US4615933A
Expired / Lapsed
US
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Radome structure and method of manufacture thereof
Assignee: Rogers Corp
•
Filing: 1984-04-06
•
Granted: 1986-10-07
•
Expires: 2004-04-06
Abstract
Abstract A radome combines low dielectric constant and dissipation factor at microwave frequencies with mechanical strength and rigidity as well as resistance to ablation and rain erosion at hypersonic velocities in the range of Mach 4 to 6. Continuous filament glass fabric and/or strand is saturated with PTFE dispersion. Layers are applied to a mandrel and cold isostatically pressed. The pressed layer may be machined between applications and subsequent pressings. After all layers are applied and pressed, optionally including an outer ablation resistant random fiber reinforced PTFE composite, the densified structure is heat cycled above the crystalline melt point of the polymer to maximize mechanical properties.
Inventors
- 👤 G. Robert Traut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:53
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/342; C; C23; C23C; C23C24/00; C23C24/08; H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/422; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992
Claims Analysis
Total Claims: 86
Claim 1
Independent Claim
169 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of a plurality of layers of the dried fiber material on a forming surface; (d) isostatically pressing the plurality of layers to form a rigid and densified composite of the layers; (e) machining said composite to a desired shape; (f) applying at least one more layer of saturated fiber material to said composite; (g) isostatically pressing to coalesce the polymer particles of said layer to said machined preform. (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 2
Independent Claim
169 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of a plurality of layers of the dried fiber material on a forming surface; (d) isostatically pressing the plurality of layers to form a rigid and densified composite of the layers; (e) machining said composite to a desired shape; (f) applying at least one more layer of saturated fiber material to said composite; (g) isostatically pressing to coalesce the polymer particles of said layer to said machined preform. (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein: said steps of (c),(d) and (e) are repeated.
Claim 4
Dependent Claim
26 words
The method of claim 1 including the step of: including a layer of fluorocarbon polymer material between layers of dried fiber material having interspersed polymer particles.
Claim 5
Independent Claim
24 words
The method according to claims 1, 2 or 3 wherein: said fiber material is fabric material woven from said strands of inorganic fiber material.
Claim 6
Dependent Claim
49 words
The method of claim 1 wherein said steps of forming a structural preform includes: forming a first layer of stranded fiber material in a first direction on said forming surface; and forming a second layer of stranded fiber material in a second direction on said first layer of strands.
Claim 7
Dependent Claim
32 words
The method according to claim 5 wherein said step of applying at least one more layer of stranded fiber material includes: forming a third layer of stranded fiber material to said composite.
Claim 8
Dependent Claim
34 words
The method according to claim 5 wherein: said first layer of stranded fiber material is wound circumferentially about a mandrel; and said second layer of stranded fiber material is wound longitudinally about a mandrel.
Claim 9
Dependent Claim
32 words
The method of claim 7 wherein said step of applying at least one more layer of saturated fiber material includes: forming a third layer of stranded fiber material circumferentially about the mandrel.
Claim 10
Dependent Claim
40 words
The method according to claim 1 wherein: isostatic pressing is accomplished at a pressure range of from about 5,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 200° C.
Claim 11
Dependent Claim
40 words
The method according to claim 1 wherein: isostatic pressing is accomplished at a pressure range of from about 30,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 40° C.
Claim 12
Dependent Claim
19 words
The method according to claim 1 including: machining the assembly as necessary to form a body of desired shape.
Claim 13
Independent Claim
138 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) applying to said preform a powdered composite layer of fibers and fluorocarbon polymer; (e) isostatically pressing said powdered composite layer over said preform; (f) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (g) cooling said assembly.
Claim 14
Independent Claim
138 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) applying to said preform a powdered composite layer of fibers and fluorocarbon polymer; (e) isostatically pressing said powdered composite layer over said preform; (f) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (g) cooling said assembly.
Claim 15
Dependent Claim
32 words
The method of claim 12 including the steps of: machining said preform as necessary to form a desired shape; and machining said assembly as necessary to form a body of desired shape.
Claim 16
Independent Claim
50 words
The method of claims 12 or 13 wherein said step of forming a structural preform includes: forming a structural preform of a plurality of layers of dried fiber material on a forming surface; and isostatically pressing the plurality of layers to form a rigid and densified composite of the layers.
Claim 17
Dependent Claim
37 words
The method of claim 14 wherein: the step of forming a structural preform of a plurality of layers of dried fiber material and the step of isostatically pressing are repeated for successive layers of dried fiber material.
Claim 18
Dependent Claim
23 words
The method according to claim 12 or 13 wherein: said fiber material is fabric material woven from said strands of inorganic fiber material.
Claim 19
Dependent Claim
49 words
The method of claim 12 wherein said steps of forming a structural preform includes: forming a first layer of stranded fiber material in a first direction on said forming surface; and forming a second layer of stranded fiber material in a second direction on said first layer of strands.
Claim 20
Dependent Claim
18 words
The method according to claim 17 including: applying a third layer of stranded fiber material to said composite.
Claim 21
Dependent Claim
34 words
The method according to claim 17 wherein: said first layer of stranded fiber material is wound circumferentially about a mandrel; and said second layer of stranded fiber material is wound longitudinally about a mandrel.
Claim 22
Dependent Claim
19 words
The method according to claim 19 including: applying a third layer of stranded fiber material circumferentially about the mandrel.
Claim 23
Dependent Claim
40 words
The method according to claim 12 wherein: isostatic pressing is accomplished at a pressure range of from about 5,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 200° C.
Claim 24
Dependent Claim
40 words
The method according to claim 12 wherein: isostatic pressing is accomplished at a pressure range of from about 30,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 40° C.
Claim 25
Independent Claim
144 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) forming segments of fiber reinforced fluoropolymer material of a complex shape; (e) stacking said segments in a mold; (f) placing said structural preform in said mold within said segments; (g) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (h) cooling said assembly.
Claim 26
Independent Claim
144 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) forming segments of fiber reinforced fluoropolymer material of a complex shape; (e) stacking said segments in a mold; (f) placing said structural preform in said mold within said segments; (g) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (h) cooling said assembly.
Claim 27
Dependent Claim
32 words
The method of claim 23 including the steps of: machining said preform as necessary to form a desired shape; and machining said assembly as necessary to form a body of desired shape.
Claim 28
Independent Claim
50 words
The method of claims 23 or 24 wherein said step of forming a structural preform includes: forming a structural preform of a plurality of layers of dried fiber material on a forming surface; and isostatically pressing the plurality of layers to form a rigid and densified composite of the layers.
Claim 29
Dependent Claim
37 words
The method of claim 25 wherein: the step of forming a structural preform of a plurality of layers of dried fiber material and the step of isostatically pressing are repeated for success layers of dried fiber material.
Claim 30
Dependent Claim
23 words
The method according to claim 23 or 24 wherein: said fiber material is fabric material woven from said strands of inorganic fiber material.
Claim 31
Dependent Claim
49 words
The method of claim 23 wherein said steps of forming a structural preform includes: forming a first layer of stranded fiber material in a first direction on said forming surface; and forming a second layer of stranded fiber material in a second direction on said first layer of strands.
Claim 32
Dependent Claim
18 words
The method according to claim 28 including: applying a third layer of stranded fiber material to said composite.
Claim 33
Dependent Claim
34 words
The method according to claim 20 wherein: said first layer of stranded fiber material is wound circumferentially about a mandrel; and said second layer of stranded fiber material is wound longitudinally about a mandrel.
Claim 34
Dependent Claim
19 words
The method according to claim 30 including: applying a third layer of stranded fiber material circumferentially about the mandrel.
Claim 35
Dependent Claim
40 words
The method according to claim 23 wherein: isostatic pressing is accomplished at a pressure range of from about 5,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 200° C.
Claim 36
Dependent Claim
41 words
The method according to claim 23 wherein: isostatic pressing is accomplished at a pressure range of from about 30,000 psi to about 100 000 psi and at a temperature in the range of from about 20° C. to about 40° C.
Claim 37
Independent Claim
211 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a first layer of the dried fiber material in strand form on a forming surface, with the strand material generally oriented in a first direction; (d) placing over said strand layer a second layer of segments of the dried fiber material in woven form, said woven material having a high strand weight ratio in a second direction; (e) isostatically pressing said first and second layers to form a rigid and densified composite of said layers; (f) applying a third layer of the dried fiber material in strand form over said composite in the direction of said first layer; (g) isostatically pressing to coalesce the polymer particles of said third layer of said composite; (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 38
Independent Claim
211 words
A method for the production of bodies of complex shape, including the steps of: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a first layer of the dried fiber material in strand form on a forming surface, with the strand material generally oriented in a first direction; (d) placing over said strand layer a second layer of segments of the dried fiber material in woven form, said woven material having a high strand weight ratio in a second direction; (e) isostatically pressing said first and second layers to form a rigid and densified composite of said layers; (f) applying a third layer of the dried fiber material in strand form over said composite in the direction of said first layer; (g) isostatically pressing to coalesce the polymer particles of said third layer of said composite; (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 39
Dependent Claim
25 words
The method of claim 34 wherein: said segments of material in woven form are arranged in edge abutting relationship to entirely cover said first layer.
Claim 40
Independent Claim
54 words
The method of claims 34 or 35 wherein: said first layer of strand material is wound circumferentially about a mandrel; and said second layer of woven material has a majority of fibers in a direction longitudinal with respect to the mandrel; and said third layer of strand material is wound circumferentially about the mandrel.
Claim 41
Dependent Claim
166 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of a plurality of layers of the dried fiber material on a forming surface; (d) isostatically pressing the plurality of layers to form a rigid and densified composite of the layers; (e) machining said composite to a desired shape; (f) applying at least one more layer of saturated fiber material to said composite; (g) isostatically pressing to coalesce the polymer particles of said layer to said machined preform. (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 42
Dependent Claim
166 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of a plurality of layers of the dried fiber material on a forming surface; (d) isostatically pressing the plurality of layers to form a rigid and densified composite of the layers; (e) machining said composite to a desired shape; (f) applying at least one more layer of saturated fiber material to said composite; (g) isostatically pressing to coalesce the polymer particles of said layer to said machined preform. (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 43
Dependent Claim
15 words
The method of claim 1 wherein: said steps of (c), (d) and (e) are repeated.
Claim 44
Dependent Claim
24 words
The structure of claim 37 formed by: including a layer of fluorocarbon polymer material between layers of dried fiber material having interspersed polymer particles.
Claim 45
Dependent Claim
24 words
The structure according to claims 37, 38, or 39 wherein: said fiber material is fabric material woven from said strands of inorganic fiber material.
Claim 46
Dependent Claim
46 words
The structure of claim 37 wherein said structure is formed by: forming a first layer of straned fiber material in a first direction on said forming surface; and forming a second layer of stranded fiber material in a second direction on said first layer of strands.
Claim 47
Dependent Claim
23 words
The structure according to claim 41 wherein said structure is formed by: forming a third layer of stranded fiber material on said composite.
Claim 48
Dependent Claim
34 words
The structure according to claim 41 wherein: said first layer of stranded fiber material is wound circumferentially about a mandrel; and said second layer of stranded fiber material is wound longitudinally about a mandrel.
Claim 49
Dependent Claim
23 words
The structure of claim 43 wherein said structure is formed by: forming a third layer of stranded fiber material circumferentially about the mandrel.
Claim 50
Dependent Claim
43 words
The structure according to claim 37 wherein said structure is formed by: isostatic pressing at a pressure range of from about 5,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 200° C.
Claim 51
Dependent Claim
43 words
The structure according to claim 37 wherein said structure is formed by: isostatic pressing at a pressure range of from about 30,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 40° C.
Claim 52
Dependent Claim
24 words
The structure according to claim 37 wherein said structure is formed by: machining the assembly as necessary to form a body of desired shape.
Claim 53
Dependent Claim
24 words
The unitary structure or claim 46 wherein: said unitary structure is a radome in the form of a body of revolution about an axis.
Claim 54
Dependent Claim
24 words
The unitary structure of claim 47 wherein: said unitary structure is a randome in the form of a body of revolution about an axis.
Claim 55
Dependent Claim
24 words
The unitary structure of claim 37 wherein: said unitary structure is a radome in the form of a body of revolution about an axis.
Claim 56
Dependent Claim
135 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) applying to said preform a powdered composite layer of fibers and fluorocarbon polymer; (e) isostatically pressing said powdered composite layer over said preform; (f) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (g) cooling said assembly.
Claim 57
Dependent Claim
135 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) applying to said preform a powdered composite layer of fibers and fluorocarbon polymer; (e) isostatically pressing said powdered composite layer over said preform; (f) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (g) cooling said assembly.
Claim 58
Dependent Claim
34 words
The structure of claim 51 wherein said structure is formed by: machining said preform as necessary to form a desired shape; and machining said assembly as necessary to form a body of desired shape.
Claim 59
Dependent Claim
43 words
The structure of claims 51 or 52 wherein: said structural preform is formed of a plurality of layers of dried fiber material on a forming surface, said plurality of layers being isostatically pressed to form a rigid and densified composite of the layers.
Claim 60
Dependent Claim
24 words
The structure of claim 53 wherein: said structural preform is formed of successive pluralities of layers of dried fiber material which are isostatically pressed.
Claim 61
Dependent Claim
24 words
The structure according to claims 51, 52 or 54 wherein: said fiber material is fabric material woven from said strands of inorganic fiber material.
Claim 62
Dependent Claim
46 words
The structure of claim 51 wherein structural preform is formed by: forming a first layer of stranded fiber material in a first direction on said forming surface; and forming a second layer of stranded fiber material in a second direction on said first layer of strands.
Claim 63
Dependent Claim
18 words
The structure according to claim 56 including: a third layer of stranded fiber material applied to said composite.
Claim 64
Dependent Claim
34 words
The structure according to claim 56 wherein: said first layer of stranded fiber material is wound circumferentially about a mandrel; and said second layer of stranded fiber material is wound longitudinally about a mandrel.
Claim 65
Dependent Claim
19 words
The structure according to claim 58 including: a third layer of stranded fiber material applied circumferentially about the mandrel.
Claim 66
Dependent Claim
43 words
The structure according to claim 51 wherein said structure is formed by: isostatic pressing at a pressure range of from about 5,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 200° C.
Claim 67
Dependent Claim
43 words
The structure according to claim 51 wherein said structure is formed by: isostatic pressing at a pressure range of from about 30,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 40° C.
Claim 68
Dependent Claim
24 words
The unitary structure of claim 60 wherein: said unitary structure is a radome in the form of a body of revolution about an axis.
Claim 69
Dependent Claim
24 words
The unitary structure of claim 61 wherein: said unitary structure is a radome in the form of a body of revolution about an axis.
Claim 70
Dependent Claim
24 words
The unitary structure of claim 51 wherein: said unitary structure is a radome in the form of a body of revolution about an axis.
Claim 71
Dependent Claim
142 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) forming segments of fiber reinforced fluoropolymer material of a complex shape; (e) stacking said segments in a mold; (f) placing said structural preform in sa d mold within said segments; (g) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (h) cooling said assembly.
Claim 72
Dependent Claim
142 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a structural preform of at least one layer of dried fiber material on a forming surface; (d) forming segments of fiber reinforced fluoropolymer material of a complex shape; (e) stacking said segments in a mold; (f) placing said structural preform in sa d mold within said segments; (g) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (h) cooling said assembly.
Claim 73
Dependent Claim
34 words
The structure of claim 65 wherein said structure is formed by: machining said preform as necessary to form a desired shape; and machining said assembly as necessary to form a body of desired shape.
Claim 74
Dependent Claim
42 words
The structure of claims 65 or 66 wherein: said structural preform is formed of a plurality of layers dried fiber material on a forming surface, said plurality of layers being isostatically pressed to form a rigid and densified composite of the layers.
Claim 75
Dependent Claim
24 words
The structure of claim 67 wherein: said structural preform is formed of successive pluralities of layers of dried fiber material which are isostatically pressed.
Claim 76
Dependent Claim
23 words
The structure according to claim 65 or 66 wherein: said fiber material is fabric material woven from said strands of inorganic fiber material.
Claim 77
Dependent Claim
47 words
The structure of claim 65 wherein said structural preform is formed by: forming a first layer of stranded fiber material in a first direction on said forming surface; and forming a second layer of stranded fiber material in a second direction on said first layer of strands.
Claim 78
Dependent Claim
18 words
The structure according to claim 70 including: a third layer of stranded fiber material applied to said composite.
Claim 79
Dependent Claim
34 words
The structure according to claim 70 wherein: said first layer of stranded fiber material is wound circumferentially about a mandrel; and said second layer of stranded fiber material is wound longitudinally about a mandrel.
Claim 80
Dependent Claim
19 words
The structure according to claim 72 including: a third layer of stranded fiber material applied circumferentially about the mandrel.
Claim 81
Dependent Claim
43 words
The structure according to claim 65 wherein said structure is formed by: isostatic pressing at a pressure range of from about 5,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 200° C.
Claim 82
Dependent Claim
43 words
The structure according to claim 65 wherein said structure is formed by: isostatic pressing at a pressure range of from about 30,000 psi to about 100,000 psi and at a temperature in the range of from about 20° C. to about 40° C.
Claim 83
Dependent Claim
208 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a first layer of the dried fiber material in strand form on a forming surface, with the strand material generally oriented in a first direction; (d) placing over said strand layer a second layer of segments of the dried fiber material in woven from, said woven material having a high strand weight ratio in a second direction; (e) isostatically pressing said first and second layers to form a rigid and densified composite of said layers; (f) applying a third layer of the dried fiber material in strand form over said composite in the direction of said first layer; (g) isostatically pressing to coalesce the polymer particles of said third layer of said composite; (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 84
Dependent Claim
208 words
A unitary structure of predetermined shape, said structure being formed by: (a) saturating continuous strands of inorganic fiber material with fluorocarbon polymer material, the fluorocarbon polymer material being in the form of an aqueous dispersion; (b) drying the saturated fiber material to form fiber material having fluorocarbon polymer particles interspersed among and coated onto the fibers; (c) forming a first layer of the dried fiber material in strand form on a forming surface, with the strand material generally oriented in a first direction; (d) placing over said strand layer a second layer of segments of the dried fiber material in woven from, said woven material having a high strand weight ratio in a second direction; (e) isostatically pressing said first and second layers to form a rigid and densified composite of said layers; (f) applying a third layer of the dried fiber material in strand form over said composite in the direction of said first layer; (g) isostatically pressing to coalesce the polymer particles of said third layer of said composite; (h) heating the assembly to an elevated temperature above the crystalline melt point of the fluorocarbon polymer material and maintaining said assembly at said elevated temperature for a predetermined period of time; and (i) cooling said assembly.
Claim 85
Dependent Claim
25 words
The structure of claim 76 wherein: said segments of material in woven form are arranged in edge abutting relationship to entirely cover said first layer.
Claim 86
Dependent Claim
54 words
The structure of claims 76 or 77 wherein: said first layer of strand material is wound circumferentially about a mandrel; and said second layer of woven material has a majority of fibers in a direction longitudinal with respect to the mandrel; and said third layer of strand material is wound circumferentially about the mandrel.
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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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |