US3867491A — Process for reinforced carbon bodies

Claim 1

Independent Claim 29 words

A PROCESS FOR PRODUCING A REINFORCED CARBON BODY HAVING A SHAPE COMPRISING AN OUTER PERIMETER AND TWO OPPOSITE FACES, EACH FACE ADJOINING THE OUTER PERIMETER, COMPRISING THE STEPS OF

Claim 2

Dependent Claim 29 words

A PROCESS FOR PRODUCING A REINFORCED CARBON BODY HAVING A SHAPE COMPRISING AN OUTER PERIMETER AND TWO OPPOSITE FACES, EACH FACE ADJOINING THE OUTER PERIMETER, COMPRISING THE STEPS OF

Claim 3

Dependent Claim 75 words

SUCCESSIVELY CIRCUMFERENTIALLY WINDING REINFORCING CARBON FIBERS LOOSELY ABOUT A MANDREL TO FORM AN ASSEMBLY OF LOOSELY WOUND CARBON FIBERS HAVING AN OUTER PERIMETER APPROXIMATING IN LENGTH THE DESIRED OUTER PERIMETER OF THE FINISHED CARBON BODY, AND A WIDTH GREATER THAN THE DESIRED AXIAL THICKNESS OF THE FINISHED CARBON BODY, SAID CARBON FIBERS HAVING A WIDTH HAVING A RATIO TO THE DESIRED AXIAL THICKNESS OF THE FINISHED CARBON BODY RANGING FROM ABOUT 1.25:1 TO ABOUT 3:1;

Claim 4

Dependent Claim 75 words

SUCCESSIVELY CIRCUMFERENTIALLY WINDING REINFORCING CARBON FIBERS LOOSELY ABOUT A MANDREL TO FORM AN ASSEMBLY OF LOOSELY WOUND CARBON FIBERS HAVING AN OUTER PERIMETER APPROXIMATING IN LENGTH THE DESIRED OUTER PERIMETER OF THE FINISHED CARBON BODY, AND A WIDTH GREATER THAN THE DESIRED AXIAL THICKNESS OF THE FINISHED CARBON BODY, SAID CARBON FIBERS HAVING A WIDTH HAVING A RATIO TO THE DESIRED AXIAL THICKNESS OF THE FINISHED CARBON BODY RANGING FROM ABOUT 1.25:1 TO ABOUT 3:1;

Claim 5

Dependent Claim 99 words

PLACING THE ASSEMBLY OF LOOSELY WOUND CARBON FIBERS IN A MOLD CAVITY OF A MOLD COMPRISING A. AN OUTER PERIMETER CONFORMING ESSENTIALLY TO THE DESIRED SIZE AND SHAPE OF THE OUTER PERIMETER OF THE DESIRED CARBON BODY; AND B. A PAIR OF COMPRESSION PLATES HAVING MUTUALLY OPPOSED FACES WHICH CONFORM ESSENTIALLY TO THE DESIRED SIZES AND SHAPES OF THE FACES OF THE DESIRED CARBON BODY; SAID PLATES BEING COAXIALLY ALIGNED WITH EACH OTHER AND WITH THE MOLD OUTER PERIMETER, AND FORMING, WITH SAID MOLD OUTER PERIMETER, A MOLD CAVITY, THE DISTANCE BETWEEN SAID PLATES BEING VARIABLE BY AXIAL MOVEMENT;

Claim 6

Dependent Claim 99 words

PLACING THE ASSEMBLY OF LOOSELY WOUND CARBON FIBERS IN A MOLD CAVITY OF A MOLD COMPRISING A. AN OUTER PERIMETER CONFORMING ESSENTIALLY TO THE DESIRED SIZE AND SHAPE OF THE OUTER PERIMETER OF THE DESIRED CARBON BODY; AND B. A PAIR OF COMPRESSION PLATES HAVING MUTUALLY OPPOSED FACES WHICH CONFORM ESSENTIALLY TO THE DESIRED SIZES AND SHAPES OF THE FACES OF THE DESIRED CARBON BODY; SAID PLATES BEING COAXIALLY ALIGNED WITH EACH OTHER AND WITH THE MOLD OUTER PERIMETER, AND FORMING, WITH SAID MOLD OUTER PERIMETER, A MOLD CAVITY, THE DISTANCE BETWEEN SAID PLATES BEING VARIABLE BY AXIAL MOVEMENT;

Claim 7

Dependent Claim 99 words

placing the assembly of loosely wound carbon fibers in a mold cavity of a mold comprising a. an outer perimeter conforming essentially to the desired size and shape of the outer perimeter of the desired carbon body; and b. a pair of compression plates having mutually opposed faces which conform essentially to the desired sizes and shapes of the faces of the desired carbon body; said plates being coaxially aligned with each other and with the mold outer perimeter, and forming, with said mold outer perimeter, a mold cavity, the distance between said plates being variable by axial movement;

Claim 8

Dependent Claim 99 words

placing the assembly of loosely wound carbon fibers in a mold cavity of a mold comprising a. an outer perimeter conforming essentially to the desired size and shape of the outer perimeter of the desired carbon body; and b. a pair of compression plates having mutually opposed faces which conform essentially to the desired sizes and shapes of the faces of the desired carbon body; said plates being coaxially aligned with each other and with the mold outer perimeter, and forming, with said mold outer perimeter, a mold cavity, the distance between said plates being variable by axial movement;

Claim 9

Dependent Claim 6 words

The process of claim 1, wherein

Claim 10

Dependent Claim 29 words

the faces of the carbon body and of the compression plates of the mold are essentially flat, mutually parallel, and perpendicular to the axis of the annular carbon body;

Claim 11

Dependent Claim 29 words

the faces of the carbon body and of the compression plates of the mold are essentially flat, mutually parallel, and perpendicular to the axis of the annular carbon body;

Claim 12

Dependent Claim 10 words

the carbon body has a circumferentially nonuniform radial depth; and

Claim 13

Dependent Claim 10 words

the carbon body has a circumferentially nonuniform radial depth; and

Claim 14

Dependent Claim 21 words

impregnating the loosely wound assembly of carbon fibers, within the mold and prior to axial compression, with a heat-curable carbonizable binder;

Claim 15

Dependent Claim 21 words

impregnating the loosely wound assembly of carbon fibers, within the mold and prior to axial compression, with a heat-curable carbonizable binder;

Claim 16

Dependent Claim 22 words

after placing the assembly of fibers within the mold, aligning the marking means to approximate the original orientation of the marking means.

Claim 17

Dependent Claim 22 words

after placing the assembly of fibers within the mold, aligning the marking means to approximate the original orientation of the marking means.

Claim 18

Dependent Claim 41 words

radially compressing the annular shape, whereby to effect circumferential overlapping of the reinforced carbon fibers in locations of greater radial depth and whereby to balance the fiber density of the reinforcing carbon fibers to compensate for the circumferentially nonuniform radial depth;

Claim 19

Dependent Claim 41 words

radially compressing the annular shape, whereby to effect circumferential overlapping of the reinforced carbon fibers in locations of greater radial depth and whereby to balance the fiber density of the reinforcing carbon fibers to compensate for the circumferentially nonuniform radial depth;

Claim 20

Dependent Claim 29 words

the faces of the carbon bodies and of the compression plates of the mold are essentially flat, mutually parallel, and perpendicular to the axis of the annular carbon body;

Claim 21

Dependent Claim 29 words

the faces of the carbon bodies and of the compression plates of the mold are essentially flat, mutually parallel, and perpendicular to the axis of the annular carbon body;

Claim 22

Dependent Claim 182 words

placing the assembly of loosely wound carbon fibers in a mold cavity of a mold comprising a. an outer perimeter conforming essentially to the desired size and shape of the outer perimeter of the desired carbon body; and b. a pair of compression plates having mutually opposed faces which conform essentially to the desired sizes and shapes of the faces of the desired carbon body; said plates being coaxially aligned with each other and with the mold outer perimeter, and forming, with said mold outer perimeter, a mold cavity, the distance between said plates being variable by axial movement; axially moving the compression plates together until the plates are separated by approximately the desired axial thickness of the finished carbon body, whereby the circumferentially wound carbon fibers become axially compressed and radially overlapped throughout the circumference of the body in each cross-sectional plane containing the axis of the body; said body having at least one perimeter which is adapted to bear circumferential stress, the circumferentially wound reinforcing fibers adjacent to said stress-bearing perimeter conforming essentially to the shape of said stress-bearing perimeter;

Claim 23

Dependent Claim 182 words

placing the assembly of loosely wound carbon fibers in a mold cavity of a mold comprising a. an outer perimeter conforming essentially to the desired size and shape of the outer perimeter of the desired carbon body; and b. a pair of compression plates having mutually opposed faces which conform essentially to the desired sizes and shapes of the faces of the desired carbon body; said plates being coaxially aligned with each other and with the mold outer perimeter, and forming, with said mold outer perimeter, a mold cavity, the distance between said plates being variable by axial movement; axially moving the compression plates together until the plates are separated by approximately the desired axial thickness of the finished carbon body, whereby the circumferentially wound carbon fibers become axially compressed and radially overlapped throughout the circumference of the body in each cross-sectional plane containing the axis of the body; said body having at least one perimeter which is adapted to bear circumferential stress, the circumferentially wound reinforcing fibers adjacent to said stress-bearing perimeter conforming essentially to the shape of said stress-bearing perimeter;

Claim 24

Dependent Claim 27 words

the assemblies of loosely wound carbon fibers are annular, each having an inner perimeter approximating in length the desired inner perimeter of the finished carbon bodies; and

Claim 25

Dependent Claim 27 words

the assemblies of loosely wound carbon fibers are annular, each having an inner perimeter approximating in length the desired inner perimeter of the finished carbon bodies; and

Claim 26

Dependent Claim 33 words

impregnation and reimpregnation of the assembly with carbonizable binder is accomplished by pressure impregnation at a pressure of at least about 8 kilograms per square centimeter for at least about 1 1/2 hours;

Claim 27

Dependent Claim 33 words

impregnation and reimpregnation of the assembly with carbonizable binder is accomplished by pressure impregnation at a pressure of at least about 8 kilograms per square centimeter for at least about 1 1/2 hours;

Claim 28

Dependent Claim 28 words

placing the impregnated shape of carbon fibers under axial compression to cause radial overlapping of the circumferentially wound carbon fibers, and to remove excess binder between the fibers;

Claim 29

Dependent Claim 28 words

placing the impregnated shape of carbon fibers under axial compression to cause radial overlapping of the circumferentially wound carbon fibers, and to remove excess binder between the fibers;

Claim 30

Dependent Claim 18 words

the fiber density of the reinforcing carbon fibers is balanced to compensate for the circumferentially nonuniform radial depth.

Claim 31

Dependent Claim 18 words

the fiber density of the reinforcing carbon fibers is balanced to compensate for the circumferentially nonuniform radial depth.

Claim 32

Dependent Claim 26 words

the assembly of loosely wound carbon fibers is annular, having an inner perimeter approximating in length the desired inner perimeter of the finished carbon body; and

Claim 33

Dependent Claim 26 words

the assembly of loosely wound carbon fibers is annular, having an inner perimeter approximating in length the desired inner perimeter of the finished carbon body; and

Claim 34

Dependent Claim 83 words

axially moving the compression plates together until the plates are separated by approximately the desired axial thickness of the finished carbon body, whereby the circumferentially wound carbon fibers become axially compressed and radially overlapped throughout the circumference of the body in each cross-sectional plane containing the axis of the body; said body having at least one perimeter which is adapted to bear circumferential stress, the circumferentially wound reinforcing fibers adjacent to said stress-bearing perimeter conforming essentially to the shape of said stress-bearing perimeter;

Claim 35

Dependent Claim 83 words

axially moving the compression plates together until the plates are separated by approximately the desired axial thickness of the finished carbon body, whereby the circumferentially wound carbon fibers become axially compressed and radially overlapped throughout the circumference of the body in each cross-sectional plane containing the axis of the body; said body having at least one perimeter which is adapted to bear circumferential stress, the circumferentially wound reinforcing fibers adjacent to said stress-bearing perimeter conforming essentially to the shape of said stress-bearing perimeter;

Claim 36

Dependent Claim 83 words

AXIALLY MOVING THE COMPRESSION PLATES TOGETHER UNTIL THE PLATES ARE SEPARATED BY APPROXIMATELY THE DESIRED AXIAL THICKNESS OF THE FINISHED CARBON BODY, WHEREBY THE CIRCUMFERENTIALLY WOUND CARBON FIBERS BECOME AXIALLY COMPRESSED AND RADIALLY OVERLAPPED THROUGHOUT THE CIRCUMFERENCE OF THE BODY IN EACH CROSS-SECTIONAL PLANE CONTAINING THE AXIS OF THE BODY; SAID BODY HAVING AT LEAST ONE PERIMETER WHICH IS ADAPTED TO BEAR CIRCUMFERENTIAL STRESS THE CIRCUMFERENTIALLY WOUND REINFORCING FIBERS ADJACENT TO SAID STRESS-BEARING PERIMETER CONFORMING ESSENTIALLY TO THE SHAPE OF SAID STRESS-BEARING PERIMETER;

Claim 37

Dependent Claim 83 words

AXIALLY MOVING THE COMPRESSION PLATES TOGETHER UNTIL THE PLATES ARE SEPARATED BY APPROXIMATELY THE DESIRED AXIAL THICKNESS OF THE FINISHED CARBON BODY, WHEREBY THE CIRCUMFERENTIALLY WOUND CARBON FIBERS BECOME AXIALLY COMPRESSED AND RADIALLY OVERLAPPED THROUGHOUT THE CIRCUMFERENCE OF THE BODY IN EACH CROSS-SECTIONAL PLANE CONTAINING THE AXIS OF THE BODY; SAID BODY HAVING AT LEAST ONE PERIMETER WHICH IS ADAPTED TO BEAR CIRCUMFERENTIAL STRESS THE CIRCUMFERENTIALLY WOUND REINFORCING FIBERS ADJACENT TO SAID STRESS-BEARING PERIMETER CONFORMING ESSENTIALLY TO THE SHAPE OF SAID STRESS-BEARING PERIMETER;

Claim 38

Dependent Claim 77 words

The process of claim 2, wherein the annular assembly of loosely wound carbon fibers is prepared by spirally winding woven carbon cloth loosely about a mandrel until the outer perimeter approximates in length the desired outer perimeter of the finished carbon body, the mandrel having a perimeter approximating in length the desired inner perimeter of the finished carbon body, and the cloth having a width substantially greater than the desired axial thickness of the finished carbon body.

Claim 39

Dependent Claim 31 words

The process of claim 3, wherein the ratio of the width of carbon cloth to the desired axial thickness of the finished carbon body ranges from about 1.25:1 to about 3:1.

Claim 40

Dependent Claim 9 words

INTRODUCING A CARBONIZABLE BINDER BETWEEN THE CARBON FIBERS; AND

Claim 41

Dependent Claim 9 words

INTRODUCING A CARBONIZABLE BINDER BETWEEN THE CARBON FIBERS; AND

Claim 42

Dependent Claim 9 words

introducing a carbonizable binder between the carbon fibers; and

Claim 43

Dependent Claim 9 words

introducing a carbonizable binder between the carbon fibers; and

Claim 44

Dependent Claim 39 words

the mold has an inner perimeter conforming substantially to the desired size and shape of the inner perimeter of the desired carbon body, said mold inner perimeter forming, with the compression plates and mold outer perimeter, a mold cavity.

Claim 45

Dependent Claim 39 words

the mold has an inner perimeter conforming substantially to the desired size and shape of the inner perimeter of the desired carbon body, said mold inner perimeter forming, with the compression plates and mold outer perimeter, a mold cavity.

Claim 46

Dependent Claim 39 words

the carbonizable binder is cured, after each impregnation and after each reimpregnation, at a temperature of at least about 125*C and a pressure of at least about 6 kilograms per square centimeter, maintained for at least about 8 hours;

Claim 47

Dependent Claim 39 words

the carbonizable binder is cured, after each impregnation and after each reimpregnation, at a temperature of at least about 125*C and a pressure of at least about 6 kilograms per square centimeter, maintained for at least about 8 hours;

Claim 48

Dependent Claim 47 words

the mold has an inner perimeter conforming substantially to the desired size and shape of the inner perimeter of the desired carbon body, said mold inner perimeter forming, with the compression plates and mold outer perimeter, a mold cavity for each carbon body to be simultaneously produced.

Claim 49

Dependent Claim 47 words

the mold has an inner perimeter conforming substantially to the desired size and shape of the inner perimeter of the desired carbon body, said mold inner perimeter forming, with the compression plates and mold outer perimeter, a mold cavity for each carbon body to be simultaneously produced.

Claim 50

Dependent Claim 17 words

placing the compressed, impregnated assembly of carbon fibers under pressure and temperature to cure the carbonizable binder;

Claim 51

Dependent Claim 17 words

placing the compressed, impregnated assembly of carbon fibers under pressure and temperature to cure the carbonizable binder;

Claim 52

Dependent Claim 9 words

introducing a carbonizable binder between the carbon fibers; and

Claim 53

Dependent Claim 9 words

introducing a carbonizable binder between the carbon fibers; and

Claim 54

Dependent Claim 80 words

the cured binder is carbonized after the curing following each impregnation and each reimpregnation, by baking the assembly of carbon fibers containing cured binder in a protective atmosphere, raising the temperature of the assembly at a rate of at most 5 centigrade degrees per hour until a temperature of about 450*C is attained, then raising the temperature of the assembly at a rate of at most 20 centigrade degrees per hour until a temperature of about 800*C is attained; and

Claim 55

Dependent Claim 80 words

the cured binder is carbonized after the curing following each impregnation and each reimpregnation, by baking the assembly of carbon fibers containing cured binder in a protective atmosphere, raising the temperature of the assembly at a rate of at most 5 centigrade degrees per hour until a temperature of about 450*C is attained, then raising the temperature of the assembly at a rate of at most 20 centigrade degrees per hour until a temperature of about 800*C is attained; and

Claim 56

Dependent Claim 19 words

baking the assembly of carbon fibers containing cured binder in a protective atmosphere to carbonize the cured binder; and

Claim 57

Dependent Claim 19 words

baking the assembly of carbon fibers containing cured binder in a protective atmosphere to carbonize the cured binder; and

Claim 58

Dependent Claim 16 words

carbonizing the carbonizable binder, whereby to form a carbon matrix binding together the reinforcing carbon fibers.

Claim 59

Dependent Claim 16 words

carbonizing the carbonizable binder, whereby to form a carbon matrix binding together the reinforcing carbon fibers.

Claim 60

Dependent Claim 16 words

CARBONIZING THE CARBONIZABLE BINDER, WHEREBY TO FORM A CARBON MATRIX BINDING TOGETHER THE REINFORCING CARBON FIBERS.

Claim 61

Dependent Claim 16 words

CARBONIZING THE CARBONIZABLE BINDER, WHEREBY TO FORM A CARBON MATRIX BINDING TOGETHER THE REINFORCING CARBON FIBERS.

Claim 62

Dependent Claim 27 words

The process of claim 3, wherein the ratio of the width of carbon cloth to the desired axial thickness of the finished carbon body is about 2:1.

Claim 63

Dependent Claim 74 words

The process of claim 2, wherein the annular assembly of loosely wound carbon fibers is prepared by winding unwoven carbon yarn loosely about a mandrel until the outer perimeter approximates in length the desired outer perimeter of the finished carbon body and tHe width is substantially greater than the desired axial thickness of the finished carbon body, the mandrel having a perimeter approximating in length the desired inner perimeter of the finished carbon body.

Claim 64

Dependent Claim 16 words

carbonizing the carbonizable binder, whereby to form a carbon matrix binding together the reinforcing carbon fibers.

Claim 65

Dependent Claim 16 words

carbonizing the carbonizable binder, whereby to form a carbon matrix binding together the reinforcing carbon fibers.

Claim 66

Dependent Claim 30 words

after the assembly is first baked, but prior to the last cycle of partial vacuum, impregnation, curing and carbonizing operations, the temperature of the assembly is raised to about 1500*C.

Claim 67

Dependent Claim 30 words

after the assembly is first baked, but prior to the last cycle of partial vacuum, impregnation, curing and carbonizing operations, the temperature of the assembly is raised to about 1500*C.

Claim 68

Dependent Claim 86 words

subjecting the baked assembly to at least one additional cycle of partial vacuum, impregnation, curing and carbonizing operations, each cycle comprising a. subjecting the baked assembly to a partial vacuum, the absolute pressure of said partial vacuum being less than about 100 mm Hg; b. reimpregnating the baked assembly with heatcurable carbonizable binder; c. placing the reimpregnated assembly of carbon fibers under pressure and temperature to cure the carbonizable binder; and d. baking the cured reimpregnated assembly in a protective atmosphere to carbonize the cured binder.

Claim 69

Dependent Claim 86 words

subjecting the baked assembly to at least one additional cycle of partial vacuum, impregnation, curing and carbonizing operations, each cycle comprising a. subjecting the baked assembly to a partial vacuum, the absolute pressure of said partial vacuum being less than about 100 mm Hg; b. reimpregnating the baked assembly with heatcurable carbonizable binder; c. placing the reimpregnated assembly of carbon fibers under pressure and temperature to cure the carbonizable binder; and d. baking the cured reimpregnated assembly in a protective atmosphere to carbonize the cured binder.

Claim 70

Dependent Claim 35 words

The process of claim 6, wherein the ratio of the width of the loosely wound unwoven carbon yarn to the desired axial thickness of the finished carbon body ranges from about 1.25:1 to about 3:

Claim 71

Dependent Claim 31 words

The process of claim 6, wherein the ratio of the width of the loosely wound unwoven carbon yarn to the desired axial thickness of the finished carbon body is about 2:1.

Claim 72

Dependent Claim 40 words

The process of claim 1, wherein the looseness of the loosely wound carbon fibers is enhanced by the use of temporary spacers, inserted among the carbon fibers during winding, and removed prior to axially compressing the fibers within the mold.

Claim 73

Dependent Claim 43 words

The process of claim 9, wherein the desired carbon body has a circumferentially nonuniform radial depth, and wherein the temporary spacers comprise spacers placed in portions of the carbon fiber assembly corresponding to locations of lesser radial depth of the desired carbon body.

Claim 74

Dependent Claim 50 words

The process of claim 1, wherein the assembly of loosely wound carbon fibers is compressed to a fiber density of from about 0.6 to about 1.2 grams per cubic centimeter, and said compressed carbon fibers constitute from about 40 to about 90 percent by volume of the finished carbon body.

Claim 75

Dependent Claim 50 words

The process of claim 1, wherein the assembly of loosely wound carbon fibers is compressed to a fiber density of from about 0.8 to about 0.95 grams per cubic centimeter, and said compressed carbon fibers constitute from about 60 to about 70 percent by volume of the finished carbon body.

Claim 76

Dependent Claim 6 words

The process of claim 1, wherein

Claim 77

Dependent Claim 30 words

The process of claim 13, wherein the fiber density is balanced by inserting supplemental carbon between circumferential windings of the circumferentially wound reinforcing fibers in location of greater radial depth.

Claim 78

Dependent Claim 29 words

The process of claim 13, wherein the fiber density is balanced by positioning supplemental carbon adjacent to the circumferentially wound carbon reinforcing fibers, in locations of greater radial depth.

Claim 79

Dependent Claim 36 words

The process of claim 15, wherein the carbon body is produced in the form of a brake disc, and the supplemental carbon is positioned in locations to be subjected to frictional contact with adjacent brake discs.

Claim 80

Dependent Claim 24 words

The process of claim 16, wherein particulate ditungsten monoboride is interspersed between layers of carbon cloth positioned adjacent the circumferentially wound carbon reinforcing fibers.

Claim 81

Dependent Claim 29 words

The process of claim 17, wherein said particulate ditungsten monoboride is applied in an amount of from about 0.25 to about 5 percent, by volume of the supplemental carbon.

Claim 82

Dependent Claim 29 words

The process of claim 18, wherein in addition particulate elemental boron is applied to the reinforcing carbon fibers in locations not to be subjected to friction with adjacent discs.

Claim 83

Dependent Claim 20 words

The process of claim 1, wherein circumferentially even distribution of reinforcing carbon fibers within the carbon body is facilitated by

Claim 84

Dependent Claim 12 words

The process of claim 20, wherein said marking means comprises paraffin wax.

Claim 85

Dependent Claim 41 words

The process of claim 1, wherein the assembly of reinforcing carbon fibers is placed in the mold free of any binder, aNd the steps of introducing the carbonizable binder between the carbon fibers and carbonizing the carbonizable binder are accomplished by

Claim 86

Dependent Claim 6 words

The process of claim 22, wherein

Claim 87

Dependent Claim 151 words

The process of claim 1, wherein a plurality of carbon bodies having essentially the same perimeters are produced simultaneously in the same mold, said mold comprising a. an outer perimeter conforming substantially to the desired size and shape of the outer perimeter of the desired carbon bodies; and b. a number of compression plates, said number of compression plates being one in excess of the number of carbon bodies to be produced; said plates having mutually opposed pairs of faces which conform substantially to the desired sizes and shapes of the faces of the carbon bodies; said plates being coaxially aligned with each other and with the mold outer perimeter, and forming with said mold outer perimeter, a mold cavity for each carbon body to be simultaneously produced, the distances between said plates being variable by axial movement; an assembly of loosely wound carbon fibers being placed within each mold cavity.

Claim 88

Dependent Claim 6 words

The process of claim 24 wherein

Claim 89

Dependent Claim 46 words

A process for producing a reinforced carbon body having a shape comprising two opposite faces and an outer perimeter provided with indentations adapted to bear circumferential stress, each face adjoining the outer perimeter, said carbon body having a circumferentially nonuniform radial depth, comprising the steps of

Claim 90

Dependent Claim 46 words

A process for producing a reinforced carbon body having a shape comprising two opposite faces and an outer perimeter provided with indentations adapted to bear circumferential stress, each face adjoining the outer perimeter, said carbon body having a circumferentially nonuniform radial depth, comprising the steps of

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-02-17	1978-08-19	1979-02-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-02-17	1982-08-19	1983-02-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-02-17	1986-08-19	1987-02-18	$7700.00	Window Closed / Lapsed

Process for reinforced carbon bodies

Abstract

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