US4813948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwebs and nonwoven materials containing microwebs
Assignee: 3M Co
•
Filing: 1987-09-01
•
Granted: 1989-03-21
•
Expires: 2007-09-01
Abstract
Abstract Microfiber microwebs are provided. The microfiber microwebs have relatively dense nuclei with individual fibers and/or fiber bundles protruding therefrom. The microfiber microwebs can be incorporated into nonwoven webs of blown microfibers, air-laid staple fibers, or wood pulp fibers as well as into shaped articles having porous covering materials. The microfiber microwebs are useful in sorbent, filtration, and thermal insulation materials. The microfiber microwebs are prepared by divellicating a microfiber web to form discrete particles of microfiber microwebs.
Inventors
- 👤 Thomas I. Insley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:48
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4391; A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/531; A61F13/532; D04H1/04; D04H1/26; D04H1/54; D04H1/56; D04H1/58; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10S428/913; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23957; Y10T428/249921; Y10T428/25; Y10T428/253; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/619
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
15 words
Microfiber microwebs comprising relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom.
Claim 2
Dependent Claim
15 words
Microfiber microwebs comprising relatively dense microfiber nuclei with individual fibers and/or fiber bundles protruding therefrom.
Claim 3
Dependent Claim
19 words
The microfiber microwebs of claim 1 wherein said nuclei have an average diameter of about 0.05 to 4 mm.
Claim 4
Dependent Claim
30 words
The microfiber microwebs of claim 1 wherein said fibers and/or fiber bundles extend from said nucleus to provide said microweb with a total diameter of about 0.07 to 10 mm.
Claim 5
Dependent Claim
10 words
The microfiber microwebs of claim 1 further comprising particulate material.
Claim 6
Dependent Claim
14 words
The microfiber microweb of claim 4 wherein said particulate material is sorbent particulate material.
Claim 7
Dependent Claim
18 words
A nonwoven web comprising carrier fibers and microfiber microwebs dispersed among the carrier fibers according to claim 1.
Claim 8
Dependent Claim
13 words
The nonwoven web of claim 6 wherein said carrier fibers are blown fibers.
Claim 9
Dependent Claim
14 words
The nonwoven web of claim 7 wherein said blown fibers are melt blown microfibers.
Claim 10
Dependent Claim
14 words
The nonwoven web of claim 8 wherein said nonwoven web further contains staple fibers.
Claim 11
Dependent Claim
14 words
The nonwoven web of claim 9 wherein said staple fibers are crimped bulking fibers.
Claim 12
Dependent Claim
14 words
The nonwoven web of claim 7 wherein said microwebs further contain sorbent particulate material.
Claim 13
Dependent Claim
14 words
The nonwoven web of claim 6 wherein said carrier fibers are air-laid staple fibers.
Claim 14
Dependent Claim
14 words
The nonwoven web of claim 6 wherein said carrier fibers are wood pulp fibers.
Claim 15
Dependent Claim
17 words
A sorbent article comprising a nonwoven web comprising carrier fibers and microfiber microwebs according to claim 1.
Claim 16
Dependent Claim
17 words
A disposable diaper comprising a nonwoven web comprising carrier fibers and microfiber microwebs according to claim 1.
Claim 17
Dependent Claim
17 words
A catamenial device comprising a nonwoven web comprising carrier fibers and microfiber microwebs according to claim 1.
Claim 18
Dependent Claim
17 words
An incontinent device comprising a nonwoven web comprising carrier fibers and microfiber microwebs according to claim 1.
Claim 19
Dependent Claim
17 words
A surgical dressing comprising a nonwoven web comprising carrier fibers and microfiber microwebs according to claim 1.
Claim 20
Dependent Claim
17 words
A shaped article comprising a porous covering material having contained therein microfiber microwebs according to claim 1.
Claim 21
Dependent Claim
17 words
Sorbent materials comprising carrier fibers and microfiber microwebs dispersed among said carrier fibers according to claim 1.
Claim 22
Dependent Claim
9 words
Sorbent materials of claim 20 further comprising particulate material.
Claim 23
Dependent Claim
17 words
Filtration media comprising carrier fibers and microfiber microwebs dispersed among said carrier fibers according to claim 1.
Claim 24
Dependent Claim
16 words
Thermal insulation comprising carrier fibers microfiber microwebs dispersed among said carrier fibers according to claim 1.
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |