US4198494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intimate fiber blend of poly(m-phenylene isophthalamide) and poly(p-phenylene terephthalamide)
Assignee: EIDP Inc
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Filing: 1974-09-30
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Granted: 1980-04-15
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Expires: 1994-09-30
Abstract
Abstract This invention relates to fiber blends, yarns and fabrics for use in lightweight garments offering protection against brief exposure to extreme thermal fluxes, the fiber blend comprising a component that fuses within 10 seconds upon exposure to a heat flux of 2 cal./cm. 2 /sec. and a component that in fabric form exhibits a flame strength of at least 20 mg. per denier for at least 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec.
Inventors
- 👤 William G. Burckel, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:12
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/04; D02G3/047; D02G3/44; D02G3/443; D03; D03D; D03D15/00; D03D15/50; D03D15/513; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/4334; D04H1/4342; D04H1/4382; D04H1/43835; D10; D10B; D10B2331/00; D10B2331/02; D10B2331/021; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
An intimate blend of organic staple fiber components comprising at least about 15% by weight of a first fiber component consisting of poly(m-phenylene isophthalamide) fibers which in fabric form will meld or fuse within 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec. and from about 3-20% by weight of a second fiber component consisting of poly(p-phenylene terephthalamide) fibers which in fabric form exhibit a flame strength of at least 20 mg./den. for at least 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec.
Claim 2
Dependent Claim
92 words
An intimate blend of organic staple fiber components comprising at least about 15% by weight of a first fiber component consisting of poly(m-phenylene isophthalamide) fibers which in fabric form will meld or fuse within 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec. and from about 3-20% by weight of a second fiber component consisting of poly(p-phenylene terephthalamide) fibers which in fabric form exhibit a flame strength of at least 20 mg./den. for at least 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec.
Claim 3
Dependent Claim
91 words
An intimate blend of organic staple fiber components comprising at least about 15% by weight of a first fiber component consisting of poly(m-phenylene isophthalamide) fibers which in fabric form will meld or fuse within 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec. and from about 3-20% by weight of a second fiber component consisting of poly(p-benzamide) fibers which in fabric form exhibit a flame strength of at least 20 mg./den. for at least 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec.
Claim 4
Dependent Claim
91 words
An intimate blend of organic staple fiber components comprising at least about 15% by weight of a first fiber component consisting of poly(m-phenylene isophthalamide) fibers which in fabric form will meld or fuse within 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec. and from about 3-20% by weight of a second fiber component consisting of poly(p-benzamide) fibers which in fabric form exhibit a flame strength of at least 20 mg./den. for at least 10 seconds during exposure to a heat flux of 2 cal./cm. 2 /sec.
Claim 5
Dependent Claim
14 words
The fiber blend of claim 1 wherein the poly (m-phenylene isophthalamide) fibers are amorphous.
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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) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |