Patent CA803116A successfully refreshed from Google Patents.
US5308673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stitchbonded absorbent articles and method of making same
Assignee: 3M Co
•
Filing: 1992-05-07
•
Granted: 1994-05-03
•
Expires: 2012-05-07
Abstract
Abstract A stitchbonded absorbent article and method of making same are presented. The article exhibits good hand, repeated washing durability, and absorbency. The article includes (a) at least a first layer of material comprising a first nonwoven batt consisting essentially of cellulosic pulp fibers bonded together by an adhesive binder, the first layer having a basis weight of at least about 95 gsm per ply; and preferably (b) a second layer comprising materials selected from the group consisting of i) a second nonwoven batt consisting essentially of cellulosic pulp fibers bonded together by an adhesive binder, wherein the second nonwoven batt consisting essentially of nonwoven cellulosic pulp fiber being the same or different than the first batt, and ii) a woven, nonwoven, or knitted layer of materials selected from the group consisting of viscose rayon, cotton, non-polyolefin synthetic fibers, and mixtures thereof, wherein the first and second layers are mechanically held together by stitches of yarn, at a stitch density ranging from about 15 to about 35 st/10 cm, and stitch gauge ranging from about 10 to about 40, using a stitching yarn comprising at least two compositionally different fibers having different heat stability being at least partially melt-bonded together at points of mutual contact, the yarn being melt-bonded at least partially to outer surfaces of the article.
Inventors
- 👤 Miroslav Tochacek
- 👤 Donald M. Courteau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:14
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3203; D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/45; A61F; A61F9/00; A61F9/007; A61F9/00736; D04B; D04B21/00; D04B21/14; D04B21/16; D04B21/165; D04H1/42; D04H1/425; D04H1/4374; D04H1/52; D04H1/54; D04H1/58; D04H1/64; D10; D10B; D10B2401/00; D10B2401/04; D10B2401/041; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24033; Y10T428/25; Y10T428/253; Y10T442/00; Y10T442/30; Y10T442/3707; Y10T442/3724; Y10T442/40; Y10T442/494; Y10T442/60; Y10T442/659; Y10T442/666; Y10T442/667
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
105 words
A stitchbonded absorbent article comprising a nonwoven batt consisting essentially of cellulosic pulp fibers bonded together by an adhesive binder, the batt having a basis weight of at least about 95 gsm per ply, the article stitchbonded by stitches of yarn, at a stitch density ranging from about 15 to about 35 st/10 cm, and stitch gauge ranging from about 10 to about 40, using a stitching yarn comprising at least two compositionally different fibers having different heat stability being at least partially melt-bonded together at points of mutual contact, at least a portion of the yarn being melt-bonded to external surfaces of the article.
Claim 2
Dependent Claim
105 words
A stitchbonded absorbent article comprising a nonwoven batt consisting essentially of cellulosic pulp fibers bonded together by an adhesive binder, the batt having a basis weight of at least about 95 gsm per ply, the article stitchbonded by stitches of yarn, at a stitch density ranging from about 15 to about 35 st/10 cm, and stitch gauge ranging from about 10 to about 40, using a stitching yarn comprising at least two compositionally different fibers having different heat stability being at least partially melt-bonded together at points of mutual contact, at least a portion of the yarn being melt-bonded to external surfaces of the article.
Claim 3
Dependent Claim
107 words
The absorbent article of claim 1 wherein the nonwoven batt is a first layer, the article further comprising a second layer comprising materials selected from the group consisting of i) a second nonwoven batt consisting essentially of cellulosic pulp fibers bonded together by an adhesive binder, wherein the second nonwoven batt consisting essentially of nonwoven cellulosic pulp fiber being the same or different than the first batt, and ii) a woven, nonwoven, or knitted layer of materials selected from the group consisting of viscose rayon, cotton, non-polyolefin synthetic fibers, and mixtures thereof, wherein the first and second layers are mechanically held together by said stitches of yarn.
Claim 4
Dependent Claim
48 words
The absorbent article of claim 2 wherein the second layer comprises a second nonwoven batt consisting essentially of cellulosic pulp fibers bonded together by an adhesive binder, wherein the second nonwoven batt consisting essentially of nonwoven cellulosic pulp fiber being the same or different than the first batt.
Claim 5
Dependent Claim
34 words
The absorbent article of claim 2 wherein the second layer comprises a woven, nonwoven, or knitted layer of materials selected from the group consisting of viscose rayon, cotton, non-polyolefin synthetic fiber, and mixtures thereof.
Claim 6
Dependent Claim
19 words
The absorbent article of claim 1 wherein the stitch density ranges from about 20 to about 30 st/10 cm.
Claim 7
Dependent Claim
19 words
The absorbent article of claim 2 wherein the stitch density ranges from about 20 to about 30 st/10 cm.
Claim 8
Dependent Claim
45 words
The absorbent article of claim 1 wherein the yarn comprises a first fiber having a melting temperature below that of the cellulosic pulp fiber but no greater than about 175° C., and a second fiber having a melting temperature of at least about 200° C.
Claim 9
Dependent Claim
45 words
The absorbent article of claim 2 wherein the yarn comprises a first fiber having a melting temperature below that of the cellulosic pulp fiber but no greater than about 175° C., and a second fiber having a melting temperature of at least about 200° C.
Claim 10
Dependent Claim
28 words
The absorbent article of claim 2 wherein the adhesive binder of the first and second batts of cellulosic pulp fiber comprises a copolymer of ethylene and vinyl acetate.
Claim 11
Dependent Claim
40 words
The absorbent article of claim 4 which further comprises a third layer, wherein the third layer comprises a woven, nonwoven, or knitted layer of materials selected from the group consisting of viscose rayon, cotton, non-polyolefin synthetic fibers, and mixtures thereof.
Claim 12
Dependent Claim
31 words
The absorbent article of claim 1 wherein the first fiber consists essentially of polyolefin polymers selected from the group consisting of branched polyethylene, linear polyethylene, polypropylene, mixtures thereof, and copolymers thereof.
Claim 13
Dependent Claim
32 words
The absorbent article of claim 1 wherein the second fiber consists essentially of polymers selected from the group consisting of polyester, cotton, protein, rayon, cellulose acetate, fluorocarbon, polyacrylonitrile, polyamide, and mixtures thereof.
Claim 14
Dependent Claim
23 words
The absorbent article of claim 1 wherein the first fiber consists essentially of polypropylene and the second fiber consists essentially of polyethylene terephthalate.
Claim 15
Dependent Claim
31 words
The absorbent article of claim 6 wherein the first fiber consists essentially of polyolefin polymers selected from the group consisting of branched polyethylene, linear polyethylene, polypropylene, mixtures thereof, and copolymers thereof.
Claim 16
Dependent Claim
32 words
The absorbent article of claim 6 wherein the second fiber consists essentially of polymers selected from the group consisting of polyester, cotton, protein, rayon, cellulose acetate, fluorocarbon, polyacrylonitrile, polyamide, and mixtures thereof.
Claim 17
Dependent Claim
23 words
The absorbent article of claim 6 wherein the first fiber consists essentially of polypropylene and the second fiber consists essentially of polyethylene terephthalate.
References Cited (Backward Citations)
US3030786A
Cited
DE2227318A1
Cited
US3279221A
Cited
US3717150A
Cited
US3837943A
Cited
US3881490A
Cited
US4100324A
Cited
US4675226A
Cited
US4704321A
Cited
US4773238A
Cited
GB2209352A
Cited
US4876128A
Cited
US5041255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |