US4833029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Honeycomb facesheet material and honeycomb made therewith
Assignee: Raytheon Co
•
Filing: 1986-12-19
•
Granted: 1989-05-23
•
Expires: 2006-12-19
Abstract
Abstract A honeycomb facesheet material, and honeycomb made therewith, wherein the facesheet includes a layer of graphite paper bonded to a layer of graphite cloth, woven from widely spaced graphite fibers. The facesheet is impregnated with an epoxy resin during manufacture, and the facesheet is bonded to an open end of the honeycomb under elevated pressure and temperature to effect curing of the epoxy resin. The graphite paper supports the layer of graphite cloth during handling to prevent misalignment of the fibers, and also effects a widely distributed bond between the fibers and the underlying honeycomb.
Inventors
- 👤 Preston S. DuPont
- 👤 Robert E. Ritter
- 👤 Brian A. McGrath
- 👤 Brent G. Schaffer
- 👤 Kenneth A. Fouts, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:52
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; B32B29/00; B32B29/02; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/028; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/106; B32B2305/00; B32B2305/02; B32B2305/024; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
52 words
A honeycomb facesheet material, comprising: a woven graphite cloth having interwoven graphite fibers of an average spacing between fibers of at least the diameter of the fibers; and a piece of graphite paper adhered to said layer of graphite cloth, said cloth and said grpahite paper being impregnated with a curable adhesive.
Claim 2
Dependent Claim
52 words
A honeycomb facesheet material, comprising: a woven graphite cloth having interwoven graphite fibers of an average spacing between fibers of at least the diameter of the fibers; and a piece of graphite paper adhered to said layer of graphite cloth, said cloth and said grpahite paper being impregnated with a curable adhesive.
Claim 3
Dependent Claim
26 words
The facesheet material of claim 1, wherein said fibers have a modulus of elasticity of from about 70 to about 80 million pounds per square inch.
Claim 4
Dependent Claim
18 words
The facesheet material of claim 1, wherein each of said fibers comprises a plurality of filaments of graphite.
Claim 5
Dependent Claim
26 words
The facesheet material of claim 1, wherein the diameter of said fibers is about 0.020 inches and the spacing between said fibers is about 0.080 inches.
Claim 6
Dependent Claim
24 words
The facesheet material of claim 1, wherein the weight of said graphite paper is from about 0.2 to about 2.0 ounces per square yard.
Claim 7
Dependent Claim
20 words
The facesheet material of claim 1, wherein the weight of said graphite paper is about 0.3 ounces per square yard.
Claim 8
Dependent Claim
28 words
The facesheet material of claim 1, wherein said curable adhesive is selected from the group consisting of an epoxy resin adhesive, a polyimide adhesive, and a polysulfone adhesive.
Claim 9
Dependent Claim
80 words
A honeycomb facesheet material, comprising: a layer of woven graphite fibers having about 10 fibers per inch in each direction perpendicular to the fibers in the plane of the cloth, the modulus of elasticity of said fibers being from about 70 to about 80 million pounds per square inch; a layer of graphite paper having a weight of about 0.3 ounces per square yard adhered to said layer of fibers, said fibers and said cloth being impregnated with epoxy resin.
Claim 10
Dependent Claim
80 words
A honeycomb facesheet material, comprising: a layer of woven graphite fibers having about 10 fibers per inch in each direction perpendicular to the fibers in the plane of the cloth, the modulus of elasticity of said fibers being from about 70 to about 80 million pounds per square inch; a layer of graphite paper having a weight of about 0.3 ounces per square yard adhered to said layer of fibers, said fibers and said cloth being impregnated with epoxy resin.
Claim 11
Dependent Claim
54 words
A stiffened honeycomb material, comprising: a piece of metallic honeycomb material; a piece of graphite paper bonded to one face of said honeycomb; and a woven graphite cloth having woven graphite fibers of an average spacing between fibers of at least the diameter of the fibers, said cloth being bonded to said graphite paper.
Claim 12
Dependent Claim
54 words
A stiffened honeycomb material, comprising: a piece of metallic honeycomb material; a piece of graphite paper bonded to one face of said honeycomb; and a woven graphite cloth having woven graphite fibers of an average spacing between fibers of at least the diameter of the fibers, said cloth being bonded to said graphite paper.
Claim 13
Dependent Claim
23 words
The stiffened honeycomb material of claim 9, wherein said fibers have a modulus of elasticity of about 70 million pounds per square inch.
Claim 14
Dependent Claim
19 words
The stiffened honeycomb material of claim 9, wherein each of said fibers comprises a plurality of filaments of graphite.
Claim 15
Dependent Claim
16 words
The stiffened honeycomb material of claim 9, wherein the spacing between fibers is about 0.080 inches.
Claim 16
Dependent Claim
25 words
The stiffened honeycomb material of claim 9, wherein the weight of the graphite paper is from about 0.2 to about 2.0 ounces per square yard.
Claim 17
Dependent Claim
21 words
The stiffened honeycomb material of claim 9, wherein the weight of the graphite paper is about 0.3 ounces per square yard.
Claim 18
Dependent Claim
28 words
The stiffened honeycomb material of claim 9, wherein a plurality of pieces of graphite paper and a plurality of graphite cloths are bonded to a single honeycomb material.
Claim 19
Dependent Claim
39 words
The stiffened honeycomb material of claim 15, wherein a piece of graphite paper is bonded to each face of said honeycomb, and a piece of graphite cloth is bonded to the exposed face of each piece of graphite paper.
References Cited (Backward Citations)
US30600A
Cited
US2477852A
Cited
GB1311202A
Cited
US3691000A
Cited
US3864169A
Cited
US3973991A
Cited
US3916054A
Cited
US4022481A
Cited
USRE30600E
Cited
US4080413A
Cited
US4064207A
Cited
US4061812A
Cited
US4189531A
Cited
US4284457A
Cited
US4263367A
Cited
US4384020A
Cited
US4447130A
Cited
US4435455A
Cited
US4680069A
Cited
EP0136096A2
Cited
US4680216A
Cited
US4671841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |