US3824716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Footwear
Assignee: PAOLO A DI
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Filing: 1973-11-08
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Granted: 1974-07-23
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Expires: 1993-11-08
Abstract
Abstract The invention disclosed is directed to skid-resistant footwear having an outer sole provided with grooves and wavy ribs spaced apart by the grooves. Also disclosed is an improved process for making the footwear, including injection molding a bottom onto a footwear upper employing a mold with a bottom plate having wavy elongate uprights.
Inventors
- 👤 Paolo A Di
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:21
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/06; B29D35/08; B29D35/081; A; A43; A43B; A43B13/00; A43B13/14; A43B13/22; A43B13/223; A43B13/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
Footwear comprising, in combination, a flexible upper and a bottom part having an outer sole connected to the upper by a bumper portion peripheral of the footwear and integral with an upper sole, the bottom of said outer sole having a number of wavy ribs spaced apart by a multiplicity of elongate grooves extending transversly of the longitudinal axis of the footwear in generally parallel wavy relationship one to the others, with thickness of the grooves being from about 0.05 to about 1 millimeter longitudinally of the footwear, the grooves being of generally Ushape in vertical section longitudinally of the footwear, said bottom part having been formed and attached to the upper by solidification of elastomeric solid-forming liquid material in a mold.
Claim 2
Dependent Claim
122 words
Footwear comprising, in combination, a flexible upper and a bottom part having an outer sole connected to the upper by a bumper portion peripheral of the footwear and integral with an upper sole, the bottom of said outer sole having a number of wavy ribs spaced apart by a multiplicity of elongate grooves extending transversly of the longitudinal axis of the footwear in generally parallel wavy relationship one to the others, with thickness of the grooves being from about 0.05 to about 1 millimeter longitudinally of the footwear, the grooves being of generally Ushape in vertical section longitudinally of the footwear, said bottom part having been formed and attached to the upper by solidification of elastomeric solid-forming liquid material in a mold.
Claim 3
Dependent Claim
48 words
The footwear of claim 1 wherein the wavy ribs have first arcuate side portions facing in a first direction and are connected by oppositely facing arcuate portions, the average radius of the first arcuate portions being relatively smaller than the average radius of the oppositely facing arcuate portions.
Claim 4
Dependent Claim
23 words
The footwear of claim 1 wherein the outer sole and the bumper having the upper sole integral therewith are all of one-piece construction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |