US4758472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High tenacity polyhexamethylene adipamide fiber
Assignee: Asahi Kasei Corp
•
Filing: 1987-09-15
•
Granted: 1988-07-19
•
Expires: 2007-09-15
Abstract
Abstract A high tenacity polyhexamethylene adipamide fiber having: (1) a formic acid relative viscosity of 70 or more than 70; (2) a tenacity of at least 10 g/d; and (3) a coefficient of stability of tie molecule of at most 0.20.
Inventors
- 👤 Kazuyuki Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
A high tenacity polyhexamethylene adipamide fiber having: (a) a formic acid relative viscosity of at least 70; (b) a tenacity of at least 10 g/d; (c) a toughness of at least 200 g/d %; (d) a shrinkage percentage of at most 4% with no load at 160° C. in dry heat for 30 minutes; (e) a coefficient of stability of tie molecule of at most 0.20; and (f) an elongation of at least 19%.
Claim 2
Dependent Claim
74 words
A high tenacity polyhexamethylene adipamide fiber having: (a) a formic acid relative viscosity of at least 70; (b) a tenacity of at least 10 g/d; (c) a toughness of at least 200 g/d %; (d) a shrinkage percentage of at most 4% with no load at 160° C. in dry heat for 30 minutes; (e) a coefficient of stability of tie molecule of at most 0.20; and (f) an elongation of at least 19%.
Claim 3
Dependent Claim
15 words
The fiber of claim 1 wherein the formic acid relative viscosity is 75 to 100.
Claim 4
Dependent Claim
17 words
The fiber of claim 1, wherein the coefficient of stability of tie molecule is at most 0.15.
Claim 5
Dependent Claim
14 words
The fiber according to claim 1, wherein the toughness is at least 125 g/d.%.
Claim 6
Dependent Claim
25 words
The fiber of claim 1, wherein the shrinkage percentage with no load at 160° C. in dry heat for 30 minutes is at most 3%.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |