US4897939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Footwear reinforcement
Assignee: Dunlop Ltd
•
Filing: 1988-10-06
•
Granted: 1990-02-06
•
Expires: 2008-10-06
Abstract
Abstract An article of footwear comprises an upper, a flexible metal midsole and an outsole. Between the flexible metal midsole and the outsole is located an internal arch-reinforcement member or "digging-plate". The "digging-plate" may be made of a rigid plastics material, suitably a fibre-reinforced plastics material.
Inventors
- 👤 Robert Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:52
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/06; B29D35/061; A; A43; A43B; A43B7/00; A43B7/32; B29D35/08; B29D35/081
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
In a footwear article suitable for heavy duty outdoor use consisting of an upper attached to an outsole member and a flexible metal midsole member secured between said upper and said outsole member, the improvement which comprises securing an additional arch-reinforcement member within the sole between said flexible metal midsole member and said outsole member so as to strengthen the sole in the area contacted by a shovel when the wearer is using a shovel for digging.
Claim 2
Dependent Claim
77 words
In a footwear article suitable for heavy duty outdoor use consisting of an upper attached to an outsole member and a flexible metal midsole member secured between said upper and said outsole member, the improvement which comprises securing an additional arch-reinforcement member within the sole between said flexible metal midsole member and said outsole member so as to strengthen the sole in the area contacted by a shovel when the wearer is using a shovel for digging.
Claim 3
Dependent Claim
16 words
The article of claim 1, wherein said arch-reinforcement member is made of a rigid plastics material.
Claim 4
Dependent Claim
17 words
The article of claim 2, wherein said arch-reinforcement member is made of a rigid, fibre-reinforced plastics material.
Claim 5
Dependent Claim
22 words
The article of claim 2, wherein said rigid plastics material is a material selected from the group consisting of polycarbonates and polypropylenes.
Claim 6
Dependent Claim
11 words
The article of claim 3, wherein said fibres are glass fibres.
Claim 7
Dependent Claim
18 words
The article of claim 1, wherein said outsole member is shaped so as to accommodate said arch-reinforcement member.
Claim 8
Dependent Claim
21 words
The article of claim 1, wherein said arch-reinforcement member is secured to said flexible metal member by means of an adhesive.
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |