USH47H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel with aramid honeycomb core
Assignee: EIDP Inc
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Filing: 1985-05-15
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Granted: 1986-04-01
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Expires: 2005-05-15
Abstract
Abstract A lightweight structural panel having an aramid honeycomb core faced with a resin-impregnated fiber layer is provided with increased peel strength between the core surface and facing layer by interposing a spunlaced fabric containing at least 50 weight percent aramid fibers and being pervaded with the resin between the core and the facing. Phenolic resins and woven facing fabrics of poly(p-phenylene terephthalamide) yarns are preferred.
Inventors
- 👤 Mohamed M. Monib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:43
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; B32B27/00; B32B27/12; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; B32B2250/00; B32B2250/40; B32B2607/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
In a lightweight structural panel having an aramid honeycomb core faced with a resin-impregnated fiber layer, the improvement comprising, for increased peel strength between the core surface and facing layer, a spunlaced fabric composed of at least 50% by weight of aramid fibers, said spunlaced fabric being pervaded by the resin, being located between the facing layer and the core surface and providing a strong bond between the core and the facing.
Claim 2
Dependent Claim
72 words
In a lightweight structural panel having an aramid honeycomb core faced with a resin-impregnated fiber layer, the improvement comprising, for increased peel strength between the core surface and facing layer, a spunlaced fabric composed of at least 50% by weight of aramid fibers, said spunlaced fabric being pervaded by the resin, being located between the facing layer and the core surface and providing a strong bond between the core and the facing.
Claim 3
Dependent Claim
21 words
A panel in accordance with claim 1 wherein the aramid fibers of the spunlaced fabric are of poly (m-phenylene isophthalamide) polymer.
Claim 4
Dependent Claim
25 words
A panel in accordance with claim 1 wherein the spunlaced fabric has a unit weight in the range of 15 to 30 g/m 2 .
Claim 5
Dependent Claim
43 words
A panel in accordance with claim 1, 2 or 3 wherein the panel is a sandwich structure in which the honeycomb core has a second surface bonded to a spunlaced fabric and a facing layer in the same manner as the other surface.
Claim 6
Dependent Claim
30 words
A panel in accordance with claims 1, 2 or 3 wherein the resin is a phenolic resin and the facing layer is a resin-impregnated woven fabric of poly(p-phenylene terephthalamide) yarn.
Claim 7
Dependent Claim
82 words
A process for preparing an improved lightweight structural panel comprising forming an assembly of an aramid honeycomb core, a spunlaced fabric which includes at least 50% by weight of aramid fibers, and a resin-impregnated fiber facing layer, by interposing the spunlaced fabric between and adjacent to a surface of the honeycomb core and a surface of the facing layer, heating the assembly to cause resin from the facing to prevade the interposed spunlaced fabric and curing the resin to bond the assembly.
Claim 8
Dependent Claim
82 words
A process for preparing an improved lightweight structural panel comprising forming an assembly of an aramid honeycomb core, a spunlaced fabric which includes at least 50% by weight of aramid fibers, and a resin-impregnated fiber facing layer, by interposing the spunlaced fabric between and adjacent to a surface of the honeycomb core and a surface of the facing layer, heating the assembly to cause resin from the facing to prevade the interposed spunlaced fabric and curing the resin to bond the assembly.
Claim 9
Dependent Claim
20 words
A process in accordance with claim 6 wherein the aramid fiabers of the spunlaced fabric are of poly(m-phenylene isophthalamide) polymer.
Claim 10
Dependent Claim
27 words
A process in accordance with claim 6 or 7 wherein the spunlaced fabric has a unit weight in the range of 15 to 30 g/m 2 .
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |