US5308420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
EVA insole manufacturing process
Assignee: Individual
•
Filing: 1993-02-22
•
Granted: 1994-05-03
•
Expires: 2013-02-22
Abstract
Abstract An EVA insole manufacturing process includes a step of making a molding by injecting molding an EVA resin and foaming agent mixture without through crushing or cutting procedure, and a step of heating the molding thus obtained in a mold so that it forms into a predetermined shape. Two or more moldings which respectively contain a different concentration of foaming agent or a different pigment color may be molded together so as to produce an insole which has different hardness and color at different parts thereof.
Inventors
- 👤 Kuo-Nan Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:40
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/12; B29D35/14; B29D35/142; A; A43; A43B; A43B17/00; A43B17/14; B29C; B29C44/00; B29C44/02; B29C44/04; B29C44/0461; B29C44/34; B29C44/56; B29C44/569
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
An EVA insole manufacturing process comprising: (i) forming a first molding and a second molding respectively by the steps of: (a) mixing an ethylene vinyl acetate resin with a foaming agent according to predetermined proportions, thereby forming first and second mixtures, the concentration of the foaming agent being different in each mixture; (b) injection molding the resulting mixtures into the first molding and the second molding, so that the first molding has an opening for receiving the second molding; (ii) placing the second molding within the opening of the first molding and heat foaming both the first and second moldings together in a mold to form an integral molding; and (iii) form setting the integral molding into an insole.
Claim 2
Dependent Claim
119 words
An EVA insole manufacturing process comprising: (i) forming a first molding and a second molding respectively by the steps of: (a) mixing an ethylene vinyl acetate resin with a foaming agent according to predetermined proportions, thereby forming first and second mixtures, the concentration of the foaming agent being different in each mixture; (b) injection molding the resulting mixtures into the first molding and the second molding, so that the first molding has an opening for receiving the second molding; (ii) placing the second molding within the opening of the first molding and heat foaming both the first and second moldings together in a mold to form an integral molding; and (iii) form setting the integral molding into an insole.
References Cited (Backward Citations)
US3089857A
Cited
US3412487A
Cited
US3705934A
Cited
US3766669A
Cited
US3985853A
Cited
US4021380A
Cited
JPS5725925A
Cited
US4418483A
Cited
US4674204A
Cited
US4648923A
Cited
US4594283A
Cited
US5068983A
Cited
US5141578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |