US4118531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web of blended microfibers and crimped bulking fibers
Assignee: 3M Co
•
Filing: 1977-11-04
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Granted: 1978-10-03
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Expires: 1997-11-04
Abstract
Abstract Mixtures of microfibers and crimped bulking fibers produce a lofty resilient web having properties that are unique for microfiber-based webs. Included in these properties are a combination of high thermal resistance per unit of thickness and moderate weight, as well as other properties which give the web a distinctive utility as thermal insulation.
Inventors
- 👤 Edward R. Hauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:46
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; D; D04; D04H; D04H1/00; D04H1/40; D04H1/413; D04H1/42; D04H1/4382; D04H1/43835; D04H1/43838; D04H1/4391; D04H1/43918; D04H1/54; D04H1/56; D04H1/70; D04H1/72; D04H1/732; D04H5/00; D04H5/02; D04H5/06; D04H5/08; B01D2239/00; B01D2239/02; B01D2239/025; B01D2239/04; B01D2239/0407; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/064; B01D2239/12; B01D2239/1233; B29; B29C; B29C43/00; B29C43/02; B29C43/021; B29C2043/023; B29C2043/025; B29C43/22; B29C43/222; B29C43/32; B29C43/44; B29C43/48; B29K; B29K2105/00; B29K2105/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/2922; Y10T428/2927; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/619; Y10T442/627
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
A fibrous web comprising microfibers that average less than about 10 micrometers in diameter and crimped bulking fibers that have a percent crimp of at least about 15 percent, the microfibers and crimped bulking fibers being present in a weight ratio between about 9:1 and 1:9 and being randomly and thoroughly intermixed and intertangled with one another to form a resiliently compressible fiber structure that has a loft of at least 30 cubic centimeters/gram.
Claim 2
Dependent Claim
74 words
A fibrous web comprising microfibers that average less than about 10 micrometers in diameter and crimped bulking fibers that have a percent crimp of at least about 15 percent, the microfibers and crimped bulking fibers being present in a weight ratio between about 9:1 and 1:9 and being randomly and thoroughly intermixed and intertangled with one another to form a resiliently compressible fiber structure that has a loft of at least 30 cubic centimeters/gram.
Claim 3
Dependent Claim
31 words
A web as defined in claim 1 in which the bulking fibers have a percent-crimp of at least 25 percent and a crimp count of at least 2 crimps per centimeter.
Claim 4
Dependent Claim
24 words
A web as defined in claim 1 in which the bulking fibers comprise between 25 and 75 weight-percent of the fibers in the web.
Claim 5
Dependent Claim
18 words
A web as defined in claim 1 which exhibits a loft of at least about 50 cubic centimeters/gram.
Claim 6
Dependent Claim
33 words
A web as defined in claim 1 which exhibits a thermal resistance of at least 1.5 clo/centimeter and a thermal insulating efficiency by weight of at least 10 × 10 -3 clo-square meter/gram.
Claim 7
Dependent Claim
121 words
A fibrous web useful as thermal insulation that provides a high thermal resistance per unit of thickness and is moderate in weight comprising microfibers that average less than about 10 micrometers in diameter and crimped bulking fibers having a percent crimp of at least about 15 percent, the microfibers and bulking fibers being present in a weight ratio between 9:1 and 1:3 and being randomly and thoroughly intermixed and intertangled with one another to form a resiliently compressible unbonded fiber structure having a loft of at least about 30 cubic centimeters/gram, and the web exhibiting a thermal resistance of at least about 1.3 clo/centimeter and a thermal insulating efficiency by weight of at least about 5 × 10 -3 clo-square meter/gram.
Claim 8
Dependent Claim
121 words
A fibrous web useful as thermal insulation that provides a high thermal resistance per unit of thickness and is moderate in weight comprising microfibers that average less than about 10 micrometers in diameter and crimped bulking fibers having a percent crimp of at least about 15 percent, the microfibers and bulking fibers being present in a weight ratio between 9:1 and 1:3 and being randomly and thoroughly intermixed and intertangled with one another to form a resiliently compressible unbonded fiber structure having a loft of at least about 30 cubic centimeters/gram, and the web exhibiting a thermal resistance of at least about 1.3 clo/centimeter and a thermal insulating efficiency by weight of at least about 5 × 10 -3 clo-square meter/gram.
Claim 9
Dependent Claim
23 words
A web as defined in claim 6 in which the weight ratio of microfibers to bulking fibers is between about 3:1 and 1:1.
Claim 10
Dependent Claim
24 words
A web as defined in claim 6 in which the bulking fibers have a crimp count of at least about 2 crimps per centimeter.
Claim 11
Dependent Claim
22 words
A web as defined in claim 8 in which the bulking fibers have a percent crimp of at least about 25 percent.
Claim 12
Dependent Claim
18 words
A web as defined in claim 6 which exhibits a loft of at least about 50 cubic centimeters/gram.
Claim 13
Dependent Claim
16 words
A web as defined in claim 1 which further includes solid particles contained within the web.
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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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |