US4444710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing void volume of hollow filaments
Assignee: EIDP Inc
•
Filing: 1982-02-19
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Granted: 1984-04-24
•
Expires: 2002-02-19
Abstract
Abstract A process for increasing the percent void of hollow filaments by contacting the filaments with water at a temperature of at least about 92° C. for at least about 3 seconds. It is necessary that the treatment be carried out while the filaments are in an amorphous condition. Preferred filaments are polyesters.
Inventors
- 👤 Elmer E. Most, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
46 words
A process for increasing the percent void of hollow polyester filaments which comprises melt spinning a hollow polyester filament, and while the filament is still substantially amorphous contacting the filament with water at a temperature at least about 92° C. for at least about 3 seconds.
Claim 2
Dependent Claim
46 words
A process for increasing the percent void of hollow polyester filaments which comprises melt spinning a hollow polyester filament, and while the filament is still substantially amorphous contacting the filament with water at a temperature at least about 92° C. for at least about 3 seconds.
Claim 3
Dependent Claim
51 words
The process of claim 1 in which the filament that is contacted with water at a temperature of at least about 92° C., is a freshly formed hollow filament, and said contact with water at a temperature of at least about 92° C. is for between 3 seconds and 75 seconds.
Claim 4
Dependent Claim
16 words
The process of claim 1 in which the filament is subsequently drawn at least about 2X.
Claim 5
Dependent Claim
34 words
The process of claim 1 in which the filament is longitudinally extended without orientation at least about 1.2X while it is in contact with water at a temperature of at least about 92° C.
Claim 6
Dependent Claim
16 words
The process of claim 4 in which the filament is subsequently drawn at least about 2X.
Claim 7
Dependent Claim
12 words
The process of claim 5 in which the filament is polyethylene terephthalate.
Claim 8
Dependent Claim
18 words
The process of claim 5 in which the filament is a copolymer of polyethylene terephthalate and dimethyl glutarate.
Claim 9
Dependent Claim
22 words
The process of claim 5 in which the filament has a single void located on the centered longitudinal axis of the filament.
Claim 10
Dependent Claim
38 words
The process of claim 5 in which the filament has four voids, one located in each quadrant of the filament when the filament is viewed in cross section at a right angle to the axis of the filament.
Claim 11
Dependent Claim
21 words
The process of claim 8 in which the filament has grooves in the outer surface that extend longitudinally along the filament.
Claim 12
Dependent Claim
22 words
The process of claim 1 in which the polymer is a polymer of ethylene terephthalate, 2% ethylene 5-(sodium-sulfo)isophthalate, and 3%, dimethyl glutarate.
Claim 13
Dependent Claim
62 words
A process for increasing the percent void of hollow polyester filaments which comprises melt spinning a polyester to form a substantially amorphous, substantially unoriented hollow filament thereof, contacting the filament with water at a temperature of at least about 92° C. for at least about 3 seconds while the filament remains substantially amorphous and substantially unoriented whereby the percent void is increased.
Claim 14
Dependent Claim
62 words
A process for increasing the percent void of hollow polyester filaments which comprises melt spinning a polyester to form a substantially amorphous, substantially unoriented hollow filament thereof, contacting the filament with water at a temperature of at least about 92° C. for at least about 3 seconds while the filament remains substantially amorphous and substantially unoriented whereby the percent void is increased.
References Cited (Backward Citations)
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US4290987A
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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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |