US3814781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making footwear having a polyurethane sole
Assignee: Toyo Tire Corp
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Filing: 1972-04-19
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Granted: 1974-06-04
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Expires: 1992-04-19
Abstract
Abstract METHOD FOR PRODUCING FOOTWEAR HAVING A POLYURTHANE SOLE OF DESIRED SPECIFIC GRAVITY WHICH COMPRISES CASTING A LIQUID,POLYURTHANE-FORMING MATERIAL INTO A SHOE SOLE MOULD MAINTAINED AT A DEFINATE INITIAL TEMPERATURE,MOUNTING A LAST WHICH BEARS A SHOE UPPER ON THE SHOE SOLE MOULD, ALLOWING THE POLYURTHANE-FORMING MATERIAL TO FOAM AND ADHERE TO THE BOTTOM OF THE UPPER, AND THEN REMOVING THE MOLD AND LAST FROM THE PRODUCT AND CURING THE FOAMED SHOE SOLE.
Inventors
- 👤 S Oka
- 👤 T Wakabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:54
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/06; B29C; B29C33/00; B29C33/56; B29C33/68; B29C44/00; B29C44/02; B29C44/12; B29C44/1271; B29C51/00; B29C51/26; B29C51/30; B29C51/34; B29D35/061; B29D35/065; B29C33/12; B29C33/14; B29C33/18; B29C51/10; B29K; B29K2621/00; B29L; B29L2031/00; B29L2031/48; B29L2031/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |