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Patent US5308420A successfully refreshed from Google Patents.
US5308420A
Expired / Lapsed
US
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EVA insole manufacturing process
Assignee: Individual
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Filing: 1993-02-22
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Granted: 1994-05-03
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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 12:57
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.
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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) | 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 |