Patent US2227711A successfully refreshed from Google Patents.
US5285583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Puncture resistant insole for safety footwear
Assignee: Terra Nova Shoes Ltd
•
Filing: 1992-10-06
•
Granted: 1994-02-15
•
Expires: 2012-10-06
Abstract
Abstract A protective insole for use in safety footwear comprising a protective layer composed of plastic and including a flexible forepart portion having an insole board bonded to its bottom surface and a fabric liner bonded to its top surface during the process of molding the protective plastic layer. A fabric mesh may be embedded in the plastic layer for reinforcement. A further embodiment provides a steel forepart plate anchored to a plastic shank and heel about the region of greatest flexure.
Inventors
- 👤 Albertus A. W. Aleven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:42
CPC Classifications
A; A43; A43B; A43B13/00; A43B13/38; A43B7/00; A43B7/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
A protective insole for safety footwear comprising an integral protective layer composed of plastic comprising a polyamide substantially conforming in size and shape to a sole area of the footwear and including a heel portion and a relatively more flexible forepart portion, an insole board bonded by the plastic to a bottom surface of the plastic over substantially the entire area of the protective layer, and a fabric layer bonded by the plastic to a top surface of the plastic over substantially the entire area of the protective layer, wherein the plastic has an Izod Impact Strength ranging from approximately 16.8 ft-lb/in to 20.6 ft-lb/in at 73° F., and from approximately 2.1 ft-lb/in to 2.7 ft-lb/in at -40° F., for a thickness of 0.125 inches; and a flexural stress ranging from approximately 10,400 lb/in 2 to 12,800 lb/in 2 as molded and from approximately 3,250 lb/in 2 to 3,950 lb/in 2 conditioned.
Claim 2
Dependent Claim
152 words
A protective insole for safety footwear comprising an integral protective layer composed of plastic comprising a polyamide substantially conforming in size and shape to a sole area of the footwear and including a heel portion and a relatively more flexible forepart portion, an insole board bonded by the plastic to a bottom surface of the plastic over substantially the entire area of the protective layer, and a fabric layer bonded by the plastic to a top surface of the plastic over substantially the entire area of the protective layer, wherein the plastic has an Izod Impact Strength ranging from approximately 16.8 ft-lb/in to 20.6 ft-lb/in at 73° F., and from approximately 2.1 ft-lb/in to 2.7 ft-lb/in at -40° F., for a thickness of 0.125 inches; and a flexural stress ranging from approximately 10,400 lb/in 2 to 12,800 lb/in 2 as molded and from approximately 3,250 lb/in 2 to 3,950 lb/in 2 conditioned.
Claim 3
Dependent Claim
26 words
A protective insole as defined in claim 1, wherein the plastic has a flexural stress of 11,600 lb/in 2 as molded and 3,600 lb/in 2 conditioned.
References Cited (Backward Citations)
US1978549A
Cited
US2074444A
Cited
US2644250A
Cited
US2808663A
Cited
US2803895A
Cited
US3233348A
Cited
US3253600A
Cited
US3561141A
Cited
US3825017A
Cited
US4049595A
Cited
US4296053A
Cited
US4522777A
Cited
US4782605A
Cited
US5123180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |