Abstract: A coating which does not reduce the strength of a glass pane and consists of an aluminum phosphate binder in combination with a flake or platelet inorganic pigment is screen-printed on the glass and burned into the latter. The coating can be made conductive by incorporating graphite and/or carbon black therein.

Abstract: A decorative pleatable material adapted for the fabrication of pleated shades is described. The material is comprised of a pleatable fabric having a decorative resin coat containing desired pigment adhered to the face of the fabric by means of a polyurethane layer embedded in the structure of the fabric. The decorative resin coat is overlaid with a top-coat that prevents blocking during pleating. A preferred top-coat is comprised of a film forming cellulose derivative containing amorphous fumed silica. A film transfer strip for producing the decorative pleatable material is also described.

Abstract: An electrical multilayer component comprising a sintered monolithic body and a method for the manufacture of the component.The sintered monolithic ceramic body of the electrical multilayer component includes cavities which alternate between layers, and are open toward end faces which are on opposite sides. The cavities also open toward lateral surfaces of the ceramic body over their entire lengths. The cavities contain ceramic particles which are distributed therethrough to act as supporting elements and are completely filled with a metal or metal alloy whose melting temperature is considerably lower than the sintering temperature of the ceramic body. The metal or alloy has the property of wetting the surfaces of the ceramic layers in the cavities in the molten condition. Contact elements are then applied to the end faces, the contact elements being impervious to the metal melt. Spaces free of metal are present in the cavities at the lateral surfaces of the ceramic body.

Abstract: The invention relates to a printed wiring board (7) which includes at least one carbon resistor (3) formed across terminals (2a, 2b) of printed wiring circuit (2). A heat dissipating film layer (4) is formed at least on the carbon resistor (3). Thus, heat produced in the resistor (3) is effectively dissipated.

Abstract: Optically-readable identification means embedded in an article to be identified. One method of the invention is to apply the identification means to an article and then subsequently cover the article, at least in the area of the identification means, with a protective layer so that the identification means becomes an integral part of the article. In the case of fiberglass articles, the identification means is applied to the article before the final layer of epoxy or polyester is applied. In one preferred embodiment for high temperature applications, there is provided an embeddable bar code strip comprising a bar code which can withstand high temperatures disposesd on a polymeric carrier substrate which is stable at temperatures to at about 500 degrees Fahrenheit. This bar code is preferably iron powder placed on a polyimide substrate by means of xerographic copying. In another preferred embodiment, for nonreflective articles, one surface of the carrier substrate is coated with aluminum by vapor deposition.

Abstract: Decorative laminate having improved resistance against marring, abrasion, staining and crocking, and method for the preparation thereof, the laminate comprising a substrate and a decorative sheet, the decorative sheet having on the exposed surface a layer consisting essentially of a thermoset resin, substantially fully hydrolyzed polyvinyl alcohol, fumed amorphous silica, and particulate abrasive material having a hardness higher than that of silica. Abrasion resistance greater than 3000 cycles (NEMA Wear) by the NEMA test LD 3-3.01 is obtained in combination with improved mar resistance.

Abstract: An article having a surface comprising an olefin polymer is marked with indicia using an ink comprising a binder capable of substantially complete cure at a temperature of about 100.degree. to 300.degree. C. for less than about 10 minutes and then heated to cure the binder. The indicia are permanent, e.g. are resistant to being rubbed off and are solvent resistant. Heat-recoverable marker sleeves having such permanent indicia are particularly useful for marking wires, e.g. in aircraft harnessing.

Abstract: A family of synthetic alkali metal aluminosilicates (SAMS) are produced by the hydrothermal reaction between kaolin clay and alkali metal silicates. The integrated composition of the SAMS products is a unique entity having an overall composition ofxM.sub.2 O:Al.sub.2 O.sub.3 :ySiO.sub.2.zH.sub.2 Owhere x is the number of moles of alkali metal oxide and is an integer from 0.01 to 2.0, M is an alkali metal, y is the number of moles of SiO.sub.2 in the unique SAMS compsoition, and z is the number of moles of bound water and is an integer ranging from 1.0 to 5.0. The composition essentially comprises altered kaolin clay platelets with an integral rim or protuberance of essentially amorphous alkali metal silicate-kaolin reaction product. The unique SAMS compositions are structured materials in which the structure can be controlled, and are therefore useful as functional fillers, as TiO.sub.2 extenders, as silica extenders or as reinforcing agents for paper, paint, rubber, plastics and specialty products.

Abstract: A decorative surface covering has a transparent or translucent layer containing a plately material that is reoriented at two or more different angles with respect to the surface of the layer to provide a three-dimensional effect to the decorative surface covering. The covering can be chemically embossed to further enhance the three-dimensional effect. Portions of the layer containing the platey material can be masked to produce an inlaid or inset effect.

Abstract: There is provided a novel marble-translucent thin resilient decorative sheet 1, which comprises thin permeable pulp paper 2, fine whitish inorganic filler powder, and a substantially transparent cured resin contained by impregnation throughout the pulp paper, said filler powder being uniformly deposited onto at least the top surface of the pulp paper and being firmly fixed thereto. The decorative sheet is produced by impregnating fine whitish inorganic filler-loaded permeable pulp paper with a liquid polymerizable resinous composition for forming a substantially transparent cured resin, placing the impregnated pulp paper between molding plates, and polymerizing the resinous composition into a cured resin; or by impregnating permeable non-loaded pulp paper containing no filler powder with the liquid resinous composition containing fine whitish inorganic filler powder and carrying out the polymerization between molding plates as described above.

Abstract: An aromatic polyimide film containing very fine particles of an inert inorganic material having an average particle diameter of 40 to 1,000 angstroms in an amount of 0.02 to 6.0 wt. %, wherein a surface of the film is provided with extremely small sized protrusions having a maximum height of 50 to 500 angstroms and an average diameter of 50 to 2,000 angstroms, the number of protrusions is in the range of 2.times.10.sup.5 to 1.times.10.sup.8 /mm.sup.2, and the number of protrusions having a diameter of not less than 1.5 times as much as the average diameter is not more than 5% of the total number of the protrusions. This polyimide film is suitably employable as a support of a magnetic recording medium.

Abstract: A thermosensitive image transfer recording medium comprising a support material; an image transfer layer formed on the support material, comprising a fine porous network structure made of a resin comprising cellulose acetate butyrate; a non-volatile oily material which is contained in the fine porous network structure, and which does not dissolve the resin of the fine porous network structure; and a thermofusible ink composition which is held in the fine porous network structure, comprising (a) a thermofusible wax material is solid at room temperature, and (b) a colorant.

Abstract: A flexible decorative sheet material for use in surfacing automobile body panels and the like is disclosed. The sheet material is characterized by having the appearance of a base coat/clear coat paint finish. The material comprises a substantially transparent outer layer, and a pigmented coating on the undersurface of the outer layer which is visible therethrough. The pigmented coating preferably has reflective flakes uniformly distributed therein to impart to the sheet material the appearance of a base coat/clear coat paint finish. Also disclosed are shaped articles which have such sheet materials adhered to one side therof, and a method for making such sheet materials.

Abstract: The PVC film contains a very small percentage of carbon black, which makes it possible to mark the film excellently by means of a laser beam.

Abstract: A para-phenylene sulfide block copolymer consisting essentially of a recurring unit (A) ##STR1## and a recurring unit (B) ##STR2## said recurring units (A) being present in the form of a block of 20 to 5,000 units of (A) on the average in the molecular chain, the mol fraction of the recurring units (A) being in the range of 0.50 to 0.98, the block copolymer having a melt viscosity (.eta.*) of 50 to 100,000 poise as determined at 310.degree. C. at a shear rate of 200 sec.sup.-1 and having: (a) a glass transition temperature (Tg) of 20.degree. to 80.degree. C., (b) a crystalline melting point (Tm) of 250.degree. to 285.degree. C.

Abstract: A process is provided herein for coating a preformed, porous base material comprising a mineral fibrous or particle material or an organic fibrous or particle material or mixtures thereof to provide a novel preformed base material. The process comprises applying at atmospheric pressure a coating of a vulcanizable elastomeric material in unvulcanized form to a surface of such preformed, porous base material. The elastomeric material is permanently adhered to the preformed porous base material by a hot press, hot vulcanization step. In this way the elastomeric material is substantially simultaneously both adhered securely to one outer surface of the base material and is penetrated and impregnated below and into the same surface of the base material to be within the porous structure of the base material, and is vulcanized therein in situ by the joint action of a pressure of about 50 to about 500 Newton/cm.sup.2 at a temperature of about 120.degree. C. to about 300.degree. C.

Abstract: The method is directed to a method of forming a hermetic flux-sintered ceramic multilayer structure with internal copper conductor comprising:(a) forming at least one green ceramic layer comprised of a thermoplastic organic binder having dispersed therein a finely divided ceramic powder and a low melting flux;(b) forming on the surface of a first green ceramic layer a pattern of copper-based conductor paste comprised of fine copper powder, a non-cellulosic binder, and a solvent for the non-cellulosic binder which is a nonsolvent for the thermoplastic organic binder in the green ceramic layer;(c) laminating a second green ceramic layer on the surface of the first ceramic layer to sandwich the pattern therebetween;(d) heating the composite structure in an ambient gas comprising a dry buffered gas mixture whereby maintaining an oxygen partial pressure sufficient to remove the organics but not to oxidize the copper.

Abstract: A decorative surface covering and a method of and an apparatus for making the decorative surface covering. The decorative surface covering has a transparent or translucent layer. The transparent or translucent layer contains a platey material oriented at two or more different angles with respect to the surface of the layer to provide an enhanced three dimensional effect to the decorative surface covering.

Abstract: A very thin abrasive material on a substrate is comprised of ceramic particulates contained within a metal matrix. The particulates extend fully through the matrix from the substrate surface to the machined free surface of the abrasive. In a representative 0.38 mm abrasive the particulates are sized normally at 0.42-0.50 mm and have an aspect ratio of less than 1.9 to 1. This enables a high density of particulates, in the range 33-62 per cm.sup.2, while at the same time ensuring good bonding in that most of the particulates are fully surrounded by matrix. When the abrasive is applied to the tip of a superalloy gas turbine engine blade, about 10-50% of the matrix metal is removed after machining. This allows the machined ceramic particulates to project into space and to thus better interact with ceramic abradable seals. In the preferred practice of the invention the particulates are alumina coated silicon carbide contained in a nickel superalloy matrix.

Abstract: A process for production of a metal-coated paper, such as for use in cigarette packs having a metal coating containing a binding agent which is applied to a paper backing material by a printing process. The coating includes particles which have a flake structure and which can be fully wetted by the binding agent, as a result of which the particles of metal are so firmly embedded into the coating as to provide sufficient abrasion resistance to permit the resulting composite paper to be used in a high-speed automatic packaging machine. In this process for producing such a paper, a tool is pressed against and passed over the metal coating while still moist to smooth out the metal coating, whereupon the metal coating is dried.

Abstract: A heated automobile backlight having a dark colored electroconductive grid. The composition includes silver powder, a glass frit such a lead borosilicate frit, and reducing agents such as stannous sulfate and chromic oxide.

Abstract: The present invention relates to structures exhibiting unique appearances resulting from the presence of crinkled chip materials. A reflective and/or nacreous platelet or flake material is intermixed with a plasticizer and a general purpose resin, and the mixture is formed into a reflective sheet. The reflective sheet is pulverized to provide a chip material which is then used alone or in combination with other chips to form a mottle comprising a vinyl chloride resin and a plasticizer. Upon consolidating the mottle into a decorative surface, the nacreous and/or reflective chips are found to surprisingly exhibit an enhanced crinkled appearance, thereby exhibiting unique aesthetic properties.

Abstract: A panel which comprises a substrate of transparent or translucent material having applied to one or both sides a design superimposed on, or forming part of, an opaque pattern so that the design on one side of the panel cannot be seen from the other side.

Abstract: A conductive elastomeric ink is described comprised of very fine nickel particles admixed in a silicone binder. The ink has utility in elastomeric switch control devices, printed circuits and the like.

Abstract: The present invention relates to structures exhibiting unique appearances resulting from the presence of crinkled chip materials. A reflective and/or nacreous platelet or flake material is intermixed with a plasticizer and a general purpose resin, and the mixture is formed into a reflective sheet. The reflective sheet is pulverized to provide a chip material which is then used alone or in combination with other chips to form a mottle comprising a vinyl chloride resin and a plasticizer. Upon consolidating the mottle into a decorative surface, the nacreous and/or reflective chips are found to surprisingly exhibit an enhanced crinkled appearance, thereby exhibiting unique aesthetic properties.

Abstract: An adhesive interconnecting means is comprised of one or more conductors on an insulating substrate, a first adhesive layer, said first layer being anisotropically conductive and disposed over said conductors and substrate and a second adhesive layer said second layer being a flowable adhesive that extends over the first substrate and anisotropically conductive layer. The anisotropically conductive adhesive is comprised of a nonhomogenous mixture of conductive particles in a nonconductive adhesive binder; the conductive particles, of random size and shape, are dispersed randomly throughout the mixture in noncontiguous conductive units, each unit being comprised of one or more individual particles, the units being sufficiently spaced apart to preclude electrical conductivity between adjacent conductive areas on the same substrate.

Abstract: Imageable products are described which can be made into dry transfer materials and other transfer materials by imaging them in an electrophotographic copier. The imageable products include an adhesive layer having a coating weight of between about 0.5 and 7 grams per square meter, releasably adhered to a substrate. A non-adhesive layer is applied over the adhesive layer, the non-adhesive layer having a thickness of less than about 30 microns and the non-adhesive layer being capable of accepting electrophotographic toner. The non-adhesive layer is incapable of being stripped from the substrate, to which said non-adhesive layer is releasably adhered by said adhesive layer, from a corner of said non-adhesive layer without fracture.

Abstract: A dark-colored undercoating is deposited on a desired surface area of a glass workpiece, and a light-colored overcoating is applied upon the undercoating, each coating being dried in less than about 60 seconds. Then a plurality of related marks is recessed through the overcoating by ablation, as with a laser beam. Each of the undercoating and the overcoating is comprised of pigment particles and an alkali silicate binder. Unlike the prior practice, the undercoating contains an operative proportion of mica particles, and the overcoating is essentially free from mica.

Abstract: An undercoating is deposited on a glass workpiece and an overcoating is applied upon the undercoating. Then a plurality of related marks is recessed through the overcoating, thereby producing the novel workpiece. Each of the undercoating and overcoating is comprised of pigment particles and an alkali silicate binder. The alkali silicate binder of at least one coating, and preferably both the undercoating and the overcoating, consists essentially of a mixture of sodium silicate, potassium silicate and lithium silicate. The coatings are made from aqueous suspensions of pigment particles, dissolved sodium silicate, dissolved potassium silicate and lithium-stabilized silica sol.

Abstract: A multilayer electric discharge recording material comprising an electrically anisotropic support layer disposed on one surface of a conductive layer and a transfer layer disposed on the other surface of the conductive layer. The transfer layer comprises a material that has a melting point between about 25.degree. and 150.degree. C. and that is capable of melting and adhering to a receiving medium such that a desired pattern or image can be formed and recorded on the receiving sheet.

Abstract: Magnetic recording media comprise a lubricated magnetic recording layer formed on at least one side of a permanent substrate. The magnetic recording layer comprises a contact layer of a polymer material which contains polyvinyl alkyl ether in an amount of from 5 to 30% by weight, based on the total weight of the polymer material, which is impregnated with a lubricant so as to improve the wear durability of the magnetic recording media.

Abstract: A barrier pigment is added to a fluorescent ribbon to prevent light from being absorbed into the media upon which the pigment is applied during printing. The barrier pigment is added to the fluorescent layer or is applied over the fluorescent layer as an additional layer.

Abstract: A composite material comprising a polymer matrix containing metallized sheet-form textiles and/or metallized particles, and in addition additives for increasing the ohmic, electrical and/or magnetic losses which are uniformly present in the polymer and/or on the sheet-form textiles and/or particles, has a high shielding effect against electromagnetic radiation both in the short-range field and also in the long-range field over a wide frequency range.

Abstract: Metalized recording papers contain, located on a paper web, a firmly adhering varnish coating in which mineral fillers and/or pigments combined with wax particles are embedded and the external surface of the varnish coating is covered with a metal layer, preferably an aluminum layer obtained by vacuum evaporation.

Abstract: Very good masking of pack diffusion aluminizing on any metal to keep portions from being diffusion coated, is effected by localized coating the lowest layer of which is depletion-reducing masking powder that can have same composition as substrates, mixed with non-contaminating film-former such as acrylic resin. The upper coating layer can be of non-contaminating particles like nickel of Cr.sub.2 O.sub.3 that upon aluminizing or chromizing become coherently held together to form a secure sheath. Such sheath can also be used for holding localized diffusion-coating layer in place. Film-former can be dissolved in volatile solvent, preferably methyl chloroform, in which masking powder or sheath-forming powder is suspended. Chromizing can be performed before aluminizing for greater effects. Aluminized cases are stripped from superalloys by alternating dips in fluoride-containing and fluoride-free aqueous nitric acid.

Abstract: A silver metallizing paste for attachment of silicon semi-conductive devices in lead-frame packages, specifically ceramic packages, which is less expensive than a gold preform but useable in hermetic packages, and provides better electrical and thermal conductivity, and higher bond strength, than silver polyimides. From 25 to 95% of silver is blended with a low-melting glass, preferably one having 95-96% PbO, and a paste or ink is formed with a suitable vehicle at 75-85% solids. Use of the paste follows conventional practice. Selection of Ag:glass ratio depends on the type of die bonding to be used. The paste is particularly useful in MOS technology, where low contact resistance is required, and also finds applications as a solder substitute and bonding chip capacitors. It is most advantageous in attachment of larger-area integrated circuits in that stress cracking associated with the gold-silicon eutectic is avoided.

Abstract: A marker tape for marking the positions of structural members behind wall panels comprises an elongated flexible carrier having incorporated therein, a reaction-responding material which can be detected by detectors operating on magnetic, electromagnetic, sonic, or some other phenomenon to indicate the positions of the structural members. One form of the marker tape comprises a flexible carrier supporting, on one or both sides thereof, a layer of adhesive, one of the adhesive layers having incorporated therein, granules of reaction-responding material, such as ferro-magnetic, ferrite or other metal particles. In order to increase the accuracy of locating the hidden structural members, the marker tape may be provided with the reaction-responding material only in an area centrally located along the width of the tape.

Abstract: A surprisingly corrosion and abuse resistant plastic object vacuum-metallized with a corrosion prone metal, namely indium, on a dielectric substrate consists of minute specular electrically-discrete "islands" of the indium topcoated with a clear resinous layer which encapsulates and insulates the islands, one from another. The indium islands are less than one thousand angstroms thick and have an average diameter of less than three thousand angstroms. This island structure is secured by stopping the growth of the metal as it is deposited between the nucleation stage and the stage of channelization or formation of an electrically conductive film. The island structure permits the dielectric resinous topcoat to penetrate in, about and under the metal islands encapsulating and securely bonding them to the substrate.The vacuum deposited indium gives a bright sheeny appearance which, when properly topcoated, very closely duplicates the appearance of electrodeposited chrome.

Abstract: An electrically conductive element comprises a support (perferably a flexible continous polymeric film) and fibrous material (preferably a spun glass fiber web) which is partially embedded in the support and partially protruding therefrom, the protruding fibrous material being part of a conductive layer comprising randomly distributed fibers having conductive material adhered thereto. The element can be prepared from a conductive composition containing conductive particles dispersed in a liquid medium (preferably an aqueous dispersion of carbon particles) by applying said composition to a substrate comprising a support and fibrous material which is partially embedded in one surface of the support and partially protruding therefrom, and then drying to evaporate the liquid medium. The elements are particularly useful as heating elements which comprise electrodes so that current can be passed through the conductive layer.

Abstract: A process for preventing the counterfeiting of valuable documents through use of photography, photocopying techniques, or other methods of counterfeiting. The process includes laminating an extremely thin metallic film to the substrate of the valuable document before the document is printed with the area of the metallic film being small in comparison to the area of the document. The metallic film can be located anywhere on the face of the document and a "latent image" is embossed on the metallic film when the document is printed. Embossing the latent image on the metallic film, rather than on the document substrate, provides many advantages not possible in the prior art.A photocopy of a document containing the embossed metallic film does not include the latent image and a color photocopy will be different in color than the original document. Therefore, a lay observer can readily differentiate between a genuine document and a counterfeit document.

Abstract: The present invention relates to the decoration of sheet materials and has particular reference to the application of decorative stones either alone or in combination with embroidery patterns to sheet materials.

Abstract: An electrostatic recording member comprising a recording layer, an electrically conductive layer and a support, wherein the electrically conductive layer is composed of from 2 to 40 parts by weight of electrically conductive micro-fine powder dispersed in from 60 to 98 parts by weight of an organic polymer binder, and has a surface resistivity of 10.sup.6 to 10.sup.8 Ohms.

Abstract: There is disclosed a process for manufacturing surface coverings including the steps of printing a design on a base layer; overlying the printed base layer with a coating of substantially transparent or translucent material; printing a subsequent design using an ink including decorative particles on such transparent or translucent overlying material; and overlaying the ink printed design with a substantially transparent or translucent material prior to subsequent processing, such as heat curing to ensure an effectively fused product of the resulting surface covering. The present invention may include the required processing steps of chemical or mechanical embossing as more clearly hereinafter described.

Abstract: A thick film is formed initially as a paste and made up of such oxidizable conductor ingredients as copper which is then mixed with glass frit and next printed on a non-conductive inert substrate by silk screening. The silk screen printed thick film with vehicle is then dried, and a coating of boron in suitable paste or paint form having been mixed with a thixotropic organic vehicle is covered over the entirety of the substrate and silk screen printed thick film. The resulting product after a second air drying is then fired to bond the glass frit-copper as a thick film onto the substrate, with the copper particles being sintered throughout into a thick film. Superposed boron, where contiguous with the copper printing, is fused as a protective layer over the copper allowing the sintering of the copper and bonding with the substrate to occur without oxidation of the copper.

Abstract: A surprisingly corrosion and abuse resistant plastic object vacuum-metallized with a corrosion prone metal, on a dielectric substrate consists of minute specular electrically-discrete "islands" of the metal topcoated with a clear resinous layer which encapsulates and insulates the islands, one from another. The metal islands are less than one thousand angstroms thick and have an average diameter of less than three thousand angstroms. This island structure is secured by stopping the growth of the metal as it is deposited between the nucleation stage and the stage of channelization or formation of an electrically conductive film. The island structure permits the dielectric resinous topcoat to penetrate in, about and under the metal islands encapsulating and securely bonding them to the substrate.

Abstract: A silver metallizing paste for attachment of silicon semi-conductive devices in lead-frame packages, specifically ceramic packages, which is less expensive than a gold preform but useable in hermetic packages, and provides better electrical and thermal conductivity, and higher bond strength, than silver polyimides. From 25 to 95% of silver is blended with a low-melting glass, preferably one having 95-96% PbO, and a paste or ink is formed with a suitable vehicle at 75-85% solids. Use of the paste follows conventional practice. Selection of Ag:glass ratio depends on the type of die bonding to be used. The paste is particularly useful in MOS technology, where low contact resistance is required, and also finds applications as a solder substitute and bonding chip capacitors. It is most advantageous in attachment of larger-area integrated circuits in that stress cracking associated with the gold-silicon eutectic is avoided.

Abstract: A conductive layer (13) adhesively joined to an electrically inert substrate (10) by an organic binder component. The organic binder consists of a resin not substantially less than 15% nor more than about 35% by weight of the composition which further includes dispersed metallic material within the binder and forming the electrically conductive component of the solderable material. A solderable surface layer (15) of the conductive layer (13) includes exposed metallic material suitable for solder bonding terminations (16) to the conductive layer (13), such solderable surface layer (15) being adhesively joined to the binder by means of the organic matrix.

Abstract: An electrographic recording material comprising a conductive sheet support coated with an electrically insulating layer comprising an intimate blend of a polymeric binder and from about 200 to about 1000 parts of an inert finely divided pigment per 100 parts by weight of polymeric binder. The binder contains a major proportion of a low molecular weight interpolymer comprising a monovinyl aromatic monomer, a C.sub.3 -C.sub.7 allylic alcohol and optionally a monocarboxylic acid ester of a C.sub.3 -C.sub.7 allylic alcohol, and a minor proportion of high molecular weight interpolymer.

Abstract: A surface treatment for ethylene/vinyl acetate copolymer film resulting in an elastomeric, heat sealable film which retains its transparency after release from 200 percent elongation. The treatment comprises irradiation and controlled surface hydrolysis and, optionally, subsequent attachment of mineral particulates to the surface of the film with or without the use of coupling agents.

Abstract: Electrically conductive through-holes in a substrate are prepared by (a) laminating a film based plastic photosensitive toner-receptive stratum to at least one surface of the substrate; (b) applying a pressure differential across the stratum covering the substrate holes, the outside pressure exceeding that inside the holes; in either order (c) removing at least one film base or (d) exposing the photosensitive stratum imagewise, (e) adhering metal or catalytic particles to hole walls and image areas, (f) optionally hardening or curing the particulate areas and (g) providing an electrically conductive printed circuit and through-holes, e.g., by plating metal electrolessly, soldering or conjoining the metallized or catalyzed areas.