US4250220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite panel with two outer layers and a central core
Assignee: Rio Tinto Switzerland AG
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Filing: 1979-08-13
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Granted: 1981-02-10
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Expires: 1999-08-13
Abstract
Abstract The present invention concerns a composite panel with two cover sheets and between these a core made from a mixture of a granular filler material and a binding agent. The resultant panel meets the requirements governing incombustible building components in various countries, and can therefore be put in the class of incombustible building components. The core material used in known composite panels can be inorganic and incombustible, but all such composite panels known to date suffer from severe disadvantages. To avoid these disadvantages 100 parts by weight of the core material of the panel contains: 85-95 wt % of granular filler material which has an average particle size of over 100 μm and at least 50 wt % Al(OH) 3 and 5-15 wt % of a binding agent.
Inventors
- 👤 Reinhard Schlatter
- 👤 Arnold Grass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:10
CPC Classifications
B; B32; B32B; B32B19/00; B32B19/04; B32B19/045; B32B7/00; B32B7/04; B32B7/12; C; C04; C04B; C04B14/00; C04B14/02; C04B14/30; C04B14/303; C04B26/00; C04B26/02; B32B2250/00; B32B2250/03; B32B2250/40; B32B2264/00; B32B2264/10; B32B2264/107; B32B2305/00; B32B2305/30; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2307/50; B32B2307/51; B32B2307/558; B32B2315/00; B32B2315/12; B32B2607/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
Composite panel with two cover sheets and a core therebetween and bonded thereto, wherein the core comprises a mixture of granular filler material and an organic binding agent, in which 100 parts by weight of core material is made up of 5-15 weight percent binding agent and 85-95 weight percent granular filler material which has an average grain diameter of more than 100 microns and contains at least 50 weight percent Al(OH) 3 , wherein the amount of binding agent decreases from the cover sheet towards the center of the core, wherein said panel is incombustible and is characterized by good strength and elasticity and good adhesion between the cover sheets and the core.
Claim 2
Dependent Claim
114 words
Composite panel with two cover sheets and a core therebetween and bonded thereto, wherein the core comprises a mixture of granular filler material and an organic binding agent, in which 100 parts by weight of core material is made up of 5-15 weight percent binding agent and 85-95 weight percent granular filler material which has an average grain diameter of more than 100 microns and contains at least 50 weight percent Al(OH) 3 , wherein the amount of binding agent decreases from the cover sheet towards the center of the core, wherein said panel is incombustible and is characterized by good strength and elasticity and good adhesion between the cover sheets and the core.
Claim 3
Dependent Claim
57 words
Composite panel according to claim 1 in which a part of the total amount of binding agent is applied to the inside faces of the cover sheets to improve adhesion and the strength of the composite, as a result of which the amount of binding agent decreases from the cover sheet towards the center of the core.
Claim 4
Dependent Claim
13 words
Composite panel according to claim 1 in which the core material contains fibers.
Claim 5
Dependent Claim
30 words
Composite panel according to claim 1 in which the binding agent is an organic reaction mixture hardened during the manufacture of the panel by a polymerization reaction of fluid components.
Claim 6
Dependent Claim
15 words
Composite panel according to claim 1 having a thickness of from 2 to 10 mm.
Claim 7
Dependent Claim
24 words
Composite panel according to claim 4 wherein said polymerization reaction forms a polymer selected from the group consisting of polyester, polyurethane, epoxy and polymethyl-methacrylate.
Claim 8
Dependent Claim
25 words
Composite panel according to claim 2 wherein 5-40% of the total amount of binding agent is applied to the inside faces of the cover sheets.
References Cited (Backward Citations)
US3137612A
Cited
US3549474A
Cited
US3703385A
Cited
US3827997A
Cited
FR2165307A5
Cited
JPS5022586A
Cited
US4032393A
Cited
US4076580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |