Patent US3729005A successfully refreshed from Google Patents.
US3729005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable diaper
Assignee: International Paper Co
•
Filing: 1971-02-01
•
Granted: 1973-04-24
•
Expires: 1991-02-01
Abstract
Abstract A disposable diaper of generally rectangular outline having longitudinal and transverse directions including a pad of absorbent matter encompassed by a cover sheet comprising a laminated nonwoven fibrous fabric including fibrous web plies having respective longitudinal directions, the web plies being reinforced in their respective longitudinal directions and bonded in superposed relation with their respective longitudinal directions at angle to each other and at angle to the longitudinal direction of the diaper thereby reinforcing the diaper at angles to its longitudinal and transverse directions. The diaper includes wing folds extending longitudinally along the side edges of the diaper to provide a seal around the legs of the child and prevent body exudate from passing outwardly of the diaper in the vicinity of the legs. In one aspect of the inveniton, fibers of the web plies are bonded to the reinforcing medium in a manner such that the fibers are retained in the fabric cover sheet and do not become dislodged to deposit upon the child or other surface even though the diaper becomes wet and is subected to abrasion in the course of normal movements of the child. The desirable absorptivity of the fibrous webs is retained in the product.
Inventors
- 👤 C Lee
- 👤 F Sorrells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:58
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/45; A61F13/49; A61F13/494; A61F13/49406; A61F13/53; A61F13/534; A61F13/53409; A61F13/53418
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
323 words
A disposable diaper of rectangular outline having longitudinal and transverse dimensions comprising a pad of absorbent matter, a cover sheet encompassing said pad to form an encompassed assemblage, the opposite side margins of said encompassed assemblage being folded along longitudinal fold lines inwardly toward the longitudinal centerline of said assemblage and further folded along longitudinal fold lines back upon themselves to define wing folds extending along the opposite side edges of said diaper, said cover sheet comprising laminated nonwoven fabric having longitudinal and transverse directions including a first web ply, a first ply of discrete linear reinforcements aligned generally in the longitudinal direction of said first web ply and bonded thereto to reinforce it in its longitudinal direction, a second web ply, a second ply of discrete linear reinforcements aligned generally in the longitudinal direction of said second web ply and bonded to said second web ply to reinforce it in its longitudinal direction, each of said web plies comprising creped tissue having a basis weight between about 5 and about 10 pounds per 2,880 square feet and a crepe ratio between about 1.2 and about 1.5, said first and second web plies being bonded together and disposed with their longitudinal directions crossing each other and directed obliquely with respect to the longitudinal and transverse directions of said fabric, said reinforced directions of the respective plies of said fabric being disposed at angle to the longitudinal direction of said diaper, said reinforcements being spaced apart on a respective web ply by a distance about twice the usual fiber length of the fibers of said webs and extending into substantially all areas of said diaper and being bonded one to another at their crossings to develop a system of interconnected reinforcements defining regions between adjacent interconnected filaments encompassing fibers therein which are bonded to not more than one reinforcing filament leaving substantial portions of such fibers free to work as the diaper is stressed.
Claim 2
Dependent Claim
323 words
A disposable diaper of rectangular outline having longitudinal and transverse dimensions comprising a pad of absorbent matter, a cover sheet encompassing said pad to form an encompassed assemblage, the opposite side margins of said encompassed assemblage being folded along longitudinal fold lines inwardly toward the longitudinal centerline of said assemblage and further folded along longitudinal fold lines back upon themselves to define wing folds extending along the opposite side edges of said diaper, said cover sheet comprising laminated nonwoven fabric having longitudinal and transverse directions including a first web ply, a first ply of discrete linear reinforcements aligned generally in the longitudinal direction of said first web ply and bonded thereto to reinforce it in its longitudinal direction, a second web ply, a second ply of discrete linear reinforcements aligned generally in the longitudinal direction of said second web ply and bonded to said second web ply to reinforce it in its longitudinal direction, each of said web plies comprising creped tissue having a basis weight between about 5 and about 10 pounds per 2,880 square feet and a crepe ratio between about 1.2 and about 1.5, said first and second web plies being bonded together and disposed with their longitudinal directions crossing each other and directed obliquely with respect to the longitudinal and transverse directions of said fabric, said reinforced directions of the respective plies of said fabric being disposed at angle to the longitudinal direction of said diaper, said reinforcements being spaced apart on a respective web ply by a distance about twice the usual fiber length of the fibers of said webs and extending into substantially all areas of said diaper and being bonded one to another at their crossings to develop a system of interconnected reinforcements defining regions between adjacent interconnected filaments encompassing fibers therein which are bonded to not more than one reinforcing filament leaving substantial portions of such fibers free to work as the diaper is stressed.
Claim 3
Dependent Claim
82 words
The disposable diaper of claim 1 wherein said pad of absorptive matter terminates inwardly from the side edges of said cover sheet by an amount such that when said encompassed assemblage is folded into wing folds from the side edges of said cover sheet said pad is included in the first fold of each wing fold and the upper fold of each of said wing folds is free of said pad thereby reducing the transport of fluid exudate into said upper fold.
Claim 4
Dependent Claim
48 words
The disposable diaper of claim 1 wherein said linear reinforcements are extensible and when said diaper is stressed, said creped webs extend to absorb the initial stress and said linear reinforcements assume the stress as the webs approach their rupture stress, thereby providing a strong extensible nonwoven diaper.
Claim 5
Dependent Claim
71 words
The disposable diaper of claim 1 wherein said linear reinforcements of said webs are spaced apart from one another by a distance such that when said reinforcements are bonded to said webs many of the fibers of each web are bonded to at least one reinforcement and thereby are retained adhered to said reinforcement and are not dislodged from said diaper even though said fibers become loosened from their respective web.
Claim 6
Dependent Claim
44 words
The disposable diaper of claim 1 wherein said quantity of absorptive matter terminates inwardly from opposite ends of said diaper to leave said encapsulating cover sheet free of such absorptive matter in the regions thereof which encircle the waist when said diaper is worn.
Claim 7
Dependent Claim
46 words
The disposable diaper of claim 1 and including a moisture barrier substantially coextensive in length and breadth as said absorptive matter and interposed between said absorptive matter and said cover sheet on that side of said absorptive matter opposite the side thereof which receives liquid exudate.
Claim 8
Dependent Claim
16 words
The disposable diaper of claim 6 wherein said moisture barrier is impervious to fluid body exudates.
Claim 9
Dependent Claim
14 words
The disposable diaper of claim 7 wherein said moisture barrier comprises a plastic sheet.
Claim 10
Dependent Claim
77 words
The disposable diaper of claim 6 wherein said moisutre barrier is pervious to air to permit significant transfer of air therethrough and limitedly pervious to liquid body exudates thereby restricting the transfer of such exudates whereby said cover sheet receives a limited amount of wetting during the interval between a period of discharge of body exudate into the diaper and its subsequent removal from the body of the wearer and does not become wet to the touch.
Claim 11
Dependent Claim
18 words
The disposable diaper of claIm 9 wherein said moisture barrier comprises a cellulosic sheet including a water repellent.
Claim 12
Dependent Claim
19 words
The disposable diaper of claim 1 and including an adhesive bonding said plies one to another in superposed relation.
Claim 13
Dependent Claim
30 words
The disposable diaper of claim 1 wherein said filaments are thermoplastic and said plies are bonded one to another by heating said filaments while said plies are in superposed relation.
Claim 14
Dependent Claim
17 words
The disposable diaper of claim 1 wherein said filaments comprise nylon of about 40 denier per filament.
Claim 15
Dependent Claim
37 words
The disposable diaper of claim 1 wherein said plies of linear reinforcements each comprise a plurality of spaced apart lines of a thermoplastic which are aligned generally parallel to the longitudinal direction of the respective web ply.
Claim 16
Dependent Claim
25 words
The disposable diaper of claim 14 wherein said lines of thermoplastic are spaced apart of the order of five lines per inch of web width.
References Cited (Backward Citations)
US2295439A
Cited
US3036573A
Cited
US3063454A
Cited
US3085309A
Cited
US3180335A
Cited
US3430629A
Cited
US3402715A
Cited
US3544420A
Cited
US3543756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |