References Cited (Backward Citations)
US2224590A
Cited
US2239211A
Cited
US2720041A
Cited
US2983056A
Cited
US2985971A
Cited
US3060599A
Cited
US4000566A
Cited
US4078321A
Cited
US4481726A
Cited
US4377041A
Cited
US4438573A
Cited
US4461099A
Cited
US4617745A
Cited
US4551930A
Cited
US4624061A
Cited
DE3524421A1
Cited
JPS62101203A
Cited
GB2183536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |