Patent US6556310B1 successfully refreshed from Google Patents.
US4908052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibers and filters containing said fibers
Assignee: Honeywell International Inc
•
Filing: 1989-01-23
•
Granted: 1990-03-13
•
Expires: 2009-01-23
Abstract
Abstract This invention relates to a fiber comprising a major amount of a continous phase comprising one or more melt processible polyesters of fiber forming molecular weight, and a minor amount of one or more polyolefins non-uniformly dispersed in said continuous phase such that the concentration of polyolefins at or near the surface of said fiber is greater than the concentration of polyesters at or near the surface of said fiber, and a process for preparing said fiber.
Inventors
- 👤 Theodore Largman
- 👤 Frank Mares
- 👤 Clarke A. Rodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:09
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/14; D01F6/00; D01F6/88; D01F6/92; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
115 words
A filter element for removal of entrained solid particles from a fluid stream, each element comprising: a body comprised of a network of fibers positioned to entrap all or a portion of said particles in said stream passing through said body, said fibers comprising a major amount of a continuous phase comprising one or more melt processible polyesters of fiber forming molecular weight and a minor amount of one or more melt processible polyolefins of fiber forming molecular weight dispersed in said continuous phase such that the concentration of said polyolefins at or near the surface of said fiber is greater than the concentration of said polyesters at or near the surface of said fibers.
Claim 2
Dependent Claim
115 words
A filter element for removal of entrained solid particles from a fluid stream, each element comprising: a body comprised of a network of fibers positioned to entrap all or a portion of said particles in said stream passing through said body, said fibers comprising a major amount of a continuous phase comprising one or more melt processible polyesters of fiber forming molecular weight and a minor amount of one or more melt processible polyolefins of fiber forming molecular weight dispersed in said continuous phase such that the concentration of said polyolefins at or near the surface of said fiber is greater than the concentration of said polyesters at or near the surface of said fibers.
Claim 3
Dependent Claim
26 words
A filter element according to claim 1 wherein said polyester is formed from the condensation of an aliphatic or cycloaliphatic diol, and an aromatic dicarboxylic acid.
Claim 4
Dependent Claim
26 words
A filter element according to claim 2 wherein said aromatic dicarboxylic acid is selected from the group consisting of terephthalic acid, isophthalic acid and orthophthalic acid.
Claim 5
Dependent Claim
15 words
A filter element according to claim 3 wherein said aromatic dicarboxylic acid is terephthalic acid.
Claim 6
Dependent Claim
14 words
A filter element according to claim 2 wherein said diol is an aliphatic diol.
Claim 7
Dependent Claim
25 words
A filter element according to claim 1 wherein said polyester is selected from the group consisting of poly(ethylene terephthalate), poly(butylene terephthalate) and poly(1,4-cyclohexane dimethylene terephthalate).
Claim 8
Dependent Claim
13 words
A filter element according to claim 6 wherein said polyester is poly(ethylene terephthalate).
Claim 9
Dependent Claim
42 words
A filter element according to claim 1 wherein said polyolefin is formed by polymerization of an olefin of the formula: R.sub.1 R.sub.2 CH═CH.sub.2 wherein R 1 and R 2 are the same or different and are alkylphenyl, phenylalkyl, phenyl, hydrogen or alkyl.
Claim 10
Dependent Claim
27 words
A filter element according to claim 8 wherein R 1 is hydrogen and R 2 is hydrogen or alkyl having from 1 to about 12 carbon atoms.
Claim 11
Dependent Claim
22 words
A filter element according to claim 9 wherein R 2 is hydrogen or alkyl having from 1 to about 8 carbon atoms.
Claim 12
Dependent Claim
22 words
A filter element according to claim 10 wherein R 2 is hydrogen or alkyl having from 1 to about 6 carbon atoms.
Claim 13
Dependent Claim
22 words
A filter element according to claim 11 wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene, poly(4-methyl-1-pentene) and polyisobutylene.
Claim 14
Dependent Claim
21 words
A filter element according to claim 12 wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene and poly(4-methyl-1-pentene).
Claim 15
Dependent Claim
14 words
A filter element according to claim 13 wherein said polyolefin is polypropylene or poly(4-methyl-1-pentene).
Claim 16
Dependent Claim
12 words
A filter element according to claim 14 wherein said polyolefin is polypropylene.
Claim 17
Dependent Claim
33 words
A filter element according to claim 1 wherein the amount of said polyolefins in said fiber is from about 0.5 to about 25 weight percent based on the total weight of the fiber.
Claim 18
Dependent Claim
25 words
A filter element according to claim 16 wherein the amount of said polyolefins in said fiber is from about 1 to about 15 weight percent.
Claim 19
Dependent Claim
24 words
A filter element according to claim 17 wherein the amount of polyolefins in said fiber is from about 2.5 to about 10 weight percent.
Claim 20
Dependent Claim
24 words
A filter element according to claim 18 wherein the amount of polyolefins in said fiber is from about 3 to about 8.5 weight percent.
Claim 21
Dependent Claim
61 words
A filter element according to claim 1 wherein the weight percent of polyolefin in the portion of the fiber forming a sheath about all or a portion of the longitudinal axis of the fiber of said sheath having a width of at least about 50 Å is at least about 50 weight percent based on the total weight of the sheath.
Claim 22
Dependent Claim
24 words
A filter element according to claim 20 wherein the amount of polyolefin contained in said sheath is at least about 80 percent by weight.
Claim 23
Dependent Claim
24 words
A filter element according to claim 21 wherein the amount of polyolefin contained in said sheath is at least about 85 percent by weight.
Claim 24
Dependent Claim
16 words
A filter element according to claim 1 wherein said polyolefin is of fiber forming molecular weight.
Claim 25
Dependent Claim
28 words
The filter element according to claim 22 wherein the amount of polyolefin in said sheath is from about 85 percent by weight to about 98 percent by weight.
Claim 26
Dependent Claim
18 words
A filter element according to claim 1 wherein said fiber is a filament or a plurality of filaments.
Claim 27
Dependent Claim
18 words
A filter element according to claim 25 wherein said fiber is a filament of substantially circular cross section.
Claim 28
Dependent Claim
17 words
A filter element according to claim 25 wherein said fiber is a filament of multilobal cross section.
Claim 29
Dependent Claim
30 words
A filter element according to claim 27 wherein said multilobal fiber has at least about 3 irregular or regular lobes or vanes projecting from the longitudinal axis of said fiber.
Claim 30
Dependent Claim
19 words
A filter element according to claim 28 wherein said fiber has at least about 4 projecting lobes or vanes.
Claim 31
Dependent Claim
19 words
A filter element according to claim 27 wherein the mod ratio of the fiber is at least about 1.8.
Claim 32
Dependent Claim
21 words
A filter element according to claim 30 wherein the mod ratio of the fiber is from about 2.0 to about 7.0.
Claim 33
Dependent Claim
21 words
A filter element according to claim 31 wherein the mod ratio of the fiber is from about 2.2 to about 5.
Claim 34
Dependent Claim
11 words
A filter element of claim 1 which is an air filter.
Claim 35
Dependent Claim
9 words
A filter element containing the fibers of claim 1.
References Cited (Backward Citations)
US3359344A
Cited
US3534120A
Cited
US3900549A
Cited
US4609710A
Cited
US4552603A
Cited
US4784892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |