US4120914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyamide fiber blend for protective clothing
Assignee: EIDP Inc
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Filing: 1977-02-04
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Granted: 1978-10-17
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Expires: 1997-02-04
Abstract
Abstract An intimate blend of aromatic polyamide staple fiber components comprising 45-55 weight percent poly(m-phenylene isophthalamide) fibers and 45-55 weight percent poly(p-phenylene terephthalamide) fibers whose stress-strain curve exhibits no yield point.
Inventors
- 👤 Wallace Peery Behnke
- 👤 Robert Stuart Chapin
- 👤 John Francis Fierro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/04; D02G3/047; C; C08; C08L; C08L77/00; C08L77/10; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
30 words
An intimate blend of aromatic polyamide staple fiber components comprising 45-55 weight percent poly(m-phenylene isophthalamide) fibers and 45-55 weight percent poly(p-phenylene terephthalamide) fibers whose stress-strain curve exhibits no yield point.
Claim 2
Dependent Claim
30 words
An intimate blend of aromatic polyamide staple fiber components comprising 45-55 weight percent poly(m-phenylene isophthalamide) fibers and 45-55 weight percent poly(p-phenylene terephthalamide) fibers whose stress-strain curve exhibits no yield point.
Claim 3
Dependent Claim
12 words
The blend of claim 1 wherein the poly(m-phenylene isophthalamide) fibers are amorphous.
Claim 4
Dependent Claim
31 words
The blend of claim 1 wherein at least one of the component fibers contains an amount of phosphorus-containing flame retardant to provide at least 0.8% by weight phosphorus in the blend.
Claim 5
Dependent Claim
14 words
The blend of claim 1 wherein the poly(m-phenylene isophthalamide) fibers contain phosphorus-containing flame retardant.
Claim 6
Dependent Claim
11 words
The blend of claim 1 wherein the component fibers are dyed.
References Cited (Backward Citations)
US3817941A
Cited
USB378760I5
Cited
US3869429A
Cited
US3869430A
Cited
GB1438067A
Cited
FR2286218A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |