Patent US4210926A successfully refreshed from Google Patents.
US4306559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture-permeable disposable diapers
Assignee: Kao Corp
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Filing: 1980-02-27
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Granted: 1981-12-22
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Expires: 2000-02-27
Abstract
Abstract A disposable diaper comprising a urine-permeable surface sheet, a urine-impervious backing sheet and an absorbent pad interposed between said two sheets, said disposable diaper being characterized in that the urine-impervious backing sheet comprises at least two layers, the first layer being a substantially urine-impermeable, vapor-permeable sheet, and the second layer being a urine-impermeable sheet which is perforated at an aperture ratio lower than 30%, said first and second layer being integrally formed.
Inventors
- 👤 Kazunori Nishizawa
- 👤 Toshihiro Shirase
- 👤 Hiroshi Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:25
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/51; A61F13/514; A61F13/51474; A61F13/51478; A61F13/5148; A61F13/51456; A61F13/51458; A61F13/5146
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A disposable diaper comprising a urine-permeable surface sheet, a urine-impervious vapor-permeable backing sheet and an absorbent pad interposed between said two sheets, said diaper being characterized in that the urine-impervious vapor-permeable backing sheet comprises at least two layers, the first layer being a substantially urine-impervious vapor-permeable non-woven fabric sheet having pores of a diameter smaller than 50μ, said non-woven fabric sheet being composed of hydrophobic thermoplastic fibers, the second layer being a sheet which is rendered vapor-permeable by perforations with an aperture ratio of from 2 to 30%, said first and second layer being integrally formed whereby the vapor permeation of the backing sheet is controlled.
Claim 2
Dependent Claim
106 words
A disposable diaper comprising a urine-permeable surface sheet, a urine-impervious vapor-permeable backing sheet and an absorbent pad interposed between said two sheets, said diaper being characterized in that the urine-impervious vapor-permeable backing sheet comprises at least two layers, the first layer being a substantially urine-impervious vapor-permeable non-woven fabric sheet having pores of a diameter smaller than 50μ, said non-woven fabric sheet being composed of hydrophobic thermoplastic fibers, the second layer being a sheet which is rendered vapor-permeable by perforations with an aperture ratio of from 2 to 30%, said first and second layer being integrally formed whereby the vapor permeation of the backing sheet is controlled.
Claim 3
Dependent Claim
20 words
The disposable diaper as set forth in claim 1, wherein said thermoplastic fibers have an average diameter smaller than 5μ.
Claim 4
Dependent Claim
26 words
The disposable diaper as set forth in claim 1, wherein said thermoplastic fibers are treated so that the contact angle to water is at least 90°.
Claim 5
Dependent Claim
15 words
The disposable diaper as set forth in claim 1, wherein said thermoplastic fibers are polypropylene.
Claim 6
Dependent Claim
17 words
The disposable diaper as set forth in claim 1, wherein said second layer is composed of polyethylene.
Claim 7
Dependent Claim
40 words
The disposable diaper as set forth in claim 1, wherein the area of each pore of the perforated sheet is an area corresponding to a diameter of 0.5 to about 20 mm presupposing that the pore has a circular shape.
Claim 8
Dependent Claim
24 words
The disposable diaper as set forth in claim 1, wherein said second layer is perforated with an aperture ratio of from 2 to 15%.
References Cited (Backward Citations)
US3073308A
Cited
US3779246A
Cited
US3989867A
Cited
US3881489A
Cited
US3996936A
Cited
US3886941A
Cited
US4041951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |