US4943334A — Method for making reinforced plastic laminates fo…

Claim 1

Independent Claim 166 words

In a method for making a printed circuit board of a set of filament sections embedded in and bonded to a continuous phase of settable matrix material, the steps comprising, prior to setting or curing of such settable matrix material which holds the entire set of filament sections in fixed spatial relationship, forming at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; and arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; said filament sections being held on a form in fixed spatial relationship.

Claim 2

Dependent Claim 166 words

In a method for making a printed circuit board of a set of filament sections embedded in and bonded to a continuous phase of settable matrix material, the steps comprising, prior to setting or curing of such settable matrix material which holds the entire set of filament sections in fixed spatial relationship, forming at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; and arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; said filament sections being held on a form in fixed spatial relationship.

Claim 3

Dependent Claim 28 words

A method as claimed in claim 1 wherein all the filament sections in each layer are substantially parallel to each other, and said angle is substantially ninety degrees.

Claim 4

Dependent Claim 40 words

A method as claimed in claim 1 or 2 which further comprises winding the filament sections of each layer unidirectionally around a flat form at a tension sufficient to provide a uniform arrangement of the filament sections in each layer.

Claim 5

Dependent Claim 59 words

A method as claimed in claim 3 wherein the flat form is made to include a section in right quadrilateral shape and alternate layers are respectively wound in criss-cross directions on said form and are wound so that the number and character of filament sections in the respective directions provides substantially equal mechanical and thermal properties in such directions.

Claim 6

Dependent Claim 188 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix, the steps comprising forming at least one set of filament sections on a form as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set, and arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension on said form, wherein the filament sections are electrically non-conductive; and introducing a continuous settable matrix of electrically non-conductive material which, after setting, fixes the filament sections in position, the tension in the filament sections at the setting of the matrix being the minimum necessary to maintain alignment of the filament sections, wherein the filament sections are embedded in said matrix.

Claim 7

Dependent Claim 188 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix, the steps comprising forming at least one set of filament sections on a form as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set, and arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension on said form, wherein the filament sections are electrically non-conductive; and introducing a continuous settable matrix of electrically non-conductive material which, after setting, fixes the filament sections in position, the tension in the filament sections at the setting of the matrix being the minimum necessary to maintain alignment of the filament sections, wherein the filament sections are embedded in said matrix.

Claim 8

Dependent Claim 39 words

A method as claimed in claim 3 wherein the filament sections are embedded in a curable matrix of electrically non-conductive material which fixes the filament sections in position, and forming the matrix between said form and an outer plate.

Claim 9

Dependent Claim 15 words

A method as claimed in claim 1 wherein said layers are arranged in parallel planes.

Claim 10

Dependent Claim 63 words

A method as claimed in claim 3 wherein said form has opposite sides connected by edges and wherein sets are formed on opposite sides of the form, said filament arrangement being brought from one side to the other of said form by traversing said edges, said method including separating the sets by trimming the wound filament arrangement at the edges of the form.

Claim 11

Dependent Claim 30 words

A method as claimed in claim 3 wherein each filament arrangement is wetted, during the winding on the form, with a resin which is subsequently cured to form said matrix.

Claim 12

Dependent Claim 32 words

A method as claimed in claim 3 wherein each filament arrangement is completely wetted, subsequent to the winding on the form, with a resin which is subsequently cured to form said matrix.

Claim 13

Dependent Claim 17 words

A method as claimed in claim 3 wherein the filament sections are formed as bundles of filaments.

Claim 14

Dependent Claim 18 words

A method as claimed in claim 8 wherein the filament sections are helically wound by rotating the form.

Claim 15

Dependent Claim 27 words

A method as claimed in claim 8 wherein the filament sections are helically wound by revolving at least one planetary source of filament sections about said form.

Claim 16

Dependent Claim 33 words

A method as claimed in claim 8 wherein an angle between the form and the filament sections is controlled by relatively displacing the form and at least one source of the filament sections.

Claim 17

Dependent Claim 24 words

A method as claimed in claim 5 including forming a plurality of such sets and stacking the same to form said printed circuit board.

Claim 18

Dependent Claim 21 words

A method as claimed in claim 5 comprising forming a conductive surface or circuit on at least one of said layers.

Claim 19

Dependent Claim 28 words

A method as claimed in claim 1 wherein said filament sections are of a material selected from the group consisting of fiberglass, quartz, aramid, carbon, polyester and nylon.

Claim 20

Dependent Claim 13 words

A method as claimed in claim 5 wherein the matrix is a resin.

Claim 21

Dependent Claim 27 words

A method as claimed in claim 17 wherein the resin is selected from the group consisting of epoxy, polyimide, polyester, bismaleimide, vinyl ester, phenolic, melamine and polybutadiene.

Claim 22

Dependent Claim 156 words

In a method for making a printed circuit board of a set of filament sections in a continuous settable matrix, the steps comprising winding at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; and maintaining substantially constant tension in the filament sections while winding said sections around a form such that all filament sections in each layer are substantially parallel and at the same tension.

Claim 23

Dependent Claim 156 words

In a method for making a printed circuit board of a set of filament sections in a continuous settable matrix, the steps comprising winding at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; and maintaining substantially constant tension in the filament sections while winding said sections around a form such that all filament sections in each layer are substantially parallel and at the same tension.

Claim 24

Dependent Claim 23 words

A method as claimed in claim 8 comprising bordering said form with disposable edges which are removed when the filament arrangement is trimmed.

Claim 25

Dependent Claim 21 words

A method as claimed in claim 3 comprising controlling the pitch of the helically wound arrangement by controllably displacing said form.

Claim 26

Dependent Claim 18 words

A method as claimed in claim 1 comprising arranging an equal number of filament sections in each layer.

Claim 27

Dependent Claim 43 words

A method as claimed in claim 1 wherein the layers have respective X and Y directions which are perpendicular to each other and are arranged such that the resulting composite has an equal flexural modulus of elasticity in the X and Y directions.

Claim 28

Dependent Claim 31 words

A method as claimed in claim 5 wherein the matrix is of a curable substance and curing of said substance with the filament sections therein is effected under substantially atmospheric pressure.

Claim 29

Dependent Claim 45 words

A method as claimed in claim 5 which comprises forming a conductive surface on said composite by providing a metal on at least one side of one of the flat surfaces between which the matrix is formed, and transferring the metal to the adjacent matrix.

Claim 30

Dependent Claim 44 words

A method as claimed in claim 16 wherein the conductive surface is formed by providing a metal foil on at least one side of one of the flat surfaces between which the matrix is formed the metal being transferred to the immediately adjacent matrix.

Claim 31

Dependent Claim 41 words

A method as claimed in claim 26 wherein the conductive surface is formed by providing metal foil in the configuration of a circuit on at least one side of one said surface and transferring the circuit to the immediately adjacent matrix.

Claim 32

Dependent Claim 19 words

A method as claimed in claim 26 wherein the conductive surface is formed of metal which is subsequently burnished.

Claim 33

Dependent Claim 22 words

A method as claimed in claim 26 wherein the conductive surface is formed of metal which is ground to a predetermined thickness.

Claim 34

Dependent Claim 42 words

A method as claimed in claim 5 or 6 comprising forming outside surfaces on said matrix on opposite sides of the plane of symmetry, the surfaces being formed by said form on one side and by a flat surface on the other.

Claim 35

Dependent Claim 44 words

A method as claimed in claim 5 or 6 wherein the flat plate is brought into contact with the matrix after the filament sections have been vacuum impregnated with a curable resin constituting the matrix and while the resin is still under vacuum conditions.

Claim 36

Dependent Claim 27 words

A method as claimed in claim 31 wherein the spacing between the form and the flate plates is set to control the desired thickness of the composite.

Claim 37

Dependent Claim 30 words

A method as claimed in claim 33 wherein said spacing is set by spacers located in areas of both said form and flat plate wherein no filament sections are located.

Claim 38

Dependent Claim 18 words

A method as claimed in claim 33 wherein said spacing is set by spacers supported on the plate.

Claim 39

Dependent Claim 15 words

A method as claimed in claim 33 wherein the spacers are supported on the form.

Claim 40

Dependent Claim 45 words

A method as claimed in claim 5 or 20 wherein the layers have respective X and Y directions which are perpendicular to each other and are arranged such that the resulting composite has an equal flexural modulus of elasticity in the X and Y directions.

Claim 41

Dependent Claim 175 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix, the steps comprising forming by winding on a flat mandrel at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; introducing a settable matrix capable of bonding to said filament sections; and curing the matrix by electromagnetic radiation wherein an outer plate constitutes one electrical pole for such radiation, the mandrel constitutes the other electrical pole therefor, and the matrix constitutes the dielectric between the poles.

Claim 42

Dependent Claim 175 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix, the steps comprising forming by winding on a flat mandrel at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; introducing a settable matrix capable of bonding to said filament sections; and curing the matrix by electromagnetic radiation wherein an outer plate constitutes one electrical pole for such radiation, the mandrel constitutes the other electrical pole therefor, and the matrix constitutes the dielectric between the poles.

Claim 43

Dependent Claim 60 words

A method as claimed in claim 3 wherein the flat form is made to include a section in a right quadrilateral shape and alternate layers and respectively wound in criss-cross directions on said form, including the step of winding the layers with a density of filament sections in the respective directions corresponding to the desired elastic modulus in such directions.

Claim 44

Dependent Claim 37 words

A method as claimed in claim 3 wherein the pitch of the wind is greater than the width of the filament bundles being wound, whereby a pattern of spaces is provided in the laminate free of filaments.

Claim 45

Independent Claim 250 words

A method for making a composite of a set of filament sections in a settable resin matrix, comprising forming at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set, and arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; including the steps of subjecting said set of filament sections to a vacuum; injecting a settable resin into the set of filament sections in an amount sufficient to enclose the entire set; supporting said set and resin within mold surfaces capable of holding the filament sections in their respective orientations; wherein the tension in the filament sections at gelation temperatures is at a value such that when reduced to ambient temperature the stresses induced by resin shrinkage, filament tension and the expansion or contraction of both due to temperature reach an equilibrium so that the net stress in the composite is not greater than the critical buckling stress; removing the set of filament sections and resin, within such mold surfaces, from vacuum; and curing the resin to a hardened condition.

Claim 46

Independent Claim 250 words

A method for making a composite of a set of filament sections in a settable resin matrix, comprising forming at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set, and arranging said layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; including the steps of subjecting said set of filament sections to a vacuum; injecting a settable resin into the set of filament sections in an amount sufficient to enclose the entire set; supporting said set and resin within mold surfaces capable of holding the filament sections in their respective orientations; wherein the tension in the filament sections at gelation temperatures is at a value such that when reduced to ambient temperature the stresses induced by resin shrinkage, filament tension and the expansion or contraction of both due to temperature reach an equilibrium so that the net stress in the composite is not greater than the critical buckling stress; removing the set of filament sections and resin, within such mold surfaces, from vacuum; and curing the resin to a hardened condition.

Claim 47

Dependent Claim 62 words

A method as claimed in claim 41 wherein the filament sections are formed by winding about a form under substantially constant tension sufficient to assure uniform lay-down of the filament sections within each layer, the molding surfaces have a flatness corresponding to the desired flatness of the finished composite, and the spacing of such molding surfaces is determined by spacers between them.

Claim 48

Dependent Claim 163 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix material, the steps comprising forming at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; and arranging such layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; said filament sections being formed, arranged and held on a form in fixed spatial relationship prior to the introduction of a settable matrix material in a continuous phase which bonds to the filaments thereof to form said composite.

Claim 49

Dependent Claim 163 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix material, the steps comprising forming at least one set of filament sections as a plurality of superposed layers of filament sections with the filament sections in each layer being arranged generally in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set; and arranging such layers in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; said filament sections being formed, arranged and held on a form in fixed spatial relationship prior to the introduction of a settable matrix material in a continuous phase which bonds to the filaments thereof to form said composite.

Claim 50

Dependent Claim 44 words

A method as claimed in claim 1, 20 or 43 which includes the step of forming a continuous phase of said matrix material to define outer surfaces having a flatness and surface finish sufficient for use as the surfaces of a printed circuit board.

Claim 51

Dependent Claim 67 words

A method as claimed in claim 1, 20, 41 or 43 wherein the filament sections in each layer are substantially parallel to each other, said angle is substantially ninety degrees, and the filament sections of each layer are parts of a filament arrangement unidirectionally and helically wound around a flat form, said tension being sufficient to provide a uniform arrangement of the filament sections in each layer.

Claim 52

Dependent Claim 65 words

A method as claimed in claim 1, 20, 41 or 43 wherein the filament sections in each layer are substantially parallel to each other, said angle is substantially ninety degrees, and the filament sections of each layer are parts of a filament arrangement circumferentially wound around a flat form, said tension being sufficient to provide a uniform arrangement of the filament sections in each layer.

Claim 53

Dependent Claim 75 words

A method as claimed in claim 1, 20, 41 or 43 wherein the matrix has X and Y directions along the respective filaments which are perpendicular to each other and which further comprises constructing the printed circuit board to provide thermal coefficients of expansion which are essentially the same in the X and Y directions, and to provide section modulus of elasticity values for the filaments which are tailored in the X and Y directions.

Claim 54

Dependent Claim 30 words

A method as claimed in claim 47 which further comprises tailoring the sections modulus of elasticity values in the X and Y directions to values which are substantially the same.

Claim 55

Dependent Claim 24 words

A method as claimed in claim 1 or 43 further comprising introducing a settable matrix which, after setting, fixes the filament sections in position.

Claim 56

Dependent Claim 31 words

A method as claimed in claim 49 wherein the superposed layers of filament sections are arranged to provide at least one passage through the printed circuit board free of filament sections.

Claim 57

Dependent Claim 25 words

A method as claimed in claim 50 further comprising forming a hole through said at least one passage after setting and curing of the matrix.

Claim 58

Dependent Claim 27 words

A method as claimed in claim 49 further comprising forming an electrically conductive circuit on at least one outer surface of said matrix and through said hole.

Claim 59

Dependent Claim 26 words

A method as claimed in claim 49 further comprising cutting said, printed circuit board in quadrilateral form having side edges generally perpendicular to the filament sections.

Claim 60

Dependent Claim 236 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix, the steps comprising forming a filamentary structure of at least one set of filament sections on a form as a plurality of superposed layers of filament sections with the filament sections in each layer being in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set, and arranging said layers of said filamentary structure in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; and impregnating said filamentary structure with a settable matrix material to form said printed circuit board by the steps of: supporting such filamentary structure between at least two surfaces each having a flatness and finish corresponding to the flatness and finish of the desired printed circuit board; subjecting the supported filamentary structure to a vacuum; introducing a settable matrix material into the filamentary structure in an amount sufficient to fill the desired volume of the printed circuit board; spacing the surfaces apart a distance corresponding to the desired dimension of such printed circuit board; and curing the matrix material to the desired hardness.

Claim 61

Dependent Claim 236 words

In a method for making a printed circuit board of a set of filament sections in a settable matrix, the steps comprising forming a filamentary structure of at least one set of filament sections on a form as a plurality of superposed layers of filament sections with the filament sections in each layer being in the same direction and with the direction of the filament sections in at least one layer in such set being arranged at an angle to the direction of the filament sections in other layers in such set, and arranging said layers of said filamentary structure in mirror image relationship relative to a plane of symmetry parallel to the layers of the set, all of the filament sections aligned generally in the same direction being under the same tension; and impregnating said filamentary structure with a settable matrix material to form said printed circuit board by the steps of: supporting such filamentary structure between at least two surfaces each having a flatness and finish corresponding to the flatness and finish of the desired printed circuit board; subjecting the supported filamentary structure to a vacuum; introducing a settable matrix material into the filamentary structure in an amount sufficient to fill the desired volume of the printed circuit board; spacing the surfaces apart a distance corresponding to the desired dimension of such printed circuit board; and curing the matrix material to the desired hardness.

Claim 62

Dependent Claim 23 words

A method as claimed in claim 54 wherein the filamentary structure is subjected to vacuum prior to introduction of said settable matrix material.

Claim 63

Dependent Claim 21 words

A method as claimed in claim 54 further comprising restoring pressure at least to ambient conditions prior to the curing step.

Claim 64

Dependent Claim 28 words

A method as claimed in claim 54 wherein the resin is introduced prior to the spacing of the surfaces to the desired dimension of the printed circuit board.

Claim 65

Dependent Claim 29 words

A method as claimed in claim 54 wherein the filamentary structure includes a layer of cloth, and the matrix material is introduced while the filamentary structure is under vacuum.

Claim 66

Dependent Claim 35 words

A method as claimed in claim 54 wherein the filament sections are electrically non-conductive and are embodied in a continuous settable matrix of electrically non-conductive material which fixes the filament sections in position after curing.

Claim 67

Dependent Claim 29 words

A method as claimed in claim 54 wherein the settable matrix material is introduced into the filamentary structure in a manner to provide a void-free matrix after curing thereof.

Claim 68

Dependent Claim 35 words

A method as claimed in claim 54 which further comprises forming outer surfaces of said matrix with a flatness and surface finish which are suitable for use as the surfaces of a printed circuit board.

Claim 69

Dependent Claim 29 words

A method as claimed in claim 43 wherein the matrix material is a first resin and futher comprises introducing an additional resin which is compatible with said first resin.

Claim 70

Dependent Claim 15 words

A method as claimed in claim 18 wherein said resin includes one or more fillers.

Claim 71

Dependent Claim 23 words

A method as claimed in claim 54 which further comprises placing a core between said surfaces prior to introducing said settable matrix material.

Claim 72

Dependent Claim 14 words

A method as claimed in claim 64 wherein the core is made of metal.

Claim 73

Dependent Claim 47 words

A method as claimed in claim 1 or 43 wherein the matrix material is a first resin and which further comprises impregnating the filament sections with a solvent solution of said resin during winding; and flashing off the solvent prior to setting and curing of the resin.

Claim 74

Dependent Claim 45 words

A method as claimed in claim 1 wherein the matrix material is a first resin and which further comprises impregnating the filament sections with a solvent solution of said resin before winding; and flashing off the solvent prior to setting and curing of the resin.

Claim 75

Dependent Claim 23 words

A method as claimed in claim 66 or 67 which further comprises introducing an additional resin which is compatible with said first resin.

Claim 76

Dependent Claim 237 words

In a method for making printed circuit boards of a set of filament sections in a continuous settable matrix; comprising winding at least one filament continuously around a right quadrilateral flat form to form a set of filament sections as a plurality of superposed layers of filament sections on each side of the form, with the filament sections in each layer being arranged generally in the same direction and under the same tension, with the direction of the filament sections in at least one layer in each set being arranged perpendicular to the direction of the filament sections in other layers in such set; each said set being wound such that said layers are in mirror image relationship relative to a central plane of symmetry parallel to the layers of the set; impregnating at least one of said sets with a settable, electrically non-conductive material to form a solid matrix for said sets with the tension in the filament sections at gelation temperatures being at a value such that when reduced to ambient temperature the stresses induced by matrix shrinkage, filament tension and the expansion or contraction of both due to temperature reach an equilibrium so that the net stress in the circuit board is not greater than the critical buckling stress of the printed circuit board; and separating said sets by trimming the wound filament arrangement at edges of the flat form to form the boards.

Claim 77

Dependent Claim 237 words

In a method for making printed circuit boards of a set of filament sections in a continuous settable matrix; comprising winding at least one filament continuously around a right quadrilateral flat form to form a set of filament sections as a plurality of superposed layers of filament sections on each side of the form, with the filament sections in each layer being arranged generally in the same direction and under the same tension, with the direction of the filament sections in at least one layer in each set being arranged perpendicular to the direction of the filament sections in other layers in such set; each said set being wound such that said layers are in mirror image relationship relative to a central plane of symmetry parallel to the layers of the set; impregnating at least one of said sets with a settable, electrically non-conductive material to form a solid matrix for said sets with the tension in the filament sections at gelation temperatures being at a value such that when reduced to ambient temperature the stresses induced by matrix shrinkage, filament tension and the expansion or contraction of both due to temperature reach an equilibrium so that the net stress in the circuit board is not greater than the critical buckling stress of the printed circuit board; and separating said sets by trimming the wound filament arrangement at edges of the flat form to form the boards.

Claim 78

Dependent Claim 23 words

A method as claimed in claim 69 further comprising forming an electrically conductive circuit on at least one outer surface of said matrix.

Claim 79

Dependent Claim 31 words

A method as claimed in claim 70 wherein the superposed layers of filament sections are arranged to provide at least one passage through the printed circuit board free of filament sections.

Claim 80

Dependent Claim 25 words

A method as claimed in claim 71 further comprising forming a hole through said at last one passage after setting and curing of the matrix.

Claim 81

Dependent Claim 19 words

A method as claimed in claim 72 wherein a portion of said electrically conductive circuit extends through said hole.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-07-23	1994-01-22	1994-07-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-07-23	1998-01-22	1998-07-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-07-23	2002-01-22	2002-07-24	$7700.00	Window Closed / Lapsed

Method for making reinforced plastic laminates for use in the production of circuit boards

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