Patent US3838561A successfully refreshed from Google Patents.
US3838561A
Expired / Lapsed
US
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Unique polyethylene terephthalate fiber and yarn
Assignee: Akzona Inc
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Filing: 1971-10-07
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Granted: 1974-10-01
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Expires: 1991-10-07
Abstract
Abstract A fiber especially suitable for reinforcing bitumen-containing materials which comprises a fiber of polyethylene terephthalate having a tenacity of at least about 7.5 grams per denier, an elongation at break of at least about 9 percent, an elongation of not more than about 5 percent under a load of 5 grams per denier and a shrinkage of less than 4 percent when kept under a tension of 0.05 grams per denier for 4 minutes at about 160*C. Also a process for producing this fiber and a bitumen-containing structure reinforced therewith are disclosed.
Inventors
- 👤 J Munting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:40
CPC Classifications
D; D06; D06N; D06N5/00; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D02; D02G; D02G3/00; D02G3/02; D02G3/22; D02G3/44; D02G3/447; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A REINFORCING FIBER WHICH COMPRISES A FIBER OF POLYETHYLENE TEREPHTHALATE HAVING A TENACITY OF AT LEAST ABOUT 7.5 GRAMS PER DENIER, AN ELONGATION AT BREAK OF AT LEAST ABOUT 9 PERCENT, AN ELONGATION OF NOT MORE THAN ABOUT 5 PERCENT UNDER A LOAD OF 5 GRAMS PER DENIER AND A SHRINKAGE OF LESS THAN 4 PERCENT WHEN KEPT UNDER A TENSION OF 0.05 GRAMS PER DENIER FOR 4 MINUTES AT ABOUT 160*C.
Claim 2
Dependent Claim
72 words
A REINFORCING FIBER WHICH COMPRISES A FIBER OF POLYETHYLENE TEREPHTHALATE HAVING A TENACITY OF AT LEAST ABOUT 7.5 GRAMS PER DENIER, AN ELONGATION AT BREAK OF AT LEAST ABOUT 9 PERCENT, AN ELONGATION OF NOT MORE THAN ABOUT 5 PERCENT UNDER A LOAD OF 5 GRAMS PER DENIER AND A SHRINKAGE OF LESS THAN 4 PERCENT WHEN KEPT UNDER A TENSION OF 0.05 GRAMS PER DENIER FOR 4 MINUTES AT ABOUT 160*C.
Claim 3
Dependent Claim
72 words
The reinforcing fiber of claim 1 in which said fiber has a tenacity at a range of about 7.5 to 9.5 grams per denier, an elongation at break of from about 9 to 15 percent, an elongation of about 2 to 5 percent at a load of 5 grams per denier and a shrinkage of from about 1 to 4 percent when being heated for 4 minutes at 160*C. under said tension.
Claim 4
Dependent Claim
30 words
The reinforcing fiber of claim 1 in which the polyethylene terephthalate from which the fiber is made has a relative viscosity in the range of from about 1.50 to 1.70.
Claim 5
Dependent Claim
12 words
A yarn made up of a plurality of continuous fibers of claim
Claim 6
Dependent Claim
8 words
A fabric containing the yarn of claim 4.
Claim 7
Dependent Claim
40 words
The reinforcing fiber of claim 1 in which the tenacity and elongation of said fiber are determined at a temperature of 20*C., a relative humidity of 65 percent and at a constant rate of extension of 30 centimeters per minute.
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |