Patent US4748065A successfully refreshed from Google Patents.
US4748065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spunlaced nonwoven protective fabric
Assignee: EIDP Inc
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Filing: 1986-08-13
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Granted: 1988-05-31
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Expires: 2006-08-13
Abstract
Abstract A flame resistant and noxious chemical adsorbent, flexible, creped fabric suited for use as a protective garment is disclosed. The fabric is spunlaced and nonwoven and is impregnated with adsorbent carbonized particles.
Inventors
- 👤 Murty S. S. R. Tanikella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:16
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/73; D06M11/74; D06M15/00; D06M15/693; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24446; Y10T428/25; Y10T442/00; Y10T442/20; Y10T442/2508; Y10T442/2631
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A flame resistant and noxious chemical adsorbent, flexible, creped fabric comprising: (a) a spunlaced fabric substrate comprising at least 90% by weight aramid staple fibers having a length between 0.75 and 10 cm, said fabric having a weight in the range of 35 to 70 g/m 2 and a thickness of 300 to 800 μm; (b) said fabric being impregnated with adsorbent carbonized particles having a particle size less than 100 μm, said particles being approximately uniformly distributed over the entire fabric, and dispensed throughout the cross section of the fabric, said particles being present in an amount of 20 to 120 g/m 2 of fabric; (c) said adsorbent particles being held in place in the fabric by a synthetic copolymeric latex organic binder, said binder being present in the amount of 10 to 50% by weight of the adsorbent particles.
Claim 2
Dependent Claim
141 words
A flame resistant and noxious chemical adsorbent, flexible, creped fabric comprising: (a) a spunlaced fabric substrate comprising at least 90% by weight aramid staple fibers having a length between 0.75 and 10 cm, said fabric having a weight in the range of 35 to 70 g/m 2 and a thickness of 300 to 800 μm; (b) said fabric being impregnated with adsorbent carbonized particles having a particle size less than 100 μm, said particles being approximately uniformly distributed over the entire fabric, and dispensed throughout the cross section of the fabric, said particles being present in an amount of 20 to 120 g/m 2 of fabric; (c) said adsorbent particles being held in place in the fabric by a synthetic copolymeric latex organic binder, said binder being present in the amount of 10 to 50% by weight of the adsorbent particles.
Claim 3
Dependent Claim
31 words
The fabric of claim 1 in which the aramid fibers are selected from the group consisting of (a) polymetaphenylene isophthalamide fibers, (b) polyparaphenylene terephthalamide fibers, and blend of (a) and (b).
Claim 4
Dependent Claim
21 words
The fabric of claim 2 in which the adsorbent carbonized particles are sulfonated styrene/polydivinyl benzene copolymer particles that have been carbonized.
Claim 5
Dependent Claim
22 words
The fabric of claim 3 in which the binder is present in the amount of 10-20% by weight of the adsorbent particles.
Claim 6
Dependent Claim
19 words
The fabric of claim 4, in which the staple fibers have a linear density of 1 to 6 decitex.
Claim 7
Dependent Claim
18 words
The fabric of claim 5 in which the adsorbent carbonized particles have a particle size of 4-50 μm.
References Cited (Backward Citations)
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |