US4018646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven fabric
Assignee: Johnson and Johnson
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Filing: 1975-10-29
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Granted: 1977-04-19
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Expires: 1995-10-29
Abstract
Abstract A novel web that can be produced by the process of the present invention is comprised of two different types of fibers, with the web characterized by having a predominance of one fiber type at one of its major faces, and a predominance of the other fiber type at the other of its major faces. The web includes a transition between the faces in which the predominance of the fibers decreases uniformly away from the face at which they predominate.
Inventors
- 👤 Angelo P. Ruffo
- 👤 Prashant K. Goyal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:53
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/26; D21H5/2607; D21H5/2628; D21H5/2642; D21H11/00; D21H13/00; D21H13/10; D21H13/28; D21H15/00; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
195 words
An air-laid nonwoven web having a thickness from about 1/32 inch to about 1 inch and having a pair of opposed major faces, comprised at one of said faces of a blend of a major proportion by weight of a staple length fiber having a length from about 1/2 inch to about 21/2 inches as a first fiber type and a minor proportion by weight of short cellulose fibers having a length less than about one-fourth inch as a second fiber type interspersed therewith, and comprises at said other face of a blend of a major proportion by weight of said second fiber type and a minor proportion by weight of said first fiber type interspersed therewith, the web between said faces being comprised of a blend of fibers exhibiting a continuous uniform transition in which the proportion of said first fiber in the blend becomes progressively and continuously less with distance from said one face while the proportion of said second fiber in the blend becomes progressively and continuously less with distance from said other face, each of said fiber types being present in an amount of at least 5% at each major face.
Claim 2
Dependent Claim
195 words
An air-laid nonwoven web having a thickness from about 1/32 inch to about 1 inch and having a pair of opposed major faces, comprised at one of said faces of a blend of a major proportion by weight of a staple length fiber having a length from about 1/2 inch to about 21/2 inches as a first fiber type and a minor proportion by weight of short cellulose fibers having a length less than about one-fourth inch as a second fiber type interspersed therewith, and comprises at said other face of a blend of a major proportion by weight of said second fiber type and a minor proportion by weight of said first fiber type interspersed therewith, the web between said faces being comprised of a blend of fibers exhibiting a continuous uniform transition in which the proportion of said first fiber in the blend becomes progressively and continuously less with distance from said one face while the proportion of said second fiber in the blend becomes progressively and continuously less with distance from said other face, each of said fiber types being present in an amount of at least 5% at each major face.
Claim 3
Dependent Claim
34 words
An air-laid nonwoven web according to claim 1 in which said cellulose fiber is a fiber of the group consisting of wood pulp fibers and cotton linters and said staple length fiber is rayon.
Claim 4
Dependent Claim
25 words
An air-laid non-woven web according to claim 1 in which one fiber face has from about 55 to about 95% of said short cellulose fibers.
Claim 5
Dependent Claim
22 words
An air-laid nonwoven web according to claim 1 wherein said web has an MD:CD ratio of between about 1:3 to about 5:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |