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US3801422A
Expired / Lapsed
US
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Multilayer fibrous insulating article
Assignee: Akzona Inc
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Filing: 1971-03-01
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Granted: 1974-04-02
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Expires: 1991-03-01
Abstract
Abstract A multilayer web or article of insulating material which essentially includes at least one flame-resistant layer having polyacyloxalamidrazone fibers bearing at least one metal, preferably zinc, tin or calcium, in chemically combined form. These articles or materials are especially suitable in the manufacture of rescue suits, protective clothing and protective linings.
Inventors
- 👤 H Gorlach
- 👤 W Stroot
- 👤 A Kreckl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:56
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/07; D06M11/11; D06M11/155; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B5/02; B32B5/024; B32B5/026; B32B5/06; D06M11/20; D06M11/22; D06M17/00; B32B2255/00; B32B2255/20; B32B2255/205; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2307/00; B32B2307/30; B32B2307/304; B32B2307/306; B32B2307/3065; B32B2307/70; B32B2307/718; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23914; Y10T428/31504; Y10T428/31678; Y10T428/31725; Y10T428/31765; Y10T442/00; Y10T442/60; Y10T442/654; Y10T442/655; Y10T442/696
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
40 words
An insulating article as claimed in claim 1 wherein said flame-resistant layer consists essentially of a fibrous material which is a mixture of (A) cellulose and (B) said polyacyloxalamidrazone in complex chemical combination with at least one of said metals.
Claim 2
Dependent Claim
25 words
An insulating article as claimed in claim 2 wherein the proportion of the polyacylamidrazone in said mixture is at least about 20 percent by weight.
Claim 3
Dependent Claim
36 words
An insulating article as claimed in claim 2 wherein the proportion of the polyacylamidrazone in said mixture is about 30 to 70 percent by weight, the proportion of cellulose being 70 to 30 percent by weight.
Claim 4
Dependent Claim
36 words
An insulating article as claimed in claim 2 wherein the proportion of the polyacylamidrazone in said mixture is about 40 to 50 percent by weight, the proportion of cellulose being 60 to 50 percent by weight.
Claim 5
Dependent Claim
30 words
An insulating article as claimed in claim 1 wherein the amount of metal in complex chemical combination is at least about 15 percent by weight with reference to the polyacyloxalamidrazone.
Claim 6
Dependent Claim
24 words
An insulating article as claimed in claim 6 wherein said metal is a member selected from the group consisting of zinc, tin and calcium.
Claim 7
Dependent Claim
14 words
An insulating article as claimed in claim 6 wherein the polyacyloxalamidrazone is polyterephthaloyl oxalamidrazone.
Claim 8
Dependent Claim
14 words
An insulating article as claimed in claim 7 wherein the polyacyloxalamidrazone is polyterephthaloyl oxalamidrazone.
Claim 9
Dependent Claim
42 words
An insulating article as claimed in claim 1 wherein the flame-resistant layer includes 50 to 100 percent by weight of said polyacyloxalamidrazone combined with said metal and the total weight of said layer is about 50 to 300 grams per square meter.
Claim 10
Dependent Claim
28 words
An insulating article as claimed in claim 10 wherein the total weight of all fibrous layers of the article is about 300 to 1,000 grams per square meter.
Claim 11
Dependent Claim
34 words
An insulating article as claimed in claim 1 wherein at least one outer layer of fibrous insulating material is a woven or knitted fabric formed of yarn containing said polyacyloxalamidrazone combined with said metal.
Claim 12
Dependent Claim
32 words
An insulating article as claimed in claim 1 wherein at least one inner layer of fibrous insulating material is a voluminous fleece formed of fibers containing said polyacyloxalamidrazone combined with said metal.
Claim 13
Dependent Claim
19 words
An insulating article as claimed in claim 1 wherein an outer surface layer of the fibrous material is metallized.
Claim 14
Dependent Claim
27 words
An insulating article as claimed in claim 1 which contains in addition to said flame-resistant layer at least one heat-insulating layer composed of a fibrous polyester fleece.
Claim 15
Dependent Claim
28 words
An insulating article as claimed in claim 1 wherein the total weight of all fibrous layers in said article is about 300 to 1,000 grams per squaRe meter.
Claim 16
Dependent Claim
62 words
An insulating article as claimed in claim 2 wherein said fibrous material of the flame-resistant layer is formed by spinning in common a mixture of fiber-forming cellulose and polyacyloxalamidrazone as an aqueous alkaline solution thereof into an acid precipitation bath, withdrawing the precipitated filaments therefrom and reacting the filaments with an aqueous solution of at least one water-soluble compound of said metal.
Claim 17
Dependent Claim
22 words
An insulating article as claimed in claim 17 wherein said metal is selected from the group consisting of zinc, tin and calcium.
Claim 18
Dependent Claim
34 words
An insulating article as claimed in claim 17 wherein said fibrous material is composed of about 30 to 70 percent by weight of said polyacyloxalamidrazone and 70 to 30 percent by weight of cellulose.
Claim 19
Dependent Claim
27 words
An insulating article as claimed in claim 19 wherein said fibrous material contains at least 15 percent by weight of said metal with reference to the polyacyloxalamidrazone.
Claim 20
Dependent Claim
14 words
An insulating article as claimed in claim 20 wherein said polyacyloxalamidrazone is polyterephthaloyl oxalamidrazone.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |