US4017931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid filled insoles
Assignee: JONATHAN ALAN CORP
•
Filing: 1976-05-20
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Granted: 1977-04-19
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Expires: 1996-05-20
Abstract
Abstract A hollow insole provided with non-communicating compartments which are filled with liquid to form individual foot-supporting cushions. Included in the invention is a method of making the insole.
Inventors
- 👤 Preston L. Golden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:51
CPC Classifications
A; A43; A43B; A43B17/00; A43B17/02; A43B17/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A method of making a liquid-filled insole of the character described, said method comprising the following steps: a. forming a flexible, thermoplastic, dish-shaped bottom sheet in the outline of an insole, b. introducing a liquid into said dish-shaped bottom sheet, c. placing a second flexible, thermoplastic sheet in the outline of an insole upon said liquid-filled dish-shaped bottom sheet, d. applying pressure to said second sheet to displace any air between it and the liquid in the dish-shaped bottom sheet, e. heat-sealing the two sheets to each other along their peripheral edged to form a liquid-tight, liquid-filled envelope, and f. heat-sealing the two sheets to each other in an orthopedic pattern between said sealed peripheral edges, g. thereby forming a plurality of non-communicating, liquid-tight, liquid-filled compartments between the two sheets to provide a cushion effect.
Claim 2
Independent Claim
135 words
A method of making a liquid-filled insole of the character described, said method comprising the following steps: a. forming a flexible, thermoplastic, dish-shaped bottom sheet in the outline of an insole, b. introducing a liquid into said dish-shaped bottom sheet, c. placing a second flexible, thermoplastic sheet in the outline of an insole upon said liquid-filled dish-shaped bottom sheet, d. applying pressure to said second sheet to displace any air between it and the liquid in the dish-shaped bottom sheet, e. heat-sealing the two sheets to each other along their peripheral edged to form a liquid-tight, liquid-filled envelope, and f. heat-sealing the two sheets to each other in an orthopedic pattern between said sealed peripheral edges, g. thereby forming a plurality of non-communicating, liquid-tight, liquid-filled compartments between the two sheets to provide a cushion effect.
Claim 3
Dependent Claim
52 words
A method in accordance with claim 1, wherein: a. the two sheets are heat-sealed to each other in an orthopedic pattern which provides separate liquid-tight, liquid-filled compartments which cushion distinct anatomical parts of the human foot, b. separate compartments being formed to cushion the ball, heel, toes and arch of the foot.
References Cited (Backward Citations)
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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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |