US5057368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filaments having trilobal or quadrilobal cross-sections
Assignee: Honeywell International Inc
•
Filing: 1989-12-21
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Granted: 1991-10-15
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Expires: 2009-12-21
Abstract
Abstract A trilobal or quadrilobal fiber formed from thermoplastic polymers, said fiber having a cross-section comprised of a central core having three or four T-shaped lobes, the legs of each intersecting at the center of said core such that the angle between the legs of adjacent lobes is from about 80° to about 130°.
Inventors
- 👤 Theodore Largman
- 👤 Fred J. Gefri
- 👤 Frank Mares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:10
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/298
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
186 words
Multilobal fibers composed of a thermoplastic polymer, said fiber having a cross-section comprised of a central core having three or four T-shaped lobes projecting therefrom, each of said T-shaped lobes having a leg and a cap, the legs of each of said lobes intersecting at the center of said core such that the angle between the legs of adjacent T-shaped lobes is in the range of from about 80° to about 130°, the legs of each of said T-shaped lobes having an average length, "W 1 ", of from about 4.5 to about 25 μm. from the center of sa1d central core, and an average width, "W t ", of from about 0.5 to about 20 μm, the caps of each of said T-shaped lobes having an average length, "C l ", of from about 4.5 to about 50 μm and each of the caps having an average width, C t ", of from about 0.5 to about 20 μm, wherein the relative values of W 1 , W t , C 1 and C t are selected such that: C.sub.1 (max)=2W.sub.1 -2C.sub.t and C.sub.1 (min)=2W.sub.t.
Claim 2
Dependent Claim
186 words
Multilobal fibers composed of a thermoplastic polymer, said fiber having a cross-section comprised of a central core having three or four T-shaped lobes projecting therefrom, each of said T-shaped lobes having a leg and a cap, the legs of each of said lobes intersecting at the center of said core such that the angle between the legs of adjacent T-shaped lobes is in the range of from about 80° to about 130°, the legs of each of said T-shaped lobes having an average length, "W 1 ", of from about 4.5 to about 25 μm. from the center of sa1d central core, and an average width, "W t ", of from about 0.5 to about 20 μm, the caps of each of said T-shaped lobes having an average length, "C l ", of from about 4.5 to about 50 μm and each of the caps having an average width, C t ", of from about 0.5 to about 20 μm, wherein the relative values of W 1 , W t , C 1 and C t are selected such that: C.sub.1 (max)=2W.sub.1 -2C.sub.t and C.sub.1 (min)=2W.sub.t.
Claim 3
Dependent Claim
20 words
A fiber according to claim 1 wherein the length of said legs is from about 4.5 to about 890 μm.
Claim 4
Dependent Claim
20 words
A fiber according to claim 2 wherein the length of said legs is from about 4.5 to about 100 μm.
Claim 5
Dependent Claim
20 words
A fiber according to claim 1 wherein the width of said legs is from about 0.5 to about 90 μm.
Claim 6
Dependent Claim
20 words
A fiber according to claim 4 wherein the width of said legs is from about 0.5 to about 80 μm.
Claim 7
Dependent Claim
20 words
A fiber according to claim 1 wherein the length of said caps is from about 4.5 to about 1600 μm.
Claim 8
Dependent Claim
20 words
A fiber according to claim 6 wherein the length of said caps is from about 4.5 to about 120 μm.
Claim 9
Dependent Claim
20 words
A fiber according to claim 1 wherein the width of said caps is from about 0.5 to about 90 μm.
Claim 10
Dependent Claim
20 words
A fiber according to claim 8 wherein the width of said caps is from about 0.5 to about 80 μm.
Claim 11
Dependent Claim
21 words
A fiber according to claim 1 wherein said thermoplastic polymer is a nylon, a polyester, a polyolefin or a combination thereof.
Claim 12
Dependent Claim
17 words
A fiber according to claim 1 having a modification ratio of from about 1.5 to about 10.
Claim 13
Dependent Claim
23 words
A fiber according to claim 10 wherein said polymer is a nylon selected from the group consisting of nylon 6 and nylon 66.
Claim 14
Dependent Claim
18 words
A fiber according to claim 10 wherein said fiber comprises a mixture of a polyester and a polyolefin.
Claim 15
Dependent Claim
17 words
A fiber according to claim 13 wherein said polyester is poly(ethylene terephthalate) and said polyolefin is polypropylene.
Claim 16
Dependent Claim
38 words
A fiber according to claim 1 wherein said fiber is a trilobal fiber in which the angle between adjacent lobes is about 120° and wherein the lengths of the legs of the lobes are equal or substantially equal.
Claim 17
Dependent Claim
41 words
A fiber according to claim 1 wherein said fiber is a quadrilobal fiber in which the angle between the legs of adjacent lobes is about 90°, and wherein the lengths of the legs of said lobes are equal or substantially equal.
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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) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |