Patent US4857394A successfully refreshed from Google Patents.
US4857394A
Expired / Lapsed
US
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Flame retardant foams
Assignee: Dow Chemical Co
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Filing: 1988-01-29
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Granted: 1989-08-15
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Expires: 2008-01-29
Abstract
Abstract A flame retardant polymeric foam having a flame retarding amount of heat set carbonaceous fibers derived from stabilized acrylic fibers or pitch based fibers, said fibers having an LOI value greater than 40.
Inventors
- 👤 Francis P. McCullough, Jr.
- 👤 R. Vernon Snelgrove
- 👤 Bhuvenesh C. Goswami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:30
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06; C08J5/04; C08J9/00; C08J9/0085; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249941; Y10T428/249953; Y10T428/249981; Y10T428/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
A flame retardant polymeric foam, said foam having a flame retarding effective amount of heat set carbonaceous polymeric fibers incorporated therein and/or provided on at least one surface of the foam, said fibers having an LOI value greater than 40 a reversible deflection ratio of greater than 1.2:1 and an aspect ratio greater than 10:1.
Claim 2
Dependent Claim
55 words
A flame retardant polymeric foam, said foam having a flame retarding effective amount of heat set carbonaceous polymeric fibers incorporated therein and/or provided on at least one surface of the foam, said fibers having an LOI value greater than 40 a reversible deflection ratio of greater than 1.2:1 and an aspect ratio greater than 10:1.
Claim 3
Dependent Claim
13 words
The foam of claim 1, wherein said carbonaceous fibers comprise a sinusoidal-like configuration.
Claim 4
Dependent Claim
13 words
The foam of claim 1, wherien said carbonaceous fibers comprise a coil-like configuration.
Claim 5
Dependent Claim
17 words
The foam of claim 1, wherein said carbonaceous fibers have a carbon content of less than 85%.
Claim 6
Dependent Claim
17 words
The foam of claim 1, wherein said carbonaceous fibers have a carbon content of at least 85%.
Claim 7
Dependent Claim
14 words
The foam of claim 1, wherein said carbonaceous fibers are derived from acrylic fibers.
Claim 8
Dependent Claim
15 words
The foam of claim 6, wherein said carbonaceous fibers are derived from stabilized polyacrylonitrile fibers.
Claim 9
Dependent Claim
19 words
The foam of claim 1, wherein said carbonaceous fibers have a nitrogen content of from about 16 to 18.8%.
Claim 10
Dependent Claim
21 words
The foam of claim 1, wherein said carbonaceous fibers is non-linear and comprises at least 17% by weight of said foam.
Claim 11
Dependent Claim
12 words
The foam of claim 1, wherein said foam is a polystyrene foam.
Claim 12
Dependent Claim
12 words
The foam of claim 1, wherein said foam is a polyurethane foam.
Claim 13
Dependent Claim
15 words
The foam of claim 1, wherein said carbonaceous fibers are derived from pitch based fibers.
Claim 14
Dependent Claim
21 words
The foam of claim 1, wherein said carbonaceous fibers are non-linear and comprise at least 0.5% by weight of said foam.
Claim 15
Dependent Claim
19 words
The foam of claim 13, wherein said carbonaceous fibers are distributed substantially about the outer surface of said foam.
Claim 16
Dependent Claim
14 words
The foam of claim 1, wherein said carbonaceous fibers are distributed within said foam.
Claim 17
Dependent Claim
17 words
The foam of claim 15 wherein said carbonaceous comprise at least 10% by weight of said foam.
Claim 18
Dependent Claim
25 words
The foam of claim 1, wherein said polymeric foam comprises a foamed resin selected from the group consisting polyurethane, urea, latex, polyolefin, polystyrene and isocyanurate.
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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) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |