US4819458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shrunk fabrics provided from ultra-high tenacity and modulus fibers and methods for producing same
Assignee: Honeywell International Inc
•
Filing: 1982-09-30
•
Granted: 1989-04-11
•
Expires: 2002-09-30
Abstract
Abstract Ultrahigh molecular weight polyethylene fibers of high tenacity and modulus shrink controlled amounts at temperatures in the range of 100 DEG -145 DEG C. Fabrics and twisted multifilament yarns of these fibers are heat-shrunk or heat-set at these temperatures.
Inventors
- 👤 Sheldon Kavesh
- 👤 Dusan C. Prevorsek
- 👤 Gary A. Harpell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:25
CPC Classifications
D; D06; D06C; D06C7/00; D06C7/02; Y; Y10; Y10S; Y10S428/00; Y10S428/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A method for preparing fabrics which comprises the steps: (a) forming a fabric from stretched fibers of tenacity at least about 20 g/denier and tensile modulus at least about 600 g/denier containing polyethylene of weight average molecular weight at least about 500,000, and (b) heating the fabric at a temperature between about 120° C. and about 145° C. sufficient and for a time sufficient for the fibers to shrink between about 1% and about 10% of their length in the fabric formed in step a.
Claim 2
Independent Claim
85 words
A method for preparing fabrics which comprises the steps: (a) forming a fabric from stretched fibers of tenacity at least about 20 g/denier and tensile modulus at least about 600 g/denier containing polyethylene of weight average molecular weight at least about 500,000, and (b) heating the fabric at a temperature between about 120° C. and about 145° C. sufficient and for a time sufficient for the fibers to shrink between about 1% and about 10% of their length in the fabric formed in step a.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said polyethylene is of weight average molecular weight at least 1,000,000.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein said fibers have a tenacity of at least about 30 g/denier and a tensile modulus at least about 1000 g/denier.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein said fibers have a tensile modulus of at least about 1600 g/denier.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein step (b) is performed at a temperature and for a period of time sufficient for the fibers to shrink between about 2% and about 5%.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said forming step (a) includes knitting.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said forming step (a) includes weaving.
Claim 9
Dependent Claim
12 words
The method of claim 1 wherein said fibers are twisted multifilament yarns.
Claim 10
Dependent Claim
49 words
The method of claim 8 wherein the twisted multifilament yarn is heat set at a temperature between 100° C. and 130° C. prior to forming the fabric, and the temperature of said heating step (b) is higher than the temperature at which the twisted multifilament yarn is heat set.
Claim 11
Dependent Claim
10 words
A heat-shrunk fabric produced by the method of claim 1.
References Cited (Backward Citations)
AT173426B
Cited
US3021588A
Cited
US3303169A
Cited
GB1136033A
Cited
US3448573A
Cited
US3748844A
Cited
US4137394A
Cited
US4143197A
Cited
GB2042414A
Cited
US4344908A
Cited
GB2051667A
Cited
US4422993A
Cited
US4430383A
Cited
US4356138A
Cited
US4413110A
Cited
US4436689A
Cited
US4403012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |