← Back to Patent Explorer
US4636209A Expired / Lapsed US ⏱️ 0.0 years remaining

Sanitary napkin with fluid transfer layer

Assignee: Kimberly Clark Worldwide Inc
•
Filing: 1985-07-12
•
Granted: 1987-01-13
•
Expires: 2005-07-12
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A sanitary napkin as provided with a multilayer absorbent, the top layer of which is designed to transfer fluid rapidly from the cover to secondary layers. The top layer contains at least 60% thermoplastic fiber and is oriented 90° from the axis of deposition of the web from which it was derived.

Inventors

  • 👤 Frederich O. Lassen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 21:13
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61F13/537; A61F13/53708; A61F13/53713; A61F13/539; A61F13/15203; A61F2013/15284; A61F2013/15422; A61F2013/15447; A61F13/51; A61F2013/51002; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/53721; A61F2013/5395

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 216 words
A sanitary napkin comprising: a fluid permeable cover enclosing a multilayer fluid absorbent pad, said cover having a top side and a bottom side, said cover top side being placed adjacent a human body in use, said multilayer pad having a first layer of absorbent material adjacent said cover top side, and a second layer of absorbent material adjacent said first layer, said napkin having a longitudinal axis, said first layer formed from a planar web containing between about 60% and 80% by weight thermoplastic functional fibers to prevent capillary collapse of this layer, and at least about 20% by weight of hydrophilic absorbent material to draw fluid through said cover, wherein said planar web has a plane of deposition with fibers oriented in the X and Y direction of the plane of the web, and said first layer is comprised of a plurality of elongated portions cut from said web which are rotated 90° from said plane of deposition so at least some fibers are in the Z direction of said napkin and arranged side-by-side generally along said napkin longitudinal axis to yield said first layer, said first layer transferring fluid rapidly from said cover into said second layer with minimum fluid absorption until said second layer has exceeded about 50% of its absorbent capacity.
Claim 2
Dependent Claim 216 words
A sanitary napkin comprising: a fluid permeable cover enclosing a multilayer fluid absorbent pad, said cover having a top side and a bottom side, said cover top side being placed adjacent a human body in use, said multilayer pad having a first layer of absorbent material adjacent said cover top side, and a second layer of absorbent material adjacent said first layer, said napkin having a longitudinal axis, said first layer formed from a planar web containing between about 60% and 80% by weight thermoplastic functional fibers to prevent capillary collapse of this layer, and at least about 20% by weight of hydrophilic absorbent material to draw fluid through said cover, wherein said planar web has a plane of deposition with fibers oriented in the X and Y direction of the plane of the web, and said first layer is comprised of a plurality of elongated portions cut from said web which are rotated 90° from said plane of deposition so at least some fibers are in the Z direction of said napkin and arranged side-by-side generally along said napkin longitudinal axis to yield said first layer, said first layer transferring fluid rapidly from said cover into said second layer with minimum fluid absorption until said second layer has exceeded about 50% of its absorbent capacity.
Claim 3
Dependent Claim 25 words
The napkin according to claim 1 wherein the denier of the fibers in the web of said first absorbent layer is between 3 and 15.
Claim 4
Dependent Claim 22 words
The napkin according to claim 1 wherein the web of said first absorbent layer has a density of 0.04 to 0.08 gms/cc.

References Cited (Backward Citations)

US810135A Cited
US3143113A Cited
US3291131A Cited
US4397644A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-01-12 1990-07-14 1991-01-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-01-12 1994-07-14 1995-01-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-01-12 1998-07-14 1999-01-13 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag