US3675346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandal
Assignee: —
•
Filing: 1971-05-24
•
Granted: 1972-07-11
•
Expires: 1991-05-24
Abstract
Abstract A sandal having a structure consisting of unfoamed surface layers, an internal closed-cell layer and intermediate open-cell layers. This improved sandal is produced by adding a foaming material comprising short lengths of fiber and a blowing agent to a thermoplastic resin, melting the resulting composition, forcing the melt into a fixed-cavity mold and cooling the melt to solidify.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:52
CPC Classifications
A; A43; A43B; A43B1/00; A43B1/14; A43B13/00; A43B13/02; A43B13/04; A43B3/00; A43B3/10; A43B3/108
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
46 words
The sandal of claim 1 wherein the sandal is integrally molded by adding a foaming material comprising short lengths of fiber and a blowing agent to a thermoplastic resin, melting the resulting composition, forcing the melt into a fixed-cavity mold and cooling the melt to solidify.
Claim 2
Dependent Claim
19 words
The sandal of claim 1 wherein a shank is inserted in the main body at the time of molding.
Claim 3
Dependent Claim
10 words
The sandal of claim 3 wherein the shank is press-board.
Claim 4
Dependent Claim
10 words
The sandal of claim 3 wherein the shank is wood.
Claim 5
Dependent Claim
10 words
The sandal of claim 3 wherein the shank is leather.
Claim 6
Dependent Claim
10 words
The sandal of claim 3 wherein the shank is steel.
References Cited (Backward Citations)
US3552039A
Cited
US3577662A
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 |