Abstract: A porous implantable oral prosthesis which can be used to replicate and replace any hard tissue portion of the mouth such as bone and teeth is described. The prosthesis comprises sintered polymeric particles coated with a hydrophilic material. The polymeric particles vary in size so as to provide an area of relatively coarse porosity where the prosthesis is intended to interface with bone tissue and relatively fine porosity where it is intended to interface with soft tissue. A process for producing such prosthesis by filling a mold with appropriate molding compounds comprised of polymeric particles and a hydrophilic monomer, sintering the particles and polymerizing the monomer by dielectric heating, removing the sintered material from the cooled mold, and placing the prosthesis in a hot liquid to remove residues is described. An entire tooth, including a nonporous crown may be produced.

Abstract: Encapsulation of electronic components.Method of encapsulating bare electronic components (11) present in the form of a continuous strip (12) and intended to be provided with envelopes (13, 14) of a defined form made of at least one plastic material (15), characterized in that by extrusion by means of an extrusion head (16) the plastic material (15) is given the profile desired for the said envelopes (13, 14), while the bare electronic components are continuously inserted and immobilized in the said profile, and in that in a final operation common sections of extruded plastic material (15) and of a strip (12) of components are cut so that the bare electronic components (11) thus provided with their envelopes (13, 14) are mutually separated.Application in the manufacture of display elements.

Abstract: The holding device for a shower post is provided with a holding member, which can be fixed by a fixing element to a wall and which can be coupled to the shower post. At least the outer wall surface of the holding member is made from a transparent to clear material and is made matt to reflecting on the inside by an unglazed design. In conjunction with the transparent construction of the outer wall surface, this ensures that it is not possible to see into the interior of the holding member, the latter assuming the color of the wall to which the holding member is fixed.

Abstract: Improved light reflector apparatus for use in an electronic flash unit or the like is formed by an injection molding operation, which causes both precise shaping of a reflector and accurate mounting of the reflector securely within a housing. A light-reflecting flexible sheet is placed in a mold so that its light-reflecting front surface is centrally positioned adjacent a mold forming surface. The forming surface, which is larger than the sheet, has a contour adapted for shaping the sheet to reflect light into a beam of illumination. Liquid plastic is injected into the mold under pressure against the opposite surface of the sheet, thus pressing its light-reflecting surface into intimate contact against the forming surface. Because the sheet is smaller, the border of the forming surface is not covered by the sheet. Plastic flows beyond outer edges of the sheet against the uncovered border of the forming surface.

Abstract: A method of making a photoflash article including a substrate member, a plurality (e.g., ten) of electrically-activated photoflash lamps, and a light-transmitting polymer covering which encapsulates each of the photoflash lamps and is also secured to the substrate member to define a unitary component. The substrate is produced by injection molding with each of the lamps subsequently positioned therein. This assembled component is then either placed within an injection mold apparatus and a predetermined quantity of thermoplastic or thermosetting resin injected therein to define the polymer member, or the polymer is added in liquid form to completely fill each of the substrate member's individual lamp-receiving compartments. The finished article is especially suited for forming part of a completed photoflash device further including circuitry and other items, such as described in the present art.

Abstract: A method for repairing cracked and broken plastic articles such as lenses for automobile signal lights and the like comprises the steps of placing a form against a first surface of the plastic article such that the form covers the broken area, preparing an adhesive sealing compound which cures by exothermic reaction, applying the compound to the damaged areas of the lens from an opposite surface of the lens, heat generated by the exothermic reaction causing decreased viscosity of the compound and widening of cracks in the lens, the compound flowing into the widened cracks before curing, and, removing the form after the compound has cured, whereby repaired portions of the lens diffuse light in a manner substantially indistinguishable from undamaged portions, and repaired portions are of comparable structural strength to the balance of the lens.

Abstract: Polyethylene terephthalate moulding compositions which contain delaminated kaolin may be processed into highly-reflecting objects.

Abstract: Disclosed herein are a method and apparatus for continuously embossing a repeating pattern of precise detail, in particular, cube-corner type reflector elements, on one surface of a sheet of transparent thermoplastic material to form retroreflective sheeting. A continuous embossing tool in the form of a flexible thin metal belt or cylinder has on its outer surface an embossing pattern which is the reverse of the pattern to be formed. The embossing tool is continuously moved at a predetermined speed along a closed course through a heating station where the temperature of a portion of the embossing tool is raised to be above the glass transition temperature of the sheeting and a cooling station where the heated portion of the embossing tool is cooled to be below that glass transition temperature.

Abstract: Cylindrical embossing tools are constructed from one or more masters formed by accurately scribing the face of a substrate along three axes in the face to produce a pattern of tetrahedrons. The plurality of masters, or replicated copies made from a single master, are assembled in a fixture and seamless copies are made by electrodeposition of nickel using various shielding and grinding methods to provide replicated copies of uniform thickness. The replicated copies are assembled and used to form larger electroforms until a generally cylindrical embossing tool of the correct width and circumference is created. Novel processes and apparatus are provided for removing the electroformed cylindrical tool from its mother cylinder.

Abstract: A method of making cosmetic hydrogel contact lenses which alter the apparent color of the iris by employing small light reflecting particles imbedded in a colored transparent matrix.Cosmetic contact lenses as described herein are of a dual purpose to correct the visual errors and change the apparent color of the eye. The material iris pattern is visible through the lens providing a natural appearance.

Abstract: A new method for producing retro-reflecting assemblies of the type comprising a transparent globule having an essentially part-spherical upper portion uncoated for light impingement, and a lower portion associated to a monolayer of focusing and reflective microspheres, the method comprising forming said globule by subjecting a sheet thermoplastic material to heat and pressure in the bite of counter-rotating forming rollers to provide an essentially planar intermediate product having oppositely located bulges at either faces thereof, the globules being obtained by subdividing said product in parts each comprising a pair of opposite bulges. The invention comprises improved assemblies comprising each an asymmetrical globule having the monolayer of microspheres associated to its essentially bottom face and to its peripheral toroidal side face of a radius of curvature smaller than that of its upper bulging portion exposed for light impingement.

Abstract: A method of making cosmetic contact lenses which alter the apparent color of the iris by employing small light reflecting particles imbedded in a colored transparent matrix.Cosmetic contact lenses as described herein are of a dual purpose to correct the visual errors and change the apparent color of the eye. The material iris pattern is visible through the lens providing a natural appearance.

Abstract: Photopolymerizable composition, especially for dental purposes, which contains as photopolymerizable olefin compounds especially acrylic and/or methacrylic compounds as well as a ketone and an amine as activating substances. The amine has the general formula ##STR1## wherein the symbols have the following meanings: X represents cyan or halogen,R represents the group X--CH.sub.2 --CH.sub.2 -, an alkyl group of 1 to 6 carbon atoms, or a hydroxyl group of 2 to 6 carbon atoms, an acrylic, methacrylic or vinyl group, andR.sub.1 represents a substituted or unsubstituted phenyl, benzyl or styryl radical, orR and R.sub.1 together form an alkylene group of 4 to 5 carbon atoms, the amine being able to be present also in polymeric form if in the monomer R represents an acrylic, methacrylic or vinyl group and/or R.sub.1 represents the styryl radical.

Abstract: An acrylic laminated diffuser panel having a high light-diffusing property is provided, which comprises a laminate of an acrylic resin film having a high light-diffusing property and an acrylic resin plate, wherein the acrylic resin film is integrated with the acrylic resin plate. The acrylic laminated diffuser panel is prepared by laminating the acrylic resin film on the molding surface of at least one of a pair of casting mold parts, casting an acrylic monomer or its partially polymerized product into a space between said pair of casting mold parts, and then, polymerizing the acrylic monomer or the partially polymerized product.

Abstract: An improved heat exchanger for high energy laser mirrors is provided which comprises one or more sections each hot pressed into a desired configuration to define coolant passageways, and subsequently stacked and joined by a suitable means such as diffusion bonding. A surface of one of the sections may either support a laser mirror faceplate or be finished to provide the desired laser mirror surface.

Abstract: A method of bonding a laser mirror faceplate to a substrate involves the use of chemical vapor deposition within coolant passages 12 to form a mechanically strong bond 28 between the faceplate 10 and the substrate 16. The method may also be used for the repair of disbonded sections of laser mirrors without disassembling the faceplate from the substrate.

Abstract: An article of manufacture, including a substrate provided on its top surface with an integrally formed, raised, peripheral edge providing at least a portion of a mold; and a body of substantially transparent composition received within said mold and adhered to the substrate, the composition formed into a dome shape to provide a magnifying lens effect to the top surface. A method of manufacturing an article of manufacture, including the steps of: providing a substrate on its top surface with an integrally formed, raised, peripheral edge providing at least a portion of a mold; depositing an amount of substantially transparent composition in substantially liquid form into the mold and allowing the composition to flow outwardly to the peripheral edge to form a positive meniscus; and curing the composition to harden the composition into a dome shape to provide a magnifying lens effect to the top surface.

Abstract: Polymerizable adducts of diisocyanates and methacryloyl alkyl ethers, alkoxybenzenes, or alkoxycycloalkanes are disclosed. The compounds of the present invention are formed into compositions which are useful as bone cement, fillings for cavities, and orthodontic adhesives. The compositions have improved mechanical properties, low water absorption, and excellent color and discoloration stability, coupled with a high filler content.

Abstract: The invention relates to astronomical mirrors or aspherical gratings which are obtained from a blank which is composed, in one piece, of a thin disc having a reflecting surface and of a cylindrical ring coaxial with the disc which is connected thereto by a semi-fixing. The ring is applied on a rigid support with which it defines a cavity in which a pressure pi is applied while the reflecting face is surfaced along a plane or spherical surface. The pressure pi is then varied, this causing a flexion of the disc.

Abstract: A method of producing a composite of organic resin and inorganic porous particles, preferably for use as a dental restoration material, which comprises impregnating porous inorganic particles with an at least partially hardenable resin material, compressing or otherwise applying pressure in such a way that the particles contact each other and the pressure in the resin is equalized by viscous flow of excess resin through the pores of the inorganic particles, bonding together by hardening of at least a portion of the hardenable resin material, thereby forming a resin structure including a contiguous inorganic phase.

Abstract: A method for making cast precision epoxy resin bodies and an epoxy resin formulation for use therein, the epoxy resin formulation having Component A consisting essentially of from 40 to 70% by weight epoxy novolac polymer, from 30 to 50% by weight vinyl -3-cyclohexene diepoxide and from 0 to 20% by weight 3,4 epoxy cyclohexylmethyl -3,4-epoxy cyclohexane carboxylate and Component B consisting essentially of partially hydrolyzed aryl tetracarboxylic acid dianhydride, preferably partially hydrolyzed pyromellitic acid dianhydride. In the preferred embodiments a tertiary amine catalyst is also included. These components are mixed, just before use, in a ratio of from 20 to 50 parts by weight Component B to each 100 parts by weight Component A.

Abstract: A laser mirror stable at high and low temperatures is described comprising graphite fibers in a glass matrix. The mirror is made by hot pressing a graphite fiber lay-up in a glass matrix in a die having a highly polished mirror replicating surface, the fibers laid up in such a way to produce a central plane of symmetry across the central plane of the composite. In use, the composite requires a separate laser reflecting surface layer. The resulting laser mirror has a low density but no porosity, high elastic stiffness, high strength, high fracture toughness, low thermal expansion, high thermal conductivity and environmental stability.

Abstract: A process for producing three-dimensional, mirrored acrylic products using forming techniques eliminates micro-fracturing of a vacuum deposited reflective metal coating by preshrinking a sheet of acrylic before the sheet is mirrorized and formed into the desired three-dimensional shape. Preshrinking is accomplished by heating the sheet to forming temperature and allowing the heated sheet to cool at room temperature before the sheet is formed. Deposition of the metallic reflective coating is performed after the preshrinking step.

Abstract: A decorative emblem is formed by producing a decorative surface, which may be printed and embossed, on a foil substrate. An integral bezel is then formed around the periphery of the decorative surface. Fluent plastic is cast onto the decorative surface to form a meniscus over it. Upon curing, the plastic cap gives a lens effect to the decorative surface. The decorative emblem may be adapted with several types of different attachment means, such as an edge adhesive strip, for fastening it to the intended surface such as an automobile, appliance, or other object.

Abstract: A pontic having a core constructed from a ceramic material embedded in a metal mass at least a portion of which is itself covered by a layer of porcelain. One or more pins are initially inserted into the core for facilitating placement of the core subsequent to waxing of same into a pattern in the cavity of a mold while the pattern is invested and the metal mass subsequently cast within the investment. The porcelain covering layer can be added to the casting in a conventional manner once the casting has been removed from the mold and cleaned in an appropriate manner.

Abstract: Disclosed is a method of manufacturing coplanar photocouplers comprised of a photo-conductor of transparent plastic material covered with a metal mirrors in which a mosaic of recesses is formed in a sheet of deformable metal by deep drawing and the recesses are then filled with plastic in a liquid form. After curing of the plastic the optical elements thus formed are separated from each other.

Abstract: A method of producing a uniform synthetic coating on a working cast for dental applications which comprises:(A) applying to or introducing in said working cast a first catalyst component which, when initiated by a second catalyst component, effects polymerization of a polymerizable composition;(B) thereafter applying to said working cast said second catalyst component and a polymerizable composition which, when polymerized, forms a resin; and(C) thereafter effecting polymerization of said polymerizable composition to form a film.

Abstract: Dental prosthetic devices, such as artificial teeth, crowns, bridges and replacements for parts of teeth are provided comprising hardened resin dental materials containing at least one polymer and a finely divided inorganic filler, said filler being present in an amount of about 10 to 90% based on the weight of the material and having a particle size within the range of 10 to 400 millimicrons, said materials having an extremely high compressive strength, clear opalescence and a very smooth homogeneous surface.

Abstract: A large scale mirror is replicated to an optical accuracy in the range of 1 arc minute. An optical master is created by annealing an acrylic liner sheet to a steel substrate in the constant presence of a vacuum. The acrylic is optically polished to complete the master. An epoxy layer is formed on the master. A rigid substrate such as a honeycomb sandwich is provided with a surface closely approximating the contour of the epoxy layer. The substrate is placed over the epoxy layer with a small generally uniform interstice therebetween. Elastomeric material is gently introduced into the interstice while avoiding any stresses, and subsequently cured. Backing irregularity print-through is avoided. Thereafter, the rigid assembly is separated from the master by flexing the acrylic liner.

Abstract: A process for the addition of Si-bonded hydrogen to an aliphatic multiple bond in the presence of a platinum catalyst selected from the group consisting of______________________________________ I XPtY, II ##STR1## III APt(Y')X"and ______________________________________mixtures thereof, in which A is a halogen, X is a substituted or unsubstituted hydrocarbon radical having from 1 to 3 aliphatic double bonds which is bonded to the platinum atom via a PtC-sigma bond and a Pt-olefin-Pi-bond, X' is a hydrocarbon radical which is substituted with an alkoxy or acyloxy group and has from 1 to 3 double bonds and is bonded to the platinum atom via a PtC-sigma bond and a Pt-olefin-Pi-bond, X" is a substituted or unsubstituted hydrocarbon having an aliphatic double bond which is bonded to the platinum atom via a Pt-olefin-Pi-bond, Y is a chelate-like bonded beta-diketonate ligand or arylcarboxylate ligand, Y' is a beta-diketonate ligand and Z is a double link bridge ligand.

Abstract: A method contemplated by the present invention for producing semi-finished prosthetic dental preforms essentially comprises the steps of repulverizing a dental porcelain mixture including a suitable binder by spray drying such dental porcelain molding the repulverized dental porcelain mixture in a die member having a cavity with a form generally complementary to that desired for the molded product, removing the molded product from the mold; and applying an outer coating of a suitable second dental porcelain to selected exterior surfaces of the molded product. The binder for the ceramic material comprises 10.5% to 8.5% ethylene vinyl acetate resin, 5.3% to 3.9% mineral seal oil and about 2.2% to 1.6% stearic acid.

Abstract: A denture comprising teeth consisting essentially of hard non-hydrophilic polyurethane elastomer imbedded in and chemically bonded to a gum member consisting essentially of soft non-hydrophilic polyurethane elastomer is prepared from a model assembly consisting of a wax replicate denture (artificial teeth imbedded in a wax pattern) mounted on a mouth model, which assembly is usually provided by a dentist or dental technician after a series of dental impressions, bites, and trials with the patient. A female mold is prepared from the model assembly having a cavity conforming to the wax replicate denture which, together with the mouth model after the wax replicate denture has been removed, forms a denture mold. The hard non-hydrophilic polyurethane elastomer teeth are first cast in the cavity of the mold. The casting is then removed and trimmed of its flash down to the gum line to delineate the shape of that portion of the teeth to be imbedded in the gum portion of the denture and replaced in the mold.

Abstract: A method for forming a layered dental restoration in which there is a continuous polymeric resin phase but in which the reinforcing filler compositions of the respective layers are different. A sub-layer, composed of a polymeric resin binder having a refractive index within the range of about 1.53 to 1.56, in admixture with suitable catalysts and a finely-divided reinforcing inorganic filler having a refractive index substantially different than that of such resin, is first applied to the site of restoration and, before the sub-layer has fully cured, a surface layer composed of the same resin and catalysts but a different inorganic filler is applied to the site over the sub-layer. The filler of the surface layer consists essentially of a finely-divided inorganic material having substantially the same refractive index as that of the resin common to both layers.

Abstract: An improved method of constructing porcelain-metal dental restorations characterized in a substantial reduction in the number of baking steps employed, thereby significantly improving the quality of the finished product by reducing the occurrence of "gassing" and reducing labor costs.

Abstract: Novel bromine-containing compounds of the formula ##STR1## in which R is an alkylidene radical having 1 to 6 carbon atoms, a cycloalkylidene radical or a SO.sub.2 radical, R' is an alkylene radical having 2 to 6 carbon atoms or a cycloalkylene radical and Y is an acyl radical of a carboxylic acid having 2 to 6 carbon atoms and optionally bearing an aromatic substituent, and x is 1 or 2 and y is 0, 1 or 2, which are particularly useful for the preparation of dental replacement parts and dental models when mixed with a substance that catalyzes the polymerization of the compounds.

Abstract: A denture consisting of teeth anchored in a gum member composed of a unitary mass of non-hydrophilic polyurethane elastomer, the tooth-holding portion of which is hard and the mouth-engaging portion of which is soft is prepared by first casting the teeth-holding portion about the teeth and then casting the gum holding portion onto the tooth-holding portion and curing the denture during which the gum-engaging portion and the tooth-holding portion become integrally chemically bonded into a unitary mass.

Abstract: An apparatus for and method of forming a unitary tooth die and stem that is cast as an integral part of a dental stone model and separable therefrom for use as a unitary article of manufacture.

Abstract: A composite material and method of preparing same for use in prosthetic dentistry. The composition includes silica glass containing between about 8.0-30% on a weight basis of alkaline earth metal oxides and/or alkali metal oxides in solution selected from the group consisting of calcium oxide, magnesium oxide, sodium oxide, potassium, and lithium oxide. In one form of the invention, a methacrylate resin is coupled to the silica glass by a silane mixture. The invention includes the method of forming the composite material through both a cold curing system and a heat cured system into a composite veneering and tooth material which is useful in forming crowns and other dental restorations as well as artificial teeth requiring aesthetic appearance of normal dentition. The finally formed dental material shows a high hardness factor in combination with a high wear resistance.

Abstract: Method of making artificial tooth inlays and crowns by electrolytically depositing a metal, preferably gold, matrix on a preformed model and subsequently building up porcelain on the matrix. The matrix may then be removed prior to cementing the inlay or crown to the patient's tooth; or alternatively the inlay or crown may be cemented to the patient's tooth together with the matrix.

Abstract: An artificial implant comprising as its essential ingredients vitreous carbon and an acrylic polymer having substantially the characteristics of polymethylmethacrylate, and the method for making same.