Patent US4221835A successfully refreshed from Google Patents.
US4221835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite panels which are not easily combustible
Assignee: Rio Tinto Switzerland AG
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Filing: 1979-01-02
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Granted: 1980-09-09
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Expires: 1999-01-02
Abstract
Abstract An improved lightweight, flame resistant composite panel is disclosed which is readily shaped at room temperature without the necessity of machining. The composite panel comprises a foamed rigid thermoplastic core sandwiched between a pair of metallic layers. The thermoplastic core contains inorganic fillers in powder form to add further flame resistant characteristics to the composite panel. The metallic layers are bonded to the core by means of a thin layer of adhesive which exhibits good strength at elevated temperatures.
Inventors
- 👤 Harald Severus-Laubenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:12
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/046; B32B15/08; B32B27/00; B32B27/18; B32B27/20; B32B7/00; B32B7/04; B32B7/12; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0221; B32B2266/0235; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2307/70; B32B2307/718; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A fire resistant composite panel which is readily formable at room temperature comprising: a foamed rigid themoplastic core having a plurality of fine pores homogeneously disposed therein, said pores containing a non-combustible gas mixture comprising about 55% N 2 , 15% CO 2 , 15% CO and 15% NH 3 ; a metallic cover layer disposed on each side of said core; and adhesive means operable to bond said cover layers to said core, said adhesive means possessing good resistance to shear forces at elevated temperatures.
Claim 2
Dependent Claim
86 words
A fire resistant composite panel which is readily formable at room temperature comprising: a foamed rigid themoplastic core having a plurality of fine pores homogeneously disposed therein, said pores containing a non-combustible gas mixture comprising about 55% N 2 , 15% CO 2 , 15% CO and 15% NH 3 ; a metallic cover layer disposed on each side of said core; and adhesive means operable to bond said cover layers to said core, said adhesive means possessing good resistance to shear forces at elevated temperatures.
Claim 3
Dependent Claim
23 words
A composite panel according to claim 1 wherein said thermoplastic core has a density of from about 0.5 to 1.2 g/cm 2 .
Claim 4
Dependent Claim
40 words
A composite panel according to claim 2 wherein said core thickness is from 1 to 10 mm, said metallic cover layers are from 0.1 to 2.0 mm thick and said adhesive has a thickness of from 10 to 20 microns.
Claim 5
Dependent Claim
76 words
A composite panel according to claim 3, wherein said adhesive means comprises adhesive layers composed of a copolymer of graftpolymer of olefin of 70 to 90 percent by weight ethylene or propylene, 3 to 9 percent by weight of an aliphatic unsaturated C 3 to C 5 carboxylic acid, and 1 to 20 percent by weight of a C 1 to C 8 alkylic ester of an aliphatic unsaturated C 3 to C 5 carboxylic acid.
Claim 6
Dependent Claim
21 words
A composite panel according to claim 3 wherein said adhesive means comprises an adhesive layer composed of vinyl-resin, acrylic-resin and epoxy-resin.
Claim 7
Dependent Claim
15 words
A composite panel according to claim 1 wherein said foamed rigid thermoplastic core is polyvinylchloride.
Claim 8
Dependent Claim
29 words
A composite panel according to claim 1 wherein said foamed rigid thermoplastic core further includes a powdered inorganic composition capable of increasing the fire resistant properties of said core.
Claim 9
Dependent Claim
16 words
A composite panel according to claim 7 wherein said inorganic powder includes metallic oxides and hydroxides.
Claim 10
Dependent Claim
23 words
A composite panel according to claim 7 wherein said inorganic powder comprises a mixture of Sb 2 O 3 and Al(OH) 3 .
Claim 11
Dependent Claim
25 words
A composite panel according to claim 9 wherein the ratio of Sb 2 O 3 to Al(OH) 3 by weight is from 1:3 to 1:5.
Claim 12
Dependent Claim
29 words
A composite panel according to claim 9 wherein the total inorganic powder is in the range of from 7 to 20% by weight of the weight of the core.
Claim 13
Dependent Claim
29 words
A composite panel according to claim 10 wherein the total inorganic powder is in the range of from 7 to 20% by weight of the weight of the core.
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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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |