Abstract: A method for making a key top of a push button is disclosed, in which a part of a light intercepting paint, which is the uppermost layer at each of displaying portions on the top surface of the key top, is removed so as to expose a displaying ink printed previously under the layer in accordance with the shape of the display portion.

Abstract: A process for covering a substrate with a textured simulated marble surface and the resulting product. In the process, cement and sand are mixed to form a first mixture to which is added an aqueous solution of an adhesive resin such as an acrylic resin to create a first mortar. The cement and sand are mixed to form a second mixture to which is added an aqueous solution of an adhesive resiin such as an acrylic resin to create a second mortar. A contrasting pigment is added to one of the first and second mortars or to each of the mortars. The first mortar is applied over the entire substrate. The second mortar is applied onto randomly spaced portions over the previously applied first mortar prior to the complete curing of the first mortar to form a unitary textured covering. The textured unitary coating includes a lower layer and an upper layer with the upper layer comprising the second mortar and the lower layer comprising the first and second mortar.

Abstract: A method of finishing the surface of a structure, which comprises fixing a rigid or elastic pattern member on a surface, with the pattern member including a releasable covering material applied thereto, applying a coating material to the surface and the member, removing the covering material, which is peelably attached on the surface of the pattern member, together with an uncured portion of the coating material placed on top of the pattern member, before the coating material is completely dried, and curing the coating material. In this way, the pattern member remains in the coating material as a joint, providing an attractive surface finish disposed within the coating material.

Abstract: A method of forming oxide masks in silicon in which oxygen ions are implanted into the silicon.

Abstract: A method for painting an article includes the steps of dipping the article in a mixture of varnish and silicone rubber so as to form a protective film on the surface of the article; priming the protective film; spray painting the article so as to form a plurality of paint flecks to form a plurality of patterns on the article; applying a solvent to the article to dilute the paint flecks; air-drying the article; polishing the surface of the article; forming a layer of epoxide resin on the surface of the article; and bake varnishing the article. In this way, the surface of the article is given a flecked and glossy surface.

Abstract: A colored coating soft fired on a ceramic baseis scratched to remove the coating where scratched to produce a picture or design which is preserved by hard firing and glazing.

Abstract: A method of correcting a missing defect of a patterned film formed on an icle is carried out by steps of providing an operative vacuum chamber having a pin hole, positioning an area of the missing defect outside the vacuum chamber in registration with the pin hole, operating the vacuum chamber to cause therein cold cathode discharging to generate particles, and directing a stream of the particles through the pin hole onto the area of the missing defect to deposit thereon a corrective film of the particles.

Abstract: A method of silk screen printing on a piece of paper, such as poster paper, in which a first silk screen printing is effected onto the sheet utilizing a printing ink that produces minimal curl in the edge of the sheet, and at least one subsequent silk screen printing is effected onto the sheet utilizing a water-based printing ink. The resulting curl is less than that which would be obtained if the first screen printing were made with the water-based ink.

Abstract: A method of printing a number of superimposed or otherwise geometrically related layers on a substrate with exact registration which comprises printing said layers over one or more areas on said substrate so as to overlap the boundary of said one or more areas and then removing the layers outside said areas. The product produced by the method and the intermediate product prior to removal of layers outside the areas can be used for security purposes.

Abstract: A method of corrosion, sound and vibration-proofing of a metal structure which comprises masking a selected surface of said metal structure with a polystyrene foam masking member wherein said polystyrene foam has a closed cell structure and the density of said polystyrene foam is in the range of 12.5 to 50 g/l, coating the surfaces of said metal structure, including said masking member, with plasticized polyvinyl chloride by the spray coating and removing said masking member from the resulting polyvinyl chloride-coated metal structure by stripping off said masking member with a hook for removal from said polyvinyl chloride-coated metal structure, and said masking members are panel types for the even surfaces of said metal structure, block types with a slit for the panel like parts of said metal structure, tube types with a hole for the protruding parts of said metal structure, and plug types for the holes in said metal structure.

Abstract: A method and apparatus for inspecting and repairing a mask usable in the manufacture of semiconductor microcircuits, by using an electron beam is disclosed. The inspection and repair of a mask pattern are made in a single apparatus, by using a controlled current of an electron beam. For inspection, the surface of a mask having a mask pattern and a radiation-sensitive layer, covering it, is scanned with an electron beam and, by detecting secondary electrons or reflected electrons caused at that time, the state of the pattern is inspected. If any defect is detected, the portion of the radiation-sensitive layer on the detected defect is irradiated with an electron beam of greater magnitude than that for the inspection and, thereafter, the exposed portion of the radiation-sensitive layer is removed. Then, etching or plating is made to the thus uncovered portion, whereby repair of the mask pattern is made.

Abstract: A method and apparatus for making a pliable wallcovering. The wallcovering replicates the appearance of aged, cracked plaster wall finishes, can be readily hung over existing walls, and is durable. In the method of making the wallcovering a putty-like joint compound mixture is applied to a pliable stretchable woven sheet. The sheet is comprised of strands forming interstitial openings extending through the sheet. The joint compound mixture is forced through the interstitial openings and is allowed to dry. The dried joint compound mixture is cracked in a manner which renders the wallcovering pliable.

Abstract: A two-dimensional pattern of a silicon oxide film is formed on a silicon surface of a substrate, thereby to form a material, the two-dimensional pattern being represented by the presence and absence and/or thickness variations of the silicon oxide film. The material is nitrided to form a modified layer on the surface of the material, the modified layer being thicker on the silicon oxide film and thinner on the silicon surface of the substrate or thicker on the thicker portion of the silicon oxide film and thinner on the thinner portion of the silicon oxide film. The thinner portion of the modified layer is removed while leaving the thicker portion of the modified layer, for thereby forming the modified layer on the silicon oxide film substantially in the same shape as the silicon oxide film.

Abstract: A method for providing a circuit pattern on an insulated substrate that has improved adherence thereto. By providing an electroless conductive layer of a predetermined thickness on the substrate and thereafter exposing the substrate to an ablative laser beam, the resultant conductive lines are stronger than those provided by previously known techniques.

Abstract: An MOCVD deposition technique wherein the pressure of reagent vapors within the reaction vessel (1) is maintained at a reduced pressure in the range 10.sup.-2 to .about.10 millibars and contained mounted substrates (15) are heated non-inductively e.g. by an electric resistance circumferential furnace (5). In the above pressure range, high diffusivity of the reagent vapors ensures exposure of the substrates (15) to a uniform reagent mixture. A large number of substrates (15) may be processed simultaneously. As heating is non-inductive, an inert mounting (17) can be utilized avoiding the introduction of contaminants (e.g. carbon) into the deposited film.

Abstract: An erroneously recorded image among recorded images on a recording medium is corrected by a correction sheet comprising an adhesive layer on a support. The adhesive layer is heated to develop an adhesive force and caused to adhere to the error image and peel the error image when the correction sheet is separated from the recording medium. The adhesive layer comprises a laminate structure including a separation prevention layer and an upper layer, and the separation prevention layer is in charge of cohesion strength, intimate adhesion to support and flexibility under heating of the adhesive layer. Because of the laminate adhesive layer structure, the correction sheet allows for adequate correction of an error image even on a recording medium with poor surface smoothness without causing correction failure, such as reverse transfer.

Abstract: According to a method of manufacturing a multi-layered wiring substrate, a palladium thin film is formed on an entire surface of a substrate including a conductor wiring layer. A portion except for a predetermined via formation portion on the palladium thin film is masked by a first photoresist. A polyimide-based conductive resin is embedded in the via formation portion through the first photoresist. The first photoresist is removed. The conductor wiring layer and the via formation portion are masked by a second photoresist. The exposed palladium thin film is etched. The second photoresist is removed. The conductive resin is cured. A photosensitive polyimide resin is applied to an entire surface of the substrate, a via-hole is formed in the via formation portion, and the photosensitive polyimide resin is cured.

Abstract: In a process for masking a part subjected to a high pressure washing cycle between the applications of two or more paint coats, the improvement comprising the steps of: spray coating on a prepainted part a washable masking material which is cuttable when set to form a nonwicking edge; self adhering the spray coating and cutting it along a paint line to form a nonwicking mask edge which prevents paint leakage or the trapping or washing solution between the masking material and part and leakage of such trapped washing solution onto a subsequently painted surface. The process includes the step of cutting and cleanly peeling a portion of the masking material from the part following the drying of the sprayed mask to expose part of the prepainted surface; at least one subsequent washing and drying of the masked part; and at least one subsequent painting of the exposed prepainted surface.

Abstract: A method of coating embossed panels having embossed panel portions which are offset in generally parallel planes. A liquid accent coating is applied to the panels as they are moved along a predetermined path. A roll is reverse rotated to wipe liquid coating from the high points of the embossed panel surfaces, creating a high level of contrast with the relief portions where a greater amount of coating remains. The rolls do not wipe the steps between panel portions so that the steps are more heavily coated, to create a dark shadow line. Doctor blades strip coating from the roll, except in those portions that do not contact the panel steps. Vacuum removes excess coating from the stepped areas of the panels and also from those portions of the rolls not contacted by the doctor blades. Apparatus for carrying out the method is also disclosed.

Abstract: This invention pertains to the fields of graphic arts and graphic communication. The principal use of this invention is to communicate visually with a new graphic method--a method of putting a translucent overlay on one color of pastels uniformly on a piece of paper and then removing it by erasure in order to create a desired image. The paper can be imprinted before the overlay is applied in order to give a foundation for the erasure. One prior method of graphic communication has been to put a color or several colors on a paper nonuniformly to create a desired image. Likewise, another prior method has been computer-generated images on cathode ray tubes. Both of these prior methods require training and skill. Neither are easily accomplished. This new method requires no artistic or computer skill and gives excellent results. Further, this new graphic method can be renewed by rubbing the translucent overlay back to a uniform color and an additional image created by erasing again.

Abstract: A cementitious slab first has generally straight intersecting lines drawn thereon and the surface of the slab is thereafter cut in order to form narrow shallow grooves therein extending along the previously drawn lines. The entire upper surface of the slab is then washed with an acid wash, neutralized and then pressure washed. A first stain coat is then evenly applied to the upper surface of the slab including the grooves and a second stain coat is thereafter applied to at least some of the discrete areas of the upper surface of the slab in an uneven manner with the second stain being darker than the first stain to thereby render a mottled appearance to the upper surface of the slab. Thereafter, the entire upper surface of the slab including the grooves may be sealed.

Abstract: An electrical circuit arrangement includes a conductive link through an insulating layer separating two conductive layers. This link is formed by placing an evaporable plug on a first conductive layer, forming the insulating layer around it and then vaporising the plug. The resulting gap is then infilled with conductive material and a second conductive layer formed on the insulating layer.

Abstract: A composition and method for providing temporary masking of electrical and electronic components compatible with a high speed production operation. The composition is a radiation curable viscous liquid composition which provides minimal adhesion properties and substantial cohesive properties so that when cured, it can be readily removed in the manner of an adhesive tape. In particular, the radiation curable composition is characterized by cured properties a) of positive adhesion to the substrate to which the composition is applied, but insufficient adhesion to resist peeling forces applied by hand; and b) of sufficient cohesive strength to allow substantially all of the cured composition to be stripped mechanically or by hand in a single piece. Suitably the adhesion of the cured composition (22) to the substrate (16) as measured in the tensile shear mode, is between about 5 and 55 psi.

Abstract: A printed circuit board, in which the substrate (1) and interconnections (2) are masked by a solder-resistant lacquer mask consisting of two layers of lacquer (4,5), the lands (3) being left unmasked, one layer of lacquer (4), which extends to the edges of the lands (3) and directly masks the substrate (1), is provided at least in the region of the lands (3), and the other layer of lacquer (5) masks the interconnections (2), while leaving the lands (3) unmasked, and extends to the region occupied by the layer of lacquer (4) extending to the edges of the lands (3) the two layers overlapping.

Abstract: A process for finishing a textile fabric by coating the fabric with a compound which is crosslinkable by reaction-initiation radiation, exposing the back of the coated material to reaction-initiating radiation to induce crosslinking of said compound exposed through the fabric web, and removing the non-crosslinked compound.In accordance with the process of the present invention, the individual threads of the fabric act as a screen, so that crosslinking of the radiation-sensitive compounds by irradiation can only take place between the threads and not inside them, i.e. it takes place between the fibrils. This results in a differentiated porosity. The water resistance of the treated fabric is improved due to the crosslinking between the threads.

Abstract: A method of manufacturing a foil material having a metal layer on a region thereof comprises applying to a backing foil a layer of a soluble material such as a lacquer to which a hardening agent is then applied in selected regions thereof, the hardening agent reacting with the soluble material to cause it to harden. A coating of metal is then applied over the layer of soluble material and the portions of the layer of soluble material which have remained soluble are then removed, thereby also removing the portions of the layer of metal thereon and leaving the metal on the hardened portions of the layer of soluble material. The foil material made by the method is also disclosed.

Abstract: A method of providing different colored layers of paint on glass, which method comprises roughening a surface of the glass, applying a first lot of soluble resist to predetermined areas of the roughened glass, then applying a first color paint to the glass, drying the paint, washing off the first lot of soluble resist to expose unpainted roughened glass, drying the glass, applying a second lot of soluble resist on top of some of the first colored paint and on top of some of the exposed unpainted roughened glass, applying a second color paint to the glass, and washing off the second lot of soluble resist to leave the glass with at least one area where the first and the second colors are overlaid, at least one area where the roughened glass only has the first color, and at least one area where the roughened glass only has the second color.

Abstract: A method of making read-only magnetic recording media by the use of photolithographic/photoresist techniques, and the vacuum deposition of discrete bits of a high coercivity metal, followed by magnetization of said metal. A nonmagnetic substrate is covered by a layer of photoresist and a layer of high coercivity magnetic material. Selective light-pattern exposure of the resist, followed by layer-removal-procedures, cause the substrate to be covered by islands of hard magnetic material, in the pattern of a desired data track. The substrate is then subjected to the influence of a steady-state magnetic field in order to convert the metal islands into a read-only data pattern which can be read by a magnetic head. A floppy disk of this type is used to stress-test the head placement of floppy disk drives.

Abstract: A process for preparing a graphic pattern on a carrier having a protective coating thereon in exact registration with the pattern, and the article produced thereby. The process comprises applying a liquid protective coating over the graphic pattern slightly beyond the edge definition of the pattern and in substantial registration therewith, the protective coating having sufficient surface tension to wet the graphic pattern, but not the surface of the carrier. When the protective coating is dried, it dewets and retracts from the surface of the carrier onto the graphic pattern and provides exact registration therewith.

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: A process for covering a substrate with a textured simulated marble surface by mixing cement and sand to form a first mixture to which is added an aqueous solution of acrylic resin to create a first mortar. The cement and sand are mixed to form a second mixture to which is added an aqueous solution of acrylic resin to create a second mortar. A contrasting pigment is added to one of the first and second mortars. The first mortar is applied over the entire substrate. The second mortar is applied onto randomly spaced portions over the previously applied first mortar prior to the complete curing of the first mortar to form a unitary textured covering. The textured unitary coating includes a lower layer and an upper layer with the upper layer comprising the second mortar and the lower layer comprising the first and second mortar.

Abstract: A method for providing a dual layer diffusion mask or encapsulation coating for use with III-V compound semiconductors, the dual layer coating comprising an inner layer of silicon which closely matches the coefficient of thermal expansion of the III-V compound semiconductor and an outer layer of silicon nitride which is relatively impermeable to subsequent metallization and for thereafter applying metallized contacts to the III-V compound semiconductor through selectively etched openings in the diffusion mask or encapsulation coating.

Abstract: Disclosed is a method for repairing opens in thin film conductor lines on a substrate, preferably a multi-layered ceramic substrate. An unpatterned repair metal film is placed over a general area of open defects in conductive lines on a substrate. Preferably, this metal is placed over the conductive lines and opens therein by decal transfer. The assembly is then heated to cause diffusion bonding between the repair metal and conductive lines, but not between the repair metal and substrate. After diffusion bonding, the structure has metal bridges formed across any open defects covered by the repair film and also between adjacent conductive lines. The area of repair is then subjected to ultrasonic energy in a liquid ambient for a time at least long enough to remove metal bridges between adjacent conductive lines, but less than that required to remove repair metal bridges over the opens in the conductive lines.

Abstract: This disclosure relates to a method of manufacturing a sign or similar article by providing a wooden substrate having an upper surface; providing a laminate formed by several plies including a ply of sandblast-resistant material, an adhesive, a ply of vinyl, another adhesive and a carrier ply; cutting the laminate to form a template of a desired configuration and applying the template to the upper surface of the substrate, sandblasting the upper surface of the substrate which removes an upper surface strata thereof which is exposed to the sandblast material while unexposed surface strata is uneffected, and thereafter removing the sandblast-resistant ply from the vinyl ply forms a permanent upper covering/indicia/design atop the selected area of the substrate unaffected by the sandblast material.

Abstract: A base web is prepared which has two parallel layers of nonwoven fiber glass webs, each impregnated with a solidified resinous composition and separated from each other by a core layer of an expandable solidified resinous composition which is bonded to the resinous composition used to impregnate the fiber glass webs by a thin integral layer of nonexpandable resinous composition. Additional layers of resinous material, expandable and nonexpandable, and decorative effects may be supported by the base web. The composite web is subjected to heat processing to expand the core layer and other expandable layers that may be present and to fuse the resinous composition used in the construction of the product. The processes are particularly adaptable for the production of shapes such as floor tiles and decorations that employ chemical embossing.

Abstract: A process for providing circuit lines on a substrate having a non-planar surface is provided. The process includes applying a layer of photoresist material to the substrate, selectively screen printing on non-planar areas of the substrate a screen-printable coating, photoprocessing the layer of photoresist material, and providing electrical conductive pattern on the substrate.

Abstract: A process of reinforcing a polyethylene coated blank in which a reinforcing stripe is applied to a polyethylene coated web along a longitudinal score line which is to be scored. The web is thereafter scored along the line and the blank is cut from the web. The reinforcing stripe has a major portion of polyethylene, a small amount of vinyl acetate and a polypropylene/polyisobutylene copolymer. During the application, the stripe material has a viscosity of 18,000-26,000 centipoise.

Abstract: A stamping foil which comprises a flexible supporting web, a lubricating layer provided on substantially whole one surface of the supporting web, a colored water-resistant resinous layer having a desired pattern and a metal deposition layer having a desired pattern provided on the lubricating layer, and an adhesive layer provided in a manner that all of the exposed surfaces of the lubricating layer, of the colored water-resistant resinous layer and/or of the metal deposition layer are covered by the adhesive layer. The stamping foil has an advantage that even a complicated combined pattern of the colored layer and the metal deposition layer can be obtained by a single operation with ease and low cost.

Abstract: A deposition reactor system is described for producing a coating containing a predetermined component on a substrate from a plasma containing such component in an ionized state. The substrate is supported on a susceptor within a reactor chamber to which is introduced a gas containing the predetermined component. A radio frequency field is inductively coupled to the gas, forming a plasma in the reactor chamber in the region of the susceptor. The susceptor is maintained at ground potential in the radio frequency field.

Abstract: A method of creating decorative designs by blending a spackling compound with a caulking compound and thickening the mixture with dry masonry repair compound. Water is added as needed for thinning and paint is used to obtain the desired coloration. A plurality of different colored batches can be prepared so that multi-colored designs or decorations can be produced. The blend used in the method of the present invention can be shaped into almost any desired design on almost any dry surface or the designs can be created on wax paper and transferred to the final surface using uncured product as the bonding agent.

Abstract: A method for the application of highly absorbent material onto a moving substrate includes the steps of dispensing a melt adhesive film onto precisely defined areas of the substrate, covering such areas with the absorbent material and then removing excess absorbent material which did not adhere to the adhesive coated areas. The apparatus for practicing this method includes, in one embodiment, an adhesive applicator head operable to dispense the adhesive at timed intervals onto the moving substrate, a measuring head located downstream from the applicator head and timed to release the absorbent material over the adhesive covered areas moving past and a vacuum or mechanical cleaning device for removing excess absorbent material from the substrate. In an alternative embodiment, the measuring head is replaced with a receptacle containing absorbent material within which the substrate is immersed for coating the adhesive covered areas.

Abstract: The invention relates to a matrix device for the detection of light radiation with individual cold screens integrated into a substrate and to its production process. This device comprises detectors arranged in matrix-like manner and defined in a detection material, a substrate which is transparent to the radiation to be detected and on which is epitaxied the detection material and provided in its upper part with blind holes distributed in matrix-like manner, each hole being positioned facing a detector, a layer of anti-reflecting transparent material covering the bottom of the holes and a layer of a material absorbing the radiation covering the upper face of the substrate and the walls of the holes.The invention more particularly applies to an infrared imaging system.

Abstract: 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: In the production of a decorative sheet, a synthetic resin paste is first applied onto the upper surface of a substrate sheet to form an undercoat layer. Then, one or more pastes, each being of the same material and having approximately the same viscosity as the paste of the undercoat layer, are laterally sprayed so as to drop onto the undercoat layer. The result is a smoothing phenomenon, with the pattern layer cooperating with the undercoat layer to form a smooth patterned surface. Finally, the pattern layer is heated and jelled.

Abstract: The present invention is to positively provide a light pen pick-up phosphor pattern by the application of an inverting method and the selection of its slurry composition. That is, this invention relates to a method for producing a phosphor screen of a cathode ray tube which comprises the steps of forming a photo-sensitive material layer with a predetermined pattern on the inner surface of a cathode ray tube panel, coating on the whole surface of the panel including the photo-sensitive material layer with a phosphor slurry for use in light pen pick-up and removing the photo-sensitive material layer to thereby form a light pen pick-up phosphor pattern which is an inverted pattern of the former pattern.

Abstract: A method of manufacturing a patterned, colored surface on an object having a surface of relatively low surface absorption when compared to the interior of the object, and the article produced by the method. The method comprises the steps of first preparing the pattern on the surface of the object by contouring predetermined portions of the surface, so that recesses are created therein having a substantially greater surface absorption, and subsequently applying to the entire surface including the recesses a paint containing dye pigment, solvent, and about 0.5-8%, calculated on the entire quantity of the paint, of inert, non-soluble fine-grained particles having a maximum cross dimension which is substantially larger than the maximum cross dimension of the dye pigment.

Abstract: Fabric conditioning articles for use in treating fabrics in a laundry dryer. The articles comprise a flexible substrate and a fabric conditioning composition, wherein the fabric conditioning composition is distributed unevenly on the substrate so as to form a visual contrast between areas containing relatively high amounts of conditioning composition and areas containing either no conditioning composition or relatively low amounts thereof.

Abstract: Disclosed is a screening paste for covering a selected portion of a metallurgical pattern on a substrate while leaving other metallurgy uncovered. The paste is free of polymers and consists, in one example, of 75-80% of a ceramic particulate (such as alumina), 2-8% amorphous fumed silica and 15-20% of linear alcohol. The linear alcohol serves as a vehicle to deliver the solid particles in the paste. In use, after covering the selected portion of the metallurgical pattern with the paste, the alcohol content therein is expelled by subjecting to vacuum treatment at room temperature or heating to a low temperature below about 275.degree. C. thereby obtaining an inert, dry and crack-free protective coating. Upon evaporation of a new metal layer onto the substrate and removal of the protective coating and new metal layer from everywhere except the uncovered metallurgy, the metallurgical pattern is selectively coated with the new metal.

Abstract: A process for the production of colored films of paper impregnated with synthetic resin which contain melamine resin and have a three-dimensional surface structure, by printing the paper films with a colored pattern using an aqueous protein-based printing ink and lacquering thereover. The color which is printed in the regions in which the lacquer layer is to be thinner than in the other regions contains a lacquer repellent, and the printed and dried paper film is impregnated with an aqueous impregnation of a melamine resin from the unprinted side, with the formation of a one-sided excess of resin, and is dried. The printed and impregnated film is coated on the printed side with an aqueous lacquer based on melamine resins, and the lacquered film is hardened at elevated temperature without applying pressure. A laminate is produced by joining the unprinted side of the hardened film to a substrate such as chipboard.

Abstract: A method of manufacturing finished articles of flexible plastic material includes formation of a sheet of plastic material with a first portion having a raised pattern on one surface thereof and at least partially curing the sheet. The first portion having the raised pattern is removed from the sheet and a second portion of plastic material having a raised pattern on one surface and of a color contrasting with that of the first portion is formed in that area of the sheet from which the first portion was removed. A plastic backing layer is formed on the sheet and the article thus formed is cured. The backing layer may be of a color contrasting with that of the second portion of plastic material, or the first portion may be allowed to remain and its back surface may be coated with a layer of plastic of a color contrasting with that of the first portion after which the backing layer is applied.