Patent US3676542A successfully refreshed from Google Patents.
US3676542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of footwear
Assignee: Bata Shoe Co Inc
•
Filing: 1969-10-02
•
Granted: 1972-07-11
•
Expires: 1989-10-02
Abstract
Abstract When hot injection molding thermoplastic soles onto textile components the sole portion of the last is heated to achieve better bonding. In order to markedly increase production, only the peripheral part of the sole portion of the last is heated, the middle (remaining) part is maintained at an effectively lower temperature. This is accomplished by providing a last having either an insulating layer between the middle and peripheral parts thereof, or, marking the middle part entirely of insulating material.
Inventors
- 👤 Frank Vincent Maltby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:29
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/06; A; A43; A43B; A43B13/00; A43B13/28; B29D35/061; B29D35/064; B29K; B29K2021/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
45 words
Method of producing shoes as claimed in claim 1 wherein said last is solid metal and said remaining part is also solid metal with an insulating layer of a material selected from the group consisting essentially of epoxy, polyurethane, polyester, or mixtures of such resins.
Claim 2
Dependent Claim
37 words
Method of producing shoes as claimed in claim 1 wherein said last is solid metal and said remaining part is insulating material selected from the group consisting essentially of epoxy, polyurethane, polyester, or mixtures of such resins.
Claim 3
Dependent Claim
17 words
Method of producing shoes as claimed in claim 3 wherein said insulating material has particulate silicon filler.
References Cited (Backward Citations)
US2830924A
Cited
US3441643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |