Patent US5383870A successfully refreshed from Google Patents.
US5383870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-permeable topsheet for body fluid absorptive goods
Assignee: Mitsui Chemicals Inc
•
Filing: 1993-09-02
•
Granted: 1995-01-24
•
Expires: 2013-09-02
Abstract
Abstract A topsheet for body fluid absorptive articles improved so that liquid passages formed in the topsheet may be stabilized during use of the goods and the topsheet may offer cloth-like feeling and appearance, the topsheet being composed of an upper sheet layer made from melt blown nonwoven fabric containing downwardly extending liquid passageways and an underlying fibrous layer 11 bonded thereto adjacent the lower openings of said liquid passageways, whereby the liquid passageways will not be collapsed and the lower openings of these passageways will not be distorted.
Inventors
- 👤 Hisashi Takai
- 👤 Tsutomu Kido
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:17
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/51; A61F13/511; A61F13/512; A61F13/51121; A61F13/513; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4374; A61F13/53; A61F13/534; A61F13/537; A61F13/15203; A61F2013/15284; A61F2013/15406; A61F2013/51002; A61F2013/51004; A61F2013/51009; A61F2013/51011; A61F2013/51023; A61F2013/51038; A61F2013/51042; A61F2013/5127; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/530131; A61F2013/530343; A61F2013/530481; A61F2013/530489
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A topsheet (2) for body fluid absorptive articles comprising (a) an upper sheet layer (10) of melt blown nonwoven fabric having a weight per unit area of 10 to 100 g/m 2 and provided with a plurality of downwardly extending liquid passageways (15) having upper ends (15a) and lower ends with lower openings (15b), and (b) a lower fibrous layer (11) underlying said upper sheet layer (10) having a fineness of 1 to 10 deniers, a weight per unit area of 10 to 40 g/m 2 and a density of 0.01 to 0.1 g/cm 3 the ends with lower openings (15b) of said downwardly extending passageways (15) being bonded to said lower layer (11) so as to protect said downwardly extending liquid passageways (15) against collapse and protect said lower openings (15b) from being distorted.
Claim 2
Dependent Claim
135 words
A topsheet (2) for body fluid absorptive articles comprising (a) an upper sheet layer (10) of melt blown nonwoven fabric having a weight per unit area of 10 to 100 g/m 2 and provided with a plurality of downwardly extending liquid passageways (15) having upper ends (15a) and lower ends with lower openings (15b), and (b) a lower fibrous layer (11) underlying said upper sheet layer (10) having a fineness of 1 to 10 deniers, a weight per unit area of 10 to 40 g/m 2 and a density of 0.01 to 0.1 g/cm 3 the ends with lower openings (15b) of said downwardly extending passageways (15) being bonded to said lower layer (11) so as to protect said downwardly extending liquid passageways (15) against collapse and protect said lower openings (15b) from being distorted.
Claim 3
Dependent Claim
63 words
A topsheet (2) according to claim 1, wherein each of said liquid passageways (15) has a diameter of 0.2 to 3 mm at its upper opening (15a), a throat area ratio of 10 to 70%, a height of 0.3 to 5 mm and a diameter at its lower openings (15b) equal to 30 to 200% of the diameter of said upper opening (15a).
Claim 4
Dependent Claim
23 words
A topsheet (2) according to claim 1, wherein said nonwoven fabric forming said upper sheet layer is only composed of hydrophobic synthetic fiber.
Claim 5
Dependent Claim
20 words
A topsheet (2) according to claim 1, wherein said lower fibrous layer (11) is composed only of hydrophilic synthetic fiber.
Claim 6
Dependent Claim
37 words
A topsheet (2) according to claim 1, wherein said lower fibrous layer (11) comprises (a) a hydrophilic synthetic fiber or (b) a synthetic fiber with its surface made hydrophilic or (c) a mixture of (a) and (b).
Claim 7
Dependent Claim
22 words
A topsheet (2) according to claim 1, wherein said lower fibrous layer (11) has been treated with a suitable hydrophilicity providing agent.
References Cited (Backward Citations)
AT351156B
Cited
US3929135A
Cited
DE3517640A1
Cited
US4634440A
Cited
GB2180271A
Cited
US5188625A
Cited
US4892532A
Cited
US5135521A
Cited
US5264268A
Cited
US5264268B1
Cited
US4781962A
Cited
US4908026A
Cited
US5078710A
Cited
US4798603A
Cited
EP0409535A1
Cited
US5180620A
Cited
WO1991014414A1
Cited
US5037409A
Cited
US5145727A
Cited
EP0518340A1
Cited
WO1993009741A1
Cited
US5229191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |