Patent US4957794A successfully refreshed from Google Patents.
US4957794A
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Aramid fluff
Assignee: EIDP Inc
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Filing: 1990-01-02
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Granted: 1990-09-18
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Expires: 2010-01-02
Abstract
Abstract A composition is disclosed which comprises a fluff of aramid fibers wherein some of the aramid fibers are in the form of balls of the fluff. The composition is particularly useful for insulation, absorption, cushioning, and the like.
Inventors
- 👤 Thomas I. Bair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:31
CPC Classifications
D; D01; D01G; D01G5/00; D01G1/00; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/4334; D04H1/4342; D04H1/70; D04H1/72; D04H1/732; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/237; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/627; Y10T442/632
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
43 words
Aramid fiber fluff comprising aramid fibers with an extended length of 0.4 to 3 centimeters and having at least two out-of-plane crimps along their length, the fluff exhibiting a density of less than 0.08 g/cc at a load of 0.26 N/cm 2 .
Claim 2
Dependent Claim
43 words
Aramid fiber fluff comprising aramid fibers with an extended length of 0.4 to 3 centimeters and having at least two out-of-plane crimps along their length, the fluff exhibiting a density of less than 0.08 g/cc at a load of 0.26 N/cm 2 .
Claim 3
Dependent Claim
13 words
The fluff of claim 1 wherein the density is less than 0.06 g/cc.
Claim 4
Dependent Claim
24 words
The fluff of claim 1 wherein the fibers of the fluff have a specific surface area of less than about 5.0 m 2 /g.
Claim 5
Dependent Claim
18 words
The fluff of claim 3 wherein the specific surface area is from 0.03 to 3 m 2 /g.
Claim 6
Dependent Claim
68 words
Aramid fiber fluff comprising aramid fibers with an extended length of 0.4 to 3 centimeters and having at least two out-of-plane crimps along their length, the fluff exhibiting a density of less than 0.08 g/cc at a load of 0.26 N/cm 2 and wherein there are more than 1 and less than 25 fluff balls per milligram of aramid fiber having a diameter of less than 10 millimeters.
Claim 7
Dependent Claim
68 words
Aramid fiber fluff comprising aramid fibers with an extended length of 0.4 to 3 centimeters and having at least two out-of-plane crimps along their length, the fluff exhibiting a density of less than 0.08 g/cc at a load of 0.26 N/cm 2 and wherein there are more than 1 and less than 25 fluff balls per milligram of aramid fiber having a diameter of less than 10 millimeters.
Claim 8
Dependent Claim
19 words
The fluff of claim 5 wherein the balls of aramid fibers have a diameter of less than 5 millimeters.
Claim 9
Dependent Claim
30 words
The aramid fiber fluff of claim 5 wherein the aramid fibers are selected from the group consisting of poly(p-phenylene terephthalamide), poly(m-phenylene isophthalamide), and mixtures of poly(p-phenylene terephthalamide) and poly(m-phenylene isophthalamide).
Claim 10
Dependent Claim
37 words
The aramid fiber fluff of claim 5 wherein the fluff is uniformly combined with thermoplastic fibers such that the combination is at least 20 weight percent aramid fluff and no more than 80 weight percent thermoplastic fibers.
Claim 11
Dependent Claim
12 words
The fluff of claim 8 wherein the thermoplastic fibers have been thermobonded.
Claim 12
Dependent Claim
13 words
The aramid fiber fluff of claim 8 wherein the thermoplastic fibers are poly(vinylchloride-co-vinylacetate).
Claim 13
Dependent Claim
20 words
The aramid fiber fluff combination of claim 8 wherein the fluff is 20 to 80 weight percent of the combination.
Claim 14
Dependent Claim
37 words
The aramid fiber fluff of claim 5 wherein the fluff is uniformly combined with aramid fibrids such that the combination is at least 70 weight percent aramid fluff and no more than 30 weight percent aramid fibrids.
Claim 15
Dependent Claim
15 words
The fluff of claim 12 wherein the fibrids hold the fluff in a mat shape.
Claim 16
Dependent Claim
14 words
The aramid fiber fluff of claim 12 wherein the aramid fibrids are poly(m-phenylene isophthalamide).
Claim 17
Dependent Claim
18 words
The aramid fiber fluff combination of claim 12 wherein the fluff is 70-97 weight percent of the combination.
Claim 18
Dependent Claim
55 words
A reusable liquid-absorbent sock comprising a porous fabric cover and a filler of aramid fluff comprising aramid fibers with an extended length of 0.4 to 3 centimeters and having at least two out-of-plane crimps along their length, the fluff exhibiting a density of less than 0.08 g/cc at a load of 0.26 N/cm 2 .
Claim 19
Dependent Claim
55 words
A reusable liquid-absorbent sock comprising a porous fabric cover and a filler of aramid fluff comprising aramid fibers with an extended length of 0.4 to 3 centimeters and having at least two out-of-plane crimps along their length, the fluff exhibiting a density of less than 0.08 g/cc at a load of 0.26 N/cm 2 .
Claim 20
Dependent Claim
34 words
The sock of claim 16 wherein the fluff has more than 1 and less than 25 fluff balls per milligram of aramid fiber and the balls have a diameter of less than 10 millimeters.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |