US4981822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite containing coated fibrous material
Assignee: General Electric Co
•
Filing: 1989-08-21
•
Granted: 1991-01-01
•
Expires: 2009-08-21
Abstract
Abstract A composite is produced by depositing a slurry of infiltration-promoting material and organic binding material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, firing the tape to burn out organic binding material and infiltrating the resulting porous body with a solution of boron and silicon.
Inventors
- 👤 Raj N. Singh
- 👤 Achuta R. Gaddipati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:39
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/52; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B35/71; C04B35/78; C04B35/80; C04B41/4584; C04B41/50; C04B41/5093; C04B41/5096; C04B41/80; C04B41/81; C04B41/85; C04B41/89; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124
Claims Analysis
Total Claims: 94
Claim 1
Independent Claim
156 words
A composite comprised of a ceramic matrix and boron nitride coated fibrous material, more than 70% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 20% by volume.
Claim 2
Dependent Claim
156 words
A composite comprised of a ceramic matrix and boron nitride coated fibrous material, more than 70% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 20% by volume.
Claim 3
Dependent Claim
17 words
The composite according to claim 1, wherein at least 70% by volume of said matrix is crystalline.
Claim 4
Dependent Claim
15 words
The composite according to claim 1, wherein said porosity is less than 10% by volume.
Claim 5
Dependent Claim
103 words
The composite according to claim 1, wherein said fibrous material is selected from the group consisting of aluminum oxide, mullite, a carbon-containing material containing carbon in an amount of at least 5% by weight of said fibrous material, elemental carbon, a SiC-containing material containing at least 50% by weight of silicon and at least 25% by weight of carbon based on the weight of said SiC-containing material, silicon carbide, a silicon nitride-containing material containing at least 50% by weight of silicon and at least 25% by weight of nitrogen based on the weight of said silicon nitride-containing material, silicon nitride, and mixtures thereof.
Claim 6
Dependent Claim
15 words
The composite according to claim 1, wherein said fibrous material is comprised of elemental carbon.
Claim 7
Dependent Claim
38 words
The composite according to claim 1, wherein said fibrous material is a SiC-containing material containing at least 50% by weight of silicon and at least 25% by weight of carbon based on the weight of said SiC-containing material.
Claim 8
Dependent Claim
36 words
The composite according to claim 1, wherein said matrix is comprised of said solution phase of boron and silicon and a member selected from the group consisting of silicon carbide, boron-containing silicon carbide, and mixtures thereof.
Claim 9
Dependent Claim
161 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 70% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 20% by volume.
Claim 10
Dependent Claim
161 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 70% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 20% by volume.
Claim 11
Dependent Claim
46 words
The composite according to claim 8, wherein said coated fibrous material is comprised of a plurality of boron nitride coated continuous filaments, substantially all of said coated filaments in each said layer being spaced from each other and being at least substantially parallel to each other.
Claim 12
Dependent Claim
15 words
The composite according to claim 8, wherein said porosity is less than 10% by volume.
Claim 13
Dependent Claim
103 words
The composite according to claim 8, wherein said fibrous material is selected from the group consisting of aluminum oxide, mullite, a carbon-containing material containing carbon in an amount of at least 5% by weight of said fibrous material, elemental carbon, a SiC-containing material containing at least 50% by weight of silicon and at least 25% by weight of carbon based on the weight of said SiC-containing material, silicon carbide, a silicon nitride-containing material containing at least 50% by weight of silicon and at least 25% by weight of nitrogen based on the weight of said silicon nitride-containing material, silicon nitride, and mixtures thereof.
Claim 14
Dependent Claim
15 words
The composite according to claim 8, wherein said fibrous material is comprised of elemental carbon.
Claim 15
Dependent Claim
39 words
The composite according to claim 8, wherein said fibrous material is comprised of SiC-containing material containing at least 50% by weight of silicon and at least 25% by weight of carbon based on the weight of said SiC-containing material.
Claim 16
Dependent Claim
36 words
The composite according to claim 8, wherein said matrix is comprised of said solution phase of boron and silicon and a member selected from the group consisting of silicon carbide, boron-containing silicon carbide, and mixtures thereof.
Claim 17
Dependent Claim
194 words
A composite comprised of a ceramic matrix and a plurality of layers of coated filaments, each layer being comprised of a plurality of boron nitride coated filaments spaced from each other and substantially parallel to each other, said layers of coated filaments being separated from each other by said matrix, more than 95% of the surface area of said coated filaments being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, at least 70% by volume of said matrix being crystalline, said coated filaments comprising at least 10% by volume of said composite, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said coated filaments, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 18
Dependent Claim
194 words
A composite comprised of a ceramic matrix and a plurality of layers of coated filaments, each layer being comprised of a plurality of boron nitride coated filaments spaced from each other and substantially parallel to each other, said layers of coated filaments being separated from each other by said matrix, more than 95% of the surface area of said coated filaments being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, at least 70% by volume of said matrix being crystalline, said coated filaments comprising at least 10% by volume of said composite, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said coated filaments, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 19
Dependent Claim
36 words
The composite according to claim 15, wherein said matrix is comprised of said solution phase of boron and silicon and a member selected from the group consisting of silicon carbide, boron-containing silicon carbide, and mixtures thereof.
Claim 20
Dependent Claim
31 words
The composite according to claim 1, wherein said matrix has a thermal expansion coefficient ranging from less than to about the same as that of said boron nitride coated fibrous material.
Claim 21
Dependent Claim
24 words
The composite according to claim 1, wherein said matrix is comprised of said solution phase of boron and silicon, molybdenum silicide, and silicon carbide.
Claim 22
Dependent Claim
28 words
The composite according to claim 1, wherein said matrix is in direct contact with more than 90% of the surface area of said boron nitride coated fibrous material.
Claim 23
Dependent Claim
28 words
The composite according to claim 1, wherein said matrix is in direct contact with more than 99% of the surface area of said boron nitride coated fibrous material.
Claim 24
Dependent Claim
23 words
The composite according to claim 1, wherein said boron nitride coated fibrous material ranges from 20% to 60% by volume of said composite.
Claim 25
Dependent Claim
21 words
The composite according to claim 1, wherein said matrix contains crystalline whiskers ranging up to 50% by volume of said matrix.
Claim 26
Dependent Claim
23 words
The composite according to claim 1, wherein said solution of boron and silicon ranges from 1% to 50% by volume of said matrix.
Claim 27
Dependent Claim
27 words
The composite according to claim 1, wherein said matrix contains elemental carbon ranging from an amount detectable by microprobe analysis to 10% by volume of the matrix.
Claim 28
Dependent Claim
22 words
The composite according to claim 1, wherein said matrix is comprised of said solution phase of boron and silicon and molybdenum silicide.
Claim 29
Dependent Claim
15 words
The composite according to claim 1, wherein said fibrous material is comprised of continuous filaments.
Claim 30
Dependent Claim
30 words
The composite according to claim 1, wherein said fibrous material is a carbon-containing material which contains carbon in an amount of at least 1% by weight of the fibrous material.
Claim 31
Dependent Claim
31 words
The composite according to claim 8, wherein said matrix has a thermal expansion coefficient ranging from less than to about the same as that of said boron nitride coated fibrous material.
Claim 32
Dependent Claim
24 words
The composite according to claim 5, wherein said matrix is comprised of said solution phase of boron and silicon, molybdenum silicide and silicon carbide.
Claim 33
Dependent Claim
28 words
The composite according to claim 8, wherein said matrix is in direct contact with more than 90% of the surface area of said boron nitride coated fibrous material.
Claim 34
Dependent Claim
28 words
The composite according to claim 8, wherein said matrix is in direct contact with more than 99% of the surface area of said boron nitride coated fibrous material.
Claim 35
Dependent Claim
23 words
The composite according to claim 8, wherein said boron nitride coated fibrous material ranges from 20% to 60% by volume of said composite.
Claim 36
Dependent Claim
21 words
The composite according to claim 8, wherein said matrix contains crystalline whiskers ranging up to 50% by volume of said matrix.
Claim 37
Dependent Claim
23 words
The composite according to claim 8, wherein said solution of boron and silicon ranges from 1% to 50% by volume of said matrix.
Claim 38
Dependent Claim
27 words
The composite according to claim 8, wherein said matrix contains elemental carbon ranging from an amount detectable by microprobe analysis to 10% by volume of the matrix.
Claim 39
Dependent Claim
23 words
The composite according to claim 8, wherein said matrix phase is comprised of said solution phase of boron and silicon and molybdenum silicide.
Claim 40
Dependent Claim
15 words
The composite according to claim 8, wherein said fibrous material is comprised of continuous filaments.
Claim 41
Dependent Claim
30 words
The composite according to claim 8, wherein said fibrous material is a carbon-containing material which contains carbon in an amount of at least 1% by weight of the fibrous material.
Claim 42
Dependent Claim
18 words
The composite according to claim 8, wherein said porosity is less than 1% by volume of said composite.
Claim 43
Dependent Claim
192 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 80% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said layers of boron nitride coated fibrous material being substantially parallel to each other and separated from each other by matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, at least 70% by volume of said matrix being crystalline, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 44
Dependent Claim
192 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 80% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said layers of boron nitride coated fibrous material being substantially parallel to each other and separated from each other by matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, at least 70% by volume of said matrix being crystalline, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 45
Dependent Claim
171 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 70% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, at least 70% by volume of said matrix being crystalline, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 20% by volume.
Claim 46
Dependent Claim
171 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 70% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, at least 70% by volume of said matrix being crystalline, said matrix containing a phase ranging from a detectable amount to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said detectable amount of said solution phase of boron and silicon being detectable by microprobe analysis, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 20% by volume.
Claim 47
Dependent Claim
31 words
The composite according to claim 41, wherein said matrix has a thermal expansion coefficient ranging from less than to about the same as that of said boron nitride coated fibrous material.
Claim 48
Dependent Claim
28 words
The composite according to claim 41, wherein said matrix is in direct contact with more than 80% of the surface area of said boron nitride coated fibrous material.
Claim 49
Dependent Claim
28 words
The composite according to claim 41, wherein said matrix is in direct contact with more than 90% of the surface area of said boron nitride coated fibrous material.
Claim 50
Dependent Claim
28 words
The composite according to claim 41, wherein said matrix is in direct contact with more than 99% of the surface area of said boron nitride coated fibrous material.
Claim 51
Dependent Claim
23 words
The composite according to claim 41, wherein said boron nitride coated fibrous material ranges from 20% to 60% by volume of said composite.
Claim 52
Dependent Claim
21 words
The composite according to claim 41, wherein said matrix contains crystalline whiskers ranging up to 50% by volume of said matrix.
Claim 53
Dependent Claim
23 words
The composite according to claim 41, wherein said solution of boron and silicon ranges from 1% to 50% by volume of said matrix.
Claim 54
Dependent Claim
22 words
The composite according to claim 41, wherein said matrix is comprised of said solution phase of boron and silicon and molybdenum silicide.
Claim 55
Dependent Claim
24 words
The composite according to claim 41, wherein said matrix is comprised of said solution phase of boron and silicon, molybdenum silicide, and silicon carbide.
Claim 56
Dependent Claim
15 words
The composite according to claim 41, wherein said fibrous material is comprised of continuous filaments.
Claim 57
Dependent Claim
30 words
The composite according to claim 41, wherein said fibrous material is a carbon-containing material which contains carbon in an amount of at least 1% by weight of the fibrous material.
Claim 58
Dependent Claim
15 words
The composite according to claim 41, wherein said porosity is less than 10% by volume.
Claim 59
Dependent Claim
103 words
The composite according to claim 41, wherein said fibrous material is selected from the group consisting of aluminum oxide, mullite, a carbon-containing material containing carbon in an amount of at least 5% by weight of said fibrous material, elemental carbon, a SiC-containing material containing at least 50% by weight of silicon and at least 25% by weight of carbon based on the weight of said SiC-containing material, silicon carbide, a silicon nitride-containing material containing at least 50% by weight of silicon and at least 25% by weight of nitrogen based on the weight of said silicon nitride-containing material, silicon nitride, and mixtures thereof.
Claim 60
Dependent Claim
38 words
The composite according to claim 41, wherein said fibrous material is a SiC-containing material containing at least 50% by weight of silicon and at least 25% by weight of carbon based on the weight of said SiC-containing material.
Claim 61
Dependent Claim
17 words
The composite according to claim 41, wherein at least 90% by volume of said matrix is crystalline.
Claim 62
Dependent Claim
27 words
The composite according to claim 41, wherein said matrix contains elemental carbon ranging from an amount detectable by microprobe analysis to 10% by volume of the matrix.
Claim 63
Dependent Claim
36 words
The composite according to claim 41, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of metal carbide, metal nitride, metal silicide, and mixtures thereof.
Claim 64
Dependent Claim
40 words
The composite according to claim 41, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of boron carbide, molybdenum carbide, niobium carbide, silicon carbide, titanium carbide, and mixtures thereof.
Claim 65
Dependent Claim
40 words
The composite according to claim 41, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of aluminum nitride, niobium nitride, silicon nitride, titanium nitride, zirconium nitride, and mixtures thereof.
Claim 66
Dependent Claim
42 words
The composite according to claim 41, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of chromium silicide, molybdenum silicide, tantalum silicide, titanium silicide, tungsten silicide, zirconium silicide, and mixtures thereof.
Claim 67
Dependent Claim
153 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 90% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, at least 90% by volume of said matrix being crystalline, said matrix containing a phase ranging from 1% to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 68
Dependent Claim
153 words
A composite comprised of a ceramic matrix and a plurality of layers of boron nitride coated fibrous material, more than 90% of the surface area of said boron nitride coated fibrous material being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, said boron nitride coated fibrous material comprising at least 10% by volume of said composite, at least 90% by volume of said matrix being crystalline, said matrix containing a phase ranging from 1% to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said boron nitride coated fibrous material, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 69
Dependent Claim
163 words
A composite comprised of a ceramic matrix and a plurality of layers of coated filaments, each layer being comprised of a plurality of boron nitride coated filaments spaced from each other and substantially parallel to each other, more than 90% of the surface area of said coated filaments being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, at least 90% by volume of said matrix being crystalline, said matrix containing a phase ranging from 1% to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said coated filaments comprising at least 10% by volume of said composite, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said coated filaments, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 70
Dependent Claim
163 words
A composite comprised of a ceramic matrix and a plurality of layers of coated filaments, each layer being comprised of a plurality of boron nitride coated filaments spaced from each other and substantially parallel to each other, more than 90% of the surface area of said coated filaments being in direct contact with said matrix, said matrix comprising at least 30% by volume of said composite, at least 90% by volume of said matrix being crystalline, said matrix containing a phase ranging from 1% to 50% by volume of said matrix comprised of a solution of boron and elemental silicon wherein boron is present in an amount of at least 0.1% by weight of silicon, said coated filaments comprising at least 10% by volume of said composite, said matrix having a thermal expansion coefficient which is less than 15% higher than that of said coated filaments, said matrix being continuous and interconnecting, said composite having a porosity of less than 10% by volume.
Claim 71
Dependent Claim
36 words
The composite according to claim 1, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of metal carbide, metal nitride, metal silicide, and mixtures thereof.
Claim 72
Dependent Claim
40 words
The composite according to claim 1, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of boron carbide, molybdenum carbide, niobium carbide, silicon carbide, titanium carbide, and mixtures thereof.
Claim 73
Dependent Claim
40 words
The composite according to claim 1, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of aluminum nitride, niobium nitride, silicon nitride, titanium nitride, zirconium nitride, and mixtures thereof.
Claim 74
Dependent Claim
42 words
The composite according to claim 1, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of chromium silicide, molybdenum silicide, tantalum silicide, titanium silicide, tungsten silicide, zirconium silicide, and mixtures thereof.
Claim 75
Dependent Claim
36 words
The composite according to claim 8, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of metal carbide, metal nitride, metal silicide, and mixtures thereof.
Claim 76
Dependent Claim
40 words
The composite according to claim 8, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of boron carbide, molybdenum carbide, niobium carbide, silicon carbide, titanium carbide, and mixtures thereof.
Claim 77
Dependent Claim
40 words
The composite according to claim 8, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of aluminum nitride, niobium nitride, silicon nitride, titanium nitride, zirconium nitride, and mixtures thereof.
Claim 78
Dependent Claim
42 words
The composite according to claim 8, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of chromium silicide, molybdenum silicide, tantalum silicide, titanium silicide, tungsten silicide, zirconium silicide, and mixtures thereof.
Claim 79
Dependent Claim
36 words
The composition according to claim 15, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of metal carbide, metal nitride, metal silicide, and mixtures thereof.
Claim 80
Dependent Claim
40 words
The composition according to claim 15, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of boron carbide, molybdenum carbide, niobium carbide, silicon carbide, titanium carbide, and mixtures thereof.
Claim 81
Dependent Claim
40 words
The composition according to claim 15, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of aluminum nitride, niobium nitride, silicon nitride, titanium nitride, zirconium nitride, and mixtures thereof.
Claim 82
Dependent Claim
42 words
The composition according to claim 15, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of chromium silicide, molybdenum silicide, tantalum silicide, titanium silicide, tungsten silicide, zirconium silicide, and mixtures thereof.
Claim 83
Dependent Claim
36 words
The composition according to claim 40, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of metal carbide, metal nitride, metal silicide, and mixtures thereof.
Claim 84
Dependent Claim
40 words
The composition according to claim 40, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of boron carbide, molybdenum carbide, niobium carbide, silicon carbide, titanium carbide, and mixtures thereof.
Claim 85
Dependent Claim
40 words
The composition according to claim 40, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of aluminum nitride, niobium nitride, silicon nitride, titanium nitride, zirconium nitride, and mixtures thereof.
Claim 86
Dependent Claim
41 words
The composition according to claim 40, wherein said matrix comprised of said solution of boron and silicon and a member selected from the group consisting of chromium silicide, molybdenum silicide, tantalum silicide, titanium silicide, tungsten silicide, zirconium silicide, and mixtures thereof.
Claim 87
Dependent Claim
36 words
The composition according to claim 62, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of metal carbide, metal nitride, metal silicide, and mixtures thereof.
Claim 88
Dependent Claim
41 words
The composition according to claim 62, wherein said matrix is comprised of the group consisting of boron and silicon and a member selected from the group consisting of boron carbide, molybdenum carbide, niobium carbide, silicon carbide, titanium carbide, and mixtures thereof.
Claim 89
Dependent Claim
40 words
The compositions according to claim 62, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of aluminum nitride, niobium nitride, silicon nitride, titanium nitride, zirconium nitride, and mixtures thereof.
Claim 90
Dependent Claim
41 words
The composition according to claim 62, wherein said matrix comprised of said solution of boron and silicon and a member selected from the group consisting of chromium silicide, molybdenum silicide, tantalum silicide, titanium silicide, tungsten silicide, zirconium silicide, and mixtures thereof.
Claim 91
Dependent Claim
36 words
The composition according to claim 63, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of metal carbide, metal nitride, metal silicide, and mixtures thereof.
Claim 92
Dependent Claim
40 words
The composition according to claim 63, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of boron carbide, molybdenum carbide, niobium carbide, silicon carbide, titanium carbide, and mixtures thereof.
Claim 93
Dependent Claim
40 words
The composition according to claim 63, wherein said matrix is comprised of said solution of boron and silicon and a member selected from the group consisting of aluminum nitride, niobium nitride, silicon nitride, titanium nitride, zirconium nitride, and mixtures thereof.
Claim 94
Dependent Claim
41 words
The composition according to claim 63, wherein said matrix comprised of said solution of boron and silicon and a member selected from the group consisting of chromium silicide, molybdenum silicide, tantalum silicide, titanium silicide, tungsten silicide, zirconium silicide, and mixtures thereof.
References Cited (Backward Citations)
US3788893A
Cited
US3565683A
Cited
US4141948A
Cited
US4120731A
Cited
US4220455A
Cited
US4247304A
Cited
EP0130103A1
Cited
US4642771A
Cited
US4636480A
Cited
US4640899A
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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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |