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US4886697A
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US
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Thermoplastic material containing absorbent pad or other article
Assignee: Weyerhaeuser Co
•
Filing: 1988-04-29
•
Granted: 1989-12-12
•
Expires: 2008-04-29
Abstract
Abstract Materials have at least one layer comprising a mixture of thermoplastic and other fibers. This latter layer may be thermobonded together and then densified along at least a section of the eventual peripheral edge margin of an article to be formed from the material. Thermoplastic material-containing cover sheets may also be secured to the core and densified in this manner. The entire eventual peripheral edge margin of the article is typically densified. The material is cut within the densified region or slightly outside the densified region to provide a soft peripheral edge. Absorbent materials may be thermobonded within the layer and surrounded by a densified edge to fix them within the article. The composite materials are used in manufacturing infant car seat liners and other articles. In addition, sections of the material may be densified and provided with weakened areas, such as perforations, to enable users to selectively separate the articles along the perforations.
Inventors
- 👤 Lee E. Perdelwitz, Jr
- 👤 Robert H. Young
- 👤 Ron H. Iff
- 👤 David E. Hanke
- 👤 Kathleen S. Allison
- 👤 Raimo K. Rahkonen
- 👤 Amar N. Neogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:45
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; A; A47; A47C; A47C27/00; A47C27/002; A47C27/005; A47C27/008; A47D; A47D15/00; A61; A61F; A61F13/00; A61F13/15; A61F13/15577; A61F13/15617; A61F13/1565; A61F13/53; A61F13/539; A61F5/00; A61F5/48; A61F5/485; B32B27/00; B32B27/12; B32B7/14; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/541; D04H1/5412; D04H1/5418; A61F2013/15008; A61F2013/15048; A61F2013/15056; A61F2013/530131; A61F2013/530226; A61F2013/53024; A61F2013/530343; A61F2013/53035; A61F2013/530481; A61F13/84; A61F13/8405; A61F2013/8408; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0276; B32B2262/06; B32B2262/062; B32B2262/067; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2555/00; Y; Y10; Y10S; Y10S297/00; Y10S297/05; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/25; Y10T428/253; Y10T428/27
Claims Analysis
Total Claims: 92
Claim 1
Independent Claim
59 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article, the densified peripheral edge margin of fiberous material forming a substantial liquid barrier along the at least a section of the article.
Claim 2
Dependent Claim
59 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article, the densified peripheral edge margin of fiberous material forming a substantial liquid barrier along the at least a section of the article.
Claim 3
Dependent Claim
19 words
An article according to claim 1 in which the densified edge margin extends to the edge of the article.
Claim 4
Dependent Claim
35 words
An article according to claim 1 in which the densified edge margin is bounded at least in part by an edge of the article which is of a lower density than the densified edge margin.
Claim 5
Dependent Claim
36 words
An article according to claim 3 in which the thermobonded mixture comprises a core, the article including at least one cover sheet mounted to the core and densified along at least a section of the article.
Claim 6
Dependent Claim
37 words
An article according to claim 2 in which the thermobonded mixture comprises a core, the article including at least one cover sheet mounted to the core and densified along the at least a section of the article.
Claim 7
Dependent Claim
19 words
An article according to claim 1 also having a pattern of densified areas in the field of the article.
Claim 8
Dependent Claim
45 words
An article according to claim 6 in which the thermobonded mixture comprises a core, the article having a backing sheet of a liquid impermeable material mounted to the core and a face sheet of a liquid permeable material, the face sheet being mounted to core.
Claim 9
Dependent Claim
21 words
An article according to claim 7 in which the backing sheet is secured at every point of contact to the core.
Claim 10
Dependent Claim
17 words
An article according to claim B in which the backing sheet is adhesively secured to the core.
Claim 11
Dependent Claim
22 words
An article according to claim 8 in which the face sheet contains a thermoplastic material and is heat bonded to the core.
Claim 12
Dependent Claim
52 words
An article according to claim 10 in which the backing sheet is of a thermoplastic containing material and in which the face sheet, core and backing sheet are each densified and bonded together about the periphery of the article and at a pattern of bond areas within the field of the article.
Claim 13
Dependent Claim
58 words
An article according to claim 9 in which the face sheet contains a thermoplastic material and the backing sheet contains a thermoplastic material and in which the face sheet, core and backing sheet are each densified and bonded together about the periphery of the article and at a pattern of bond areas within the field of the article.
Claim 14
Dependent Claim
18 words
An article according to claim 1 which is also bonded together at a spaced pattern of bond areas.
Claim 15
Dependent Claim
31 words
An article according to claim 7 formed in the shape of an infant seat liner having a lower leg supporting portion, a central seat supporting portion and upper body supporting portion.
Claim 16
Dependent Claim
32 words
An article according to claim 8 formed in the shape of an infant seat liner having a lower leg supporting portion, a central seat supporting portion and an upper body supporting portion.
Claim 17
Dependent Claim
38 words
An article according to claim 1 in which the thermobonded mixture comprises the core, the article having a backing sheet mounted to one side of the core and a face sheet mounted to another side of the core.
Claim 18
Dependent Claim
103 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; the thermobonded mixture comprising a core, the article having a backing sheet mounted to one side of the core and a face sheet mounted to another side of the core; and the article having a Z direction tensile strength at the densified edge margin of fiberous material of greater than 25 KN/m 2 , but not greater than the breaking point of the materials, when dry.
Claim 19
Dependent Claim
103 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; the thermobonded mixture comprising a core, the article having a backing sheet mounted to one side of the core and a face sheet mounted to another side of the core; and the article having a Z direction tensile strength at the densified edge margin of fiberous material of greater than 25 KN/m 2 , but not greater than the breaking point of the materials, when dry.
Claim 20
Dependent Claim
39 words
An article according to claim 17 having a Z direction tensile strength at the densified edge margin of the article of greater than 50 KN/m 2 , but not greater than the breaking point of the materials, when dry.
Claim 21
Dependent Claim
18 words
An article according to claim 16 having a basis weight of from 80 to 450 g/m 2 .
Claim 22
Dependent Claim
91 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; the thermobonded mixture comprising a core, the article having a backing sheet mounted to one side of the core and a face sheet mounted to another side of the core; and in which the density of the article at the densified edge margin of fiberous material is from 0.3 to 1.0 g/cm 3 .
Claim 23
Dependent Claim
91 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; the thermobonded mixture comprising a core, the article having a backing sheet mounted to one side of the core and a face sheet mounted to another side of the core; and in which the density of the article at the densified edge margin of fiberous material is from 0.3 to 1.0 g/cm 3 .
Claim 24
Dependent Claim
16 words
An article according to claim 1 having a taber stiffness of from 10 to 100 g-cm.
Claim 25
Dependent Claim
16 words
An article according to claim I having a taber stiffness of from 20 to 50 g-cm.
Claim 26
Dependent Claim
193 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes some thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; the thermobonded mixture comprising a core, the article having a backing sheet mounted to one side of the core and a face sheet mounted to another side of the core; and the face sheet containing a thermoplastic material and being heat bonded to the core, and in which there is a pattern of bonded areas in the field of the article, the article having a Z direction tensile strength at the densified edge margin of fiberous material of greater than 25 KN/m 2 , but not greater than the breaking point of the materials, when dry, a basis weight of from 200 to 350 g/m 2 , a density at the densified edge margin from 0.3 to 1.0 g/cm 3 , and a taber stiffness of from 10 to 100 g-cm, the article comprising an infant seat liner having a lower leg supporting portion, a central seat supporting portion and an upper body supporting portion.
Claim 27
Dependent Claim
193 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes some thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; the thermobonded mixture comprising a core, the article having a backing sheet mounted to one side of the core and a face sheet mounted to another side of the core; and the face sheet containing a thermoplastic material and being heat bonded to the core, and in which there is a pattern of bonded areas in the field of the article, the article having a Z direction tensile strength at the densified edge margin of fiberous material of greater than 25 KN/m 2 , but not greater than the breaking point of the materials, when dry, a basis weight of from 200 to 350 g/m 2 , a density at the densified edge margin from 0.3 to 1.0 g/cm 3 , and a taber stiffness of from 10 to 100 g-cm, the article comprising an infant seat liner having a lower leg supporting portion, a central seat supporting portion and an upper body supporting portion.
Claim 28
Dependent Claim
14 words
An article according to claim 23 in which the core contains a superabsorbent material.
Claim 29
Dependent Claim
46 words
An article according to claim 23 in which the Z tensile strength at the densified edge margin is greater than 50 KN/m 2 , but not greater than the breaking point of the materials, when dry and the taber stiffness is from 20 to 50 g-cm.
Claim 30
Dependent Claim
34 words
An article according to claim 23 in which the bonded areas in the field of the article occupy from at least about two to about four percent of the surface area of the article.
Claim 31
Dependent Claim
24 words
An article according to claim 23 in which there are less than ten bonded areas per square inch in the field of the article.
Claim 32
Dependent Claim
42 words
An article according to claim 23 in which the core is comprised of thermoplastic fibers in a weight percentage of from 5 to 40 and in which the other fibers comprise wood pulp in a weight percentage of from 95 to 60.
Claim 33
Dependent Claim
43 words
An article according to claim 16 in which the core is comprised of thermoplastic fibers in a weight percentage of from 5 to 40 and in which the other weight fibers comprise wood pulp in a weight percentage of from 95 to 60.
Claim 34
Dependent Claim
42 words
An article according to claim 1 in which the core is comprised of thermoplastic fibers in a weight percentage of from 5 to 40 and in which the other fibers comprise wood pulp in a weight percentage of from 95 to 60.
Claim 35
Dependent Claim
38 words
An article according to claim S in which the core is comprised of thermoplastic fibers in a weight percentage of about 20 and in which the other fibers comprise wood pulp in a weight percentage of about 80.
Claim 36
Dependent Claim
42 words
An article according to claim 1 in which the core is comprised of thermoplastic fibers in a weight percentage of from 95 to 60 and in which the other fibers comprise wood pulp in a weight percentage of from 5 to 40.
Claim 37
Dependent Claim
100 words
An absorbent article having a core comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; and a facing sheet and a backing sheet which each contain a thermoplastic material, the facing and backing sheets being heat bonded to the core, and the core, facing and backing sheets being densified and bonded about the periphery of the article and being densified and bonded at a pattern of field bond locations within the field of the article.
Claim 38
Dependent Claim
100 words
An absorbent article having a core comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; and a facing sheet and a backing sheet which each contain a thermoplastic material, the facing and backing sheets being heat bonded to the core, and the core, facing and backing sheets being densified and bonded about the periphery of the article and being densified and bonded at a pattern of field bond locations within the field of the article.
Claim 39
Dependent Claim
20 words
An article according to claim 33 in which the facing and backing sheets are each of a liquid permeable material.
Claim 40
Dependent Claim
22 words
An article according to claim 34 in which the field bond locations comprise point bonds that are spaced approximately two inches apart.
Claim 41
Dependent Claim
45 words
An article according to claim 35 comprising a towel having a basis weight of approximately 175 g/m 2 , a density of approximately 0.5 g/cm 3 , a taber stiffness of approximately from 5 to 6 g-cm, and an absorbency of approximately from 10-15 ml/g.
Claim 42
Dependent Claim
17 words
An article according to claim 34 having a basis weight of greater than 500 g/m 2 .
Claim 43
Dependent Claim
28 words
An article according to claim 34 in which the article comprises a mat with a core having a basis weight approximately no less than 700 g/m 2 .
Claim 44
Dependent Claim
21 words
An article according to claim 38 in which the article comprises a mat having a taber stiffness of approximately 250 g-cm.
Claim 45
Dependent Claim
31 words
An article according to claim 38 in which the pattern of bond areas comprises a quilted pattern of intersecting parallel bond lines, the parallel lines being spaced approximately one inch apart.
Claim 46
Dependent Claim
10 words
An article according to claim 1 including a superabsorbent material.
Claim 47
Dependent Claim
11 words
An article according to claim 1 including a moisture absorbing material.
Claim 48
Dependent Claim
13 words
An article according to claim 1 including an oil absorbing particulate polymer material.
Claim 49
Dependent Claim
42 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; and including a deodorizing material.
Claim 50
Dependent Claim
42 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a densified peripheral edge margin of fiberous material along at least a section of the article; and including a deodorizing material.
Claim 51
Dependent Claim
59 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a bonded densified periphery of fibrous material and at least one elongated bond area separating the article into at least two compartments, whereby the elongated bond area provides a fold line about which the article may be folded.
Claim 52
Dependent Claim
59 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a bonded densified periphery of fibrous material and at least one elongated bond area separating the article into at least two compartments, whereby the elongated bond area provides a fold line about which the article may be folded.
Claim 53
Dependent Claim
21 words
An article according to claim 45 which is also bonded together at densified bond areas within the field of the article.
Claim 54
Dependent Claim
62 words
An article according to claim 46 in which the thermobonded mixture comprises a core, the article having a backing sheet of a thermoplastic containing liquid impermeable material mounted to the core, and a face sheet of a thermoplastic containing liquid permeable material, the face sheet being bonded to the core and being heat bonded and densified at the periphery of the article.
Claim 55
Dependent Claim
66 words
An article according to claim 47 having a first set of at least two spaced-apart transverse bond lines each extending across the article in a first direction and a second set of at least one bond line extending across the article in a second direction normal to the first direction, the bond lines separating the article into plural compartments and defining fold lines for the article.
Claim 56
Dependent Claim
84 words
An article according to claim 48 in which the bond lines of the first set are generally equally spaced apart by a first distance and in which there are at least two bond lines of the second set spaced apart a second distance which is substantially smaller than the first distance, whereby the article may be folded about the bond lines of the first set and then about the at least two bond lines of the second set to provide a compact folded article.
Claim 57
Dependent Claim
51 words
A changing pad according to claim 49 in which the pad is of a generally rectangular shape and which the bond lines of the first set are parallel to one edge of the pad and the bond lines of the second set are normal to the one edge of the pad.
Claim 58
Dependent Claim
109 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a bonded densified peripheral edge margin of fibrous material along at least a section of the article, the mixture of fibers comprising first thermoplastic fibers of a first length greater than about one half-inch in a weight percentage of the core of from about 1 to 15, second thermoplastic fibers of a second length shorter than the first length in a weight percentage of the core of from about 5 to 85, and wood pulp fibers in a weight percentage of the core of about 5 to 95.
Claim 59
Dependent Claim
109 words
An absorbent article comprised of a thermobonded mixture of fibrous material which includes thermoplastic fibers, the article having a field and a bonded densified peripheral edge margin of fibrous material along at least a section of the article, the mixture of fibers comprising first thermoplastic fibers of a first length greater than about one half-inch in a weight percentage of the core of from about 1 to 15, second thermoplastic fibers of a second length shorter than the first length in a weight percentage of the core of from about 5 to 85, and wood pulp fibers in a weight percentage of the core of about 5 to 95.
Claim 60
Dependent Claim
27 words
An article according to claim 51 including a thermoplastic containing facing sheet which is both thermobonded to the core and densified at the periphery of the article.
Claim 61
Dependent Claim
16 words
An article according to claim 52 including a thermoplastic containing backing sheet bonded to the core.
Claim 62
Dependent Claim
19 words
An article according to claim 53 including a pattern of heat bond locations in the field of the article.
Claim 63
Dependent Claim
57 words
An absorbent article comprised of a mixture of fibrous material which includes thermoplastic fibers having at least one bonded densified region of fiberous material and a weakened region positioned in the densified region to define a tear line so as to permit selective severing of the portion of the article along the tear line and weakened region.
Claim 64
Dependent Claim
57 words
An absorbent article comprised of a mixture of fibrous material which includes thermoplastic fibers having at least one bonded densified region of fiberous material and a weakened region positioned in the densified region to define a tear line so as to permit selective severing of the portion of the article along the tear line and weakened region.
Claim 65
Dependent Claim
18 words
An article according to claim 55 in which the weakened region comprises perforations positioned in the densified region.
Claim 66
Dependent Claim
36 words
An article according to claim 56 in which the densified region is positioned along at least a portion of the periphery of the article so as to provide a soft edge along the periphery when severed.
Claim 67
Dependent Claim
64 words
An article according to claim 57 in which the thermobonded mixture comprises a core, the article having a backing sheet of a thermoplastic containing liquid impermeable material mounted to the core and a face sheet of a thermoplastic containing liquid permeable material, the face sheet being heat bonded to the core, the perforations extending through the face sheet, the core and the backing sheet.
Claim 68
Dependent Claim
23 words
An article according to claim 58 in which the face sheet and backing sheet are also densified in the area of the perforations.
Claim 69
Dependent Claim
68 words
An article according to claim 55 bonded at its periphery by a bonded densified region and having at least one bonded an densified area positioned at least partially in the field of the article, the weakened area being positioned in such latter densified region to define a tear line so as to permit selective severing of the portion of the article along the tear line and weakened area.
Claim 70
Dependent Claim
67 words
An article according to claim 60 in which the thermobonded mixture comprises a core, the article having a backing sheet of a thermoplastic containing liquid impermeable material mounted to the core and a face sheet of a thermoplastic containing liquid permeable material, the face sheet being heat bonded to the core, the weakened areas comprising performations extending through the face sheet, the core and the backing sheet.
Claim 71
Dependent Claim
23 words
An article according to claim 61 in which the face sheet and backing sheet are also densified in the area of the perforations.
Claim 72
Dependent Claim
115 words
A limited life absorbent article with a field or body bounded by a peripheral edge, the article comprising a backing sheet of a thermoplastic containing material, a liquid permeable face sheet of thermoplastic containing material, an absorbent core located between the backing sheet and the face sheet, the absorbent core comprising a thermobonded mixture of fibrous material which includes thermoplastic fibers, the core extending substantially to the peripheral edge of the article, the core, backing sheet and face sheet being compressed and bonded together at the peripheral edge of the article, and at least the core and face sheet being bonded together by a spaced pattern of bond areas in the field to the article.
Claim 73
Dependent Claim
115 words
A limited life absorbent article with a field or body bounded by a peripheral edge, the article comprising a backing sheet of a thermoplastic containing material, a liquid permeable face sheet of thermoplastic containing material, an absorbent core located between the backing sheet and the face sheet, the absorbent core comprising a thermobonded mixture of fibrous material which includes thermoplastic fibers, the core extending substantially to the peripheral edge of the article, the core, backing sheet and face sheet being compressed and bonded together at the peripheral edge of the article, and at least the core and face sheet being bonded together by a spaced pattern of bond areas in the field to the article.
Claim 74
Dependent Claim
24 words
An article according to claim 63 in which the core is comprised of thermoplastic fibers having a diameter of greater than approximately nine microns.
Claim 75
Dependent Claim
53 words
An article according to claim 64 in which the density of the thermobonded peripheral edge is from approximately 0.3 to 1.0 g/cm 3 and the edge has a tensile strength in the Z direction of greater than 20 KN/m 2 , but not greater than the breaking point of the materials, when wet.
Claim 76
Dependent Claim
23 words
An article according to claim 64 in which the basis weight of the core is from approximately 150 to 300 g/m 2 .
Claim 77
Dependent Claim
37 words
An article according to claim 66 in which the spaced pattern of bonds is less than approximately twenty bonds per square inch, and in which the bulk of the article is from approximately 10 to 30 cc/gm.
Claim 78
Dependent Claim
195 words
An article according to claim 63 in which the core is comprised of thermoplastic fibers having a diameter of greater than approximately nine microns, in which the density of the thermobonded peripheral edge is approximately from 0.3 to 1.0 g/cm 3 and the edge has a Z direction dry tensile strength of greater than, but not greater than the breaking point of the materials, approximately 50 KN/m 2 , in which the basis weight of the core is approximately from 150 to 300 g/m 2 , in which the spaced pattern of bonds is less than approximately twenty bonds per square inch, in which the bulk of the article is approximately from 10 to 30 cc/gm, the article being formed from a generally planar web having a cross machine direction and a machine direction, the dry tensile strength of the article in a direction perpendicular to a plane containing the article and at locations other than the edge and bond areas is from approximately 1 to 10 KN/m 2 , and the ratio of wet to dry tensile strengths of the article in the machine and cross machine directions is from approximately 0.5 to 1.0.
Claim 79
Dependent Claim
70 words
A limited life absorbent article having a field and an edge, the article comprising: a uniformly mixed blend of wood pulp fibers and synthetic thermoplastic fibers; said article having a pair of major opposed outer surfaces; said major opposed outer surfaces of the article being compressed and heat sealed at spaced locations within the field of the article; and the entire edge of said article being compressed and heat sealed.
Claim 80
Dependent Claim
70 words
A limited life absorbent article having a field and an edge, the article comprising: a uniformly mixed blend of wood pulp fibers and synthetic thermoplastic fibers; said article having a pair of major opposed outer surfaces; said major opposed outer surfaces of the article being compressed and heat sealed at spaced locations within the field of the article; and the entire edge of said article being compressed and heat sealed.
Claim 81
Dependent Claim
47 words
The article of claim 69 further comprising a cover enclosing said article to form a pair of outer cover layers; and said core and at least one of said pair of cover layers being compressed and heat sealed together at said spaced locations and along said edge.
Claim 82
Dependent Claim
14 words
The article of claim 69 in which the blend also includes synthetic non-thermoplastic fibers.
Claim 83
Dependent Claim
158 words
A limited life absorbent article comprising: a core comprising a uniformly mixed blend of wood pulp fibers and first and second synthetic thermoplastic fibers, the first and second synthetic thermoplastic fibers having different melting points; said second thermoplastic fiber having a higher melting point than said first thermoplastic fiber; the core being head fused together at a temperature at least at the melting point of the first of the thermoplastic fibers and below the melting point of the second of the thermoplastic fibers so as to preserve the integrity of the second of the thermoplastic fibers; a cover comprising a first sheet and a second sheet enclosing said core to form a pair of outer cover layers; said core and said first and second sheets being compressed and sealed together at spaced locations; the article having a Z direction wet strength of at least 20 KN/m 2 , but not greater than the breaking point of the materials.
Claim 84
Dependent Claim
158 words
A limited life absorbent article comprising: a core comprising a uniformly mixed blend of wood pulp fibers and first and second synthetic thermoplastic fibers, the first and second synthetic thermoplastic fibers having different melting points; said second thermoplastic fiber having a higher melting point than said first thermoplastic fiber; the core being head fused together at a temperature at least at the melting point of the first of the thermoplastic fibers and below the melting point of the second of the thermoplastic fibers so as to preserve the integrity of the second of the thermoplastic fibers; a cover comprising a first sheet and a second sheet enclosing said core to form a pair of outer cover layers; said core and said first and second sheets being compressed and sealed together at spaced locations; the article having a Z direction wet strength of at least 20 KN/m 2 , but not greater than the breaking point of the materials.
Claim 85
Dependent Claim
15 words
An article according to claim 72 in which the blend also includes synthetic non-thermoplastic fibers.
Claim 86
Dependent Claim
15 words
An article according to claim 72 wherein said first synthetic thermoplastic fiber is a polyolefin.
Claim 87
Dependent Claim
15 words
An article according to claim 74 wherein said second synthetic thermoplastic fiber is a polyester.
Claim 88
Dependent Claim
15 words
An article according to claim 74 in which said synthetic thermoplastic fibers are bicomponent fibers.
Claim 89
Dependent Claim
18 words
An article according to claim 74 in which said thermoplastic fibers are shorter than said wood pulp fibers.
Claim 90
Dependent Claim
18 words
An article according to claim 74 in which said thermoplastic fibers are longer than said wood pulp fibers.
Claim 91
Dependent Claim
21 words
An article according to claim 74 in which the second of said thermoplastic fibers are longer than said wood pulp fibers.
Claim 92
Dependent Claim
47 words
An article according to claim 79 in which the second thermoplastic fibers are generally at least one half-inch in length and comprise from 1 to 15 percent by weight of the core, the first synthetic fibers comprising from 5 to 85 percent by weight of the core.
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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) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |