Patent US3744534A successfully refreshed from Google Patents.
US3744534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective clothing fabric
Assignee: United States Department of the Army
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Filing: 1972-04-12
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Granted: 1973-07-10
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Expires: 1992-04-12
Abstract
Abstract A flame-resistant and toxic chemical-agent protective clothing fabric woven of aromatic polyamide yarns and carbon yarns having at least 12 mg of carbon yarn per square centimeter of fabric, said carbon yarns having a carbon tetrachloride vapor sorption capacity of at least 15 percent by weight.
Inventors
- 👤 M Henry
- 👤 R Macnair
- 👤 R Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:31
CPC Classifications
D; D03; D03D; D03D15/00; D03D15/50; D03D15/513; Y; Y10; Y10S; Y10S57/00; Y10S57/904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
A clothing fabric, according to claim 1, wherein said carbon yarns are uniformly distributed throughout the fabric.
Claim 2
Dependent Claim
24 words
A clothing fabric, according to claim 2, wherein said polyamide yarns of said fabric are woven in the fill and in the warp directions.
Claim 3
Dependent Claim
27 words
A clothing fabric, according to claim 3, wherein the air permeability of said fabric is at least 50 cubic feet per minute per square foot of fabric.
Claim 4
Dependent Claim
26 words
A clothing fabric, according to claim 4, wherein the strength of said fabric in the warp and fill directions have at least 90 lbs per inch.
Claim 5
Dependent Claim
42 words
A clothing fabric, according to claim 5, wherein the warp of said fabric consists of a 3 ply (200 denier) aromatic polyamide yarn and the fill is a combination of a 2 ply (200 denier) aromatic polyamide yarn and the carbon yarn.
Claim 6
Dependent Claim
14 words
A clothing fabric, according to claim 6, wherein the weave is a plain weave.
Claim 7
Independent Claim
71 words
A method of protecting a wearer from a toxic chemical gas agent which comprises enclosing said wearer in a clothing garment constructed of a fabric comprising flame resistant aromatic polyamide yarns interwoven with carbon yarns, said carbon yarns having a carbon tetrachloride vapor sorption capacity of at least 15 percent by weight, and the minimum weight of said carbon yarn in said fabric being at least 12 milligrams per square centimeter.
Claim 8
Dependent Claim
16 words
A method according to claim 8 wherein said carbon yarns are woven uniformly throughout said fabric.
Claim 9
Dependent Claim
19 words
A method according to claim 9 wherein said aromatic polyamide yarns are woven in the fill and warp directions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |