US3591882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical manufacture
Assignee: USM Corp
•
Filing: 1969-08-21
•
Granted: 1971-07-13
•
Expires: 1989-08-21
Abstract
Abstract A flexible polyvinyl chloride foam member is provided with a permanent profile or shape by use of compressive pressure and radio frequency heating.
Inventors
- 👤 Ralph E Pearsall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:54
CPC Classifications
A; A43; A43D; A43D35/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A process for producing a profiled cellular insole unit which comprises the steps of compressing a flexible, open cell, coherent insole unit blank consisting of plasticized polyvinyl chloride material to introduce a predetermined profile to the blank, and, while maintaining the blank so compressed subjecting the same to a field of radio frequency electrical energy and then setting the same whereby the profile is retained intrinsically of the blank.
Claim 2
Dependent Claim
29 words
A process according to claim 2 wherein the blank is compressed in a cross-sectional dimension while being maintained in a planar dimensional shape initially present in the insole blank.
Claim 3
Dependent Claim
30 words
A process according to claim 2 wherein the blank is compressed while superimposing an insole bottom member comprising a resin impregnated sheet having the planar shape of the insole blank.
Claim 4
Dependent Claim
46 words
A method according to claim 2 wherein the blank is compressed while interposed between an insole bottom member of resin impregnated sheet material, and a top sheet of thermoplastic synthetic polymeric material, the bottom member and top sheet having the planar shape of the insole blank.
Claim 5
Dependent Claim
34 words
A method according to claim 5 wherein the blank includes an insert member of predetermined thickness which is effectively resistant to change in state when subjected to a field of radio frequency electrical field.
Claim 6
Dependent Claim
15 words
A method according to claim 6 wherein the insert member is comprised of polyurethane foam.
Claim 7
Dependent Claim
13 words
A method according to claim 6 wherein the insert is a foam rubber.
References Cited (Backward Citations)
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Cited
US3080589A
Cited
US2940187A
Cited
US3063076A
Cited
US3186013A
Cited
US3305884A
Cited
US3418732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |