Abstract: A method for manufacturing a fused cast refractory article including the steps of pouring a molten refractory material into a cavity of a mold including a casting sand held by a negative pressure applied through the sand and against a thermoplastic film which surrounds the mold cavity, casting and cooling off the refractory material, wherein the negative pressure is maintained after the casting. The mold includes an upper mold portion including a frame, a casting sand, and a thermoplastic film; a bottom mold portion including a frame, a casting sand and a thermoplastic film; and a cavity defined by the thermoplastic film between the upper and bottom mold portion and having an inlet opening.

Abstract: A method for producing a simulated rock by spraying a high density polyurethane elastomer in a flexible rubber mold. The rubber may be natural rubber or synthetic rubber. A rock is produced in molded form, not limited in size. A flexible mold is prepared by applying numerous coats of liquid uncured rubber forming materials, such as latex rubber, upon the rock exterior in combination with a fabric embedded within the rubber latex layers. A supporting cradle for the rubber mold is produced by spraying a low density urethane foam composition over the mold. The mold and cradle are stripped from the rock and are sprayed with a two component structural urethane system employing an isocyanate component and a polyol component with appropriate catalysts, fillers and additives. The structural urethane elastomer is built up to substantial thickness to provide a strong rigid load bearing polyurethane molded rock simulating the original rock surface with curing taking place in a matter of seconds or minutes.

Abstract: A method of forming from a sintering material slurry a shaped-body to be sintered having a complicated configuration. A mold is prepared using frames, a shielding member swollen with a solvent, and a filler including a substance formed of particles, and utilizing the action of vacuum. A sintering material slurry is poured into the thus prepared mold to form a shaped-body to be sintered.

Abstract: A process for rapidly forming a flexible mold for finely detailed objects from a radiatively curable molding composition includes coating at least a portion of the surface of a three-dimensional object with a fluid molding composition. The coating is cured by exposing the fluid coating to radiative energy to form an elastic, flexible layer of cured molding composition on the object. The coating and curing steps can be repeated to build up the flexible mold until a predetermined minimum has been attained. The cured molding composition is removed from the object, and is suitable for immediate use as a mold to cast duplicate reproductions of the object.

Abstract: Surface mounted circuit components having surface mount leads are mounted upon circuit boards having corresponding patterns of surface mount pads by a procedure wherein a male mold is made by positioning mold defining circuit components upon a transparent spacer which, in turn, is positioned over a circuit board or the equivalent. The transparent spacer is provided having vacuum transmission openings in it and the assemblage is positioned within vacuum forming apparatus to provide a transparent female mold. An arrangement for locating alignment pins may also be developed for the female mold. The female molds are mounted upon a universal back board along with alignment pins and production circuit components are inserted therein. Production circuit boards then are positioned over the female molds and inserted circuit components along with an adhesive for use in subsequent flow soldering connections, or a Re-Flow solder for that form of lead connection.

Abstract: A method to obtain corrected impressions of the foot so as to produce corrective soles including two or three superimposed rigid frames connected to a supporting structure secured by arms of different length joined to the supporting structure. Each frame is equipped with two flexible walls which, along with the frame, delimit a sealed enclosure filled with a granular material, the enclosure communicating with a suction device.

Abstract: A fibrous bone filler having an excellent biocompatibility. The bone filler comprises fibers containing hydroxyl apatite. The hydroxyl apatite is "intact", that is, the hydroxyl apatite substantially retains its hydroxyl groups.

Abstract: A composition for receiving and permanently recording impressions including a plastisol, finely ground non-absorbing particulate matter and a small quantity of salt. The particulate matter is limestone and sand.

Abstract: The design process for a motor vehicle component part by making drawings of cross sections of the part at spaced intervals along the surface. Cardboard templates are cut to the cross sectional shape of the inside of the part, and mounted on a rigid base at the same spaced intervals as the spaced intervals of the cross sections of the drawings to define a skeletal frame. A sheet material such as cardboard is adhesively bonded to the skeletal frame, to define a rough model of the part. This rough model is then layered with glass fiber and bonding resin and finished to the desired outside finished surface dimension shown on the drawing. This provides a finished model of the part, or the glass fibers and bonding resin build up may be removed from the cardboard to be a prototype part. Furthermore, the model may be used to make a mold from which a number of prototype parts may be made.

Abstract: A method for producing simulated rocks by spraying a high density polyurethane elastomer in a flexible mold. The method includes reproducing a rock in molded form, not limited in size. A flexible mold is prepared by applying numerous coats of latex rubber upon the rock exterior in combination with a fabric embedded within the rubber latex layers. A supporting cradle for the latex mold is produced by spraying a low density urethane foam composition over the latex mold. The mold and cradle are stripped from the rock and are sprayed with a two component structural urethane system employing an isocyanate component and a polyol component with appropriate catalysts fillers and additives. The structural urethane elastomer is built up to substantial thickness to provide a strong load bearing polyurethane molded rock simulating the original rock surface with curing taking place in a matter of seconds or minutes.

Abstract: Compact discs are continuously mass produced by continuously rotating a master roller about whose periphery a plurality of optical disc patterns are sequentially arranged in order to form inverse patterns on an elongated film fed to the roller at successive contact locations spaced apart of one another lengthwise of the film during each rotation. Each optical disc has a metallized layer which is protected from damage by the provision of sheets of non-negligible thickness.

Abstract: A method of making precision low cost molds by applying a plurality of layers of material to a pattern. The method includes providing a pattern of the part to be formed; orienting the pattern on a surface plate in a molding dam; applying a release coating to the surfaces; applying a thin resin layer to form the mold surface; applying a layer of fiber reinforced tooling resin to the thin resin layer; applying an epoxy-dry plaster bonding layer to the tooling resin; inserting a reinforcement framework into the dam; and applying bulk casting plaster to complete the body of the mold.

Abstract: Uncured elastomeric sheet material (42) is built up on the outer surface of a production article (36) constructed from composite materials. A vacuum bag system (20, 24, 26, 30, 32) is used for holding the uncured elastomer member (60) against the composite article (36) while the elastomer member (60) is being cured under heat and pressure. Such curing causes the elastomer member (60) to shrink. The elastomer member (60) is then resized by cutting it into sections (66). The sections (66) are placed back on the composite article (36) and each is positioned on such article (36) at a location best conforming to it in shape. This leaves gaps (68) between the sections (66). Additional uncured elastomer (70) is applied to fill the gaps (68) and bridge across the gaps (68), to in that manner splice the sections (66) together. A vacuum bag (20, 24, 26, 30, 32) is again applied and the bag assembly (20, 24, 26, 30, 32 ) is again cured under heat and pressure, to cure the additional elastomer material (70).

Abstract: A method for forming a composite door to custom fit a predetermined door opening. A template is formed by spraying a quick hardening foam on a door jam of the door opening. The template is moved a base member of the tool and the base member adjusted to conform to the shape of the template. A mold is formed using the template and base member. Composite material placed inside the mold and on top of the base member forms a door to custom fit the door opening.

Abstract: A process for producing an information carrier containing recorded audio and/or video information wherein a web of a thermoplastic material is extruded onto the patterned surface of a metal master and pressure is applied to force said thermoplastic material into contact with the metal master. The thermpolastic material is cooled to a temperature below its softening point to form an imaged thermpolastic web which is separated from the metal master. Then a thin film of metal particles is deposited on the imaged surface of the thermoplastic web and said metallized thermpolastic web is laminated with a substrate carrying an uncured coating of a radiation curable resin. The resin is cured and individual information carriers are separated from the web of information carrying laminate. A center hole is placed in the separated individual information carriers, when appropriate.

Abstract: A method for molding powders which comprises introducing a thin-wall resilient mold inside a ventilative mold support, reducing the outside pressure of the ventilative mold support to less than the atmospheric pressure (760 Torr), putting a thin-wall resilient mold exactly close to the inside wall of the ventilative mold support, supplying powder material into the thin-wall resilient mold, exhausting air existing in the voids formed in the powder material, and taking the ventilative mold support apart to apply cold isostatic press treatment to the thin-wall resilient mold. The shape of the thin-wall resilient mold is similar to the shape of the ventilative mold support.

Abstract: A method of forming a substrate for manufacturing single crystal thin films, wherein the substrate is a replica pattern of a monocrystalline or single crystal cleavage plane. Such replica pattern may be formed by pressing a material in a softened state against the cleavage plane of the single crystal, with subsequent hardening, and also, by subjecting the single crystal cleavage plane to vapor deposition or plating, and thereafter removing the formed layer from the single crystal cleavage plane.

Abstract: A data storage medium is provided which is suitable for production or replication by moulding, casting, embossing or a similar process against a tool. The method for manufacturing a data storage medium has a surface or a surface region which is strongly absorbent of at least a predetermined band of wavelengths of electromagnetic radiation. The surface or surface region includes a layer of a heat sensitive material which has a textured surface pattern the pitch of which is smaller than the shortest wavelength of the predetermined band of wavelengths, and the depth (peak-to-trough) of which is at least 100 nm. The surface pattern is free from undercutting, and can comprise an array of protuberances or one or more sets of grooves (which may be intersecting). The textured surface pattern is further coated with a thin film of a high-opacity material, e.g. gold, the thickness of the overcoating preferably being such as to give no more than 10% transmission of incident radiation.

Abstract: A process for producing molds, models and tools from hard gypsum and/or cement including applying at least one base layer composed of a binder to a model from which a mold is to be made and which has been provided with an unmolding agent, and pressing onto this base layer a glass fiber reinforced molding composition composed of 95 to 0 weight % .alpha.-calcium sulfate hemihydrate, 0 to 95 weight % cement, 0.5 to 8 weight % glass fibers and 0.5 to 4 weight % suspension agent, with reference to the dry weight, as well as water in a wet-on-wet process and unmolding the resulting laminate after it has set.

Abstract: The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of a transparent substrate and has a readout side and opposite side (back) which at least in the information zone has a reflective coating. The light entering the outer zone from the readout side is reflected at least partially diffusely or absorbed by the information carrier. In this way, manufacturing defects such as, for example, inclusions, inhomogeneities etc. are at least partially masked or concealed.

Abstract: A method for manufacturing a flat illumination unit provides light guide channels in the form of transparent rods arranged in lines on the upper side of a plate. The upper side of a plate is coated with a casting compound and, after hardening of the casting compound, the plate is eroded from the opposite side until only the light guide channels remain respectively surrounded on three sides by the casting compound and therewith form a film.

Abstract: The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of a transparent substrate and has a readout side and an opposite side (back) which at least in the information zone has a reflective coating. The light entering the outer zone from the readout side is reflected at least partially diffusely or absorbed by the information carrier. In this way, manufacturing defects such as, for example, inclusions, inhomogeneities etc. are at least partially masked or concealed.

Abstract: The process for fabricating a reusable artifical fingernail which enjoys a tight tolerance complimental fit with the natural nail substrate as a result of the method of fabrication. The process may involve the use of, (A) the natural nail [Direct Technique], of (B) a model of the natural [Indirect Technique] as a substrate in conjunction in each case with a secondary substrate forming an extension of the nail, and digit to accept in a continuous fashion a release agent and a coating of a curable material forming an artifical nail curing the acrylic material, preferrably by blue light source in the visible spectrum. The preferable material is an acrylic and removing the artifical nail so created, trimming flash and shaping it to the desired final configuration and reapplying with a non-permanent adhesive material.

Abstract: A method of preparing a template for a product from a sample of the product. The ultimate template is either larger or smaller in size than the sample. Initially, a mixture of liquid rubber and a curing agent is prepared. The sample is then covered with the mixture and the mixture is permitted to harden to form a temporary mold. The sample is then removed from the mold to form a cavity, and the size of the cavity in the mold is altered to either increase or decrease its dimensions. Finally, a hardenable material, such as an epoxy resin, is poured into the mold to form the template. If an enlarged template is to be formed, the size of the cavity of the mold is increased by immersing the mold in an organic solvent bath. If the size of the mold is to be decreased, an organic solvent is added to the mixture before formation of the mold, and after the mold has been formed, it is heated to shrink the size of the mold.

Abstract: A method of making a laminated structure for use in an electrical apparatus. A female mold is produced having an upwardly facing cavity of a shape corresponding to the laminated structure. A layer of a ferrous metal is sprayed onto the bottom surface of the mold and subsequently an electrically insulated layer is applied to the layer of metal. Alternate layers of the ferrous metal and the insulating layer are deposited in the cavity of the mold to provide a laminated structure in which the metal and insulating layers are integrally bonded together. Through use of the method of the invention, a ferrous metal with the most desirable electrical characteristics can be employed.

Abstract: Concrete elements, such as blocks or bricks, are molded or cast by forming in a primary mold cavity a secondary mold made of a portion of a thermoplastic film which has been contacted with a flat heater surface to assure a uniformly heated film portion which is then sucked into the primary mold cavity without wrinkles and filled with concrete mix. The secondary mold with the concrete mix in it is withdrawn, for example, sucked out of the primary mold cavity well before any effective hardening of the concrete mix, so that curing and hardening takes place in the secondary mold outside the primary mold cavity. This early withdrawing is important because it avoids expansion of the curing mix in the primary mold, whereby removal from the primary mold is facilitated. Additionally, the early removal with the aid of the secondary mold assures a more efficient use of the primary molds which are used again while the hardening is still going on in the secondary mold.

Abstract: A metal mold for tire vulcanization comprising a tread pattern mold obtained by piling up and fixing a plurality of laminas in order; the laminas have molding portions corresponding to sectional shapes of a tread portion or an outer surface of a tire, the sectional shapes are obtained by slicing a tire in lamina-shape parallel to an equator plane of the tire.The metal mold of the present invention can be manufactured efficiently since the provision of working data and the working become easy. Furthermore, the mending of the metal mold resulting from partial defects and the partial change of the metal mold are easy since the metal mold of the present invention is not an integral but laminate construction.

Abstract: The invention is a flexible mask for use in charging a flowable material into selected cells of a honeycomb structure and is of particular utility in chraging a sealing material into the ends of selected cells of such a structure during fabrication of solid particulate filter bodies and other selectively plugged honeycomb structures. The mask has a central body with a set of openings extending therethrough which allow passage of the flowable material through to the selected cells and a second set of protrusions extending from one of the surfaces of the mask which are used to align the mask to the end face of the structure and which extend into and sealably cover the cells which are not to receive the flowable material. The mask may be formed from a polymer, preferably an elastomer, using any of three disclosed die apparatuses.

Abstract: Process for photofabricating master relief patterns from photohardenable layers, e.g., 0.01 to 0.5 inch (0.25 to 12.7 mm in thickness) which comprises: (1) exposing the layer through the back surface to first imagewise modulated actinic radiation for time to render layer insoluble to first preselected depth which when measured from back surface to less than layer thickness, (2) exposing overall to actinic radiation through back to render layer insoluble to second preselected depth which when measured from back surface is less than first preselected depth. (3) exposing imagewise through front surface to actinic radiation for a time sufficient to render exposed areas of layer insoluble to depth extending from front surface to at least second preselected depth, and (4) solvent removing soluble areas of layer.The master relief pattern is useful in making casting molds.

Abstract: A process of making a full life size artificial rock formation of photocopy exactness from a natural rock formation surface is disclosed herein. A plurality of coats of latex is applied over the natural rock surface and allowed to dry thus forming a mask having all the natural cracks and crevices of the natural rock surface. This mask or liner is held in a fiberglass mold and a vacuum is applied to the inner surface of said liner causing all the cracks and crevices to open up. Cement is applied to the outer surface of the liner filling all the cracks and crevices. When the liner is removed the artificial surface resembles the natural rock surface in photocopy exactness.

Abstract: The present invention provides a fibrous product of apatite comprising one or more apatites selected from a group of apatites represented by the general formula:M.sub.10 (ZO.sub.4).sub.6 X.sub.2wherein M represents Ca, Ba, Mg, Sr, Pb, Cd, Fe and the like, ZO.sub.4 represents PO.sub.4, AsO.sub.4, VO.sub.4, CO.sub.3 and the like, and X represents F, Cl, OH and the like. This fibrous product of apatite has many applications such as uses for medical treatment, large scale microorganism cultivating media and others, and particularly it is useful as apatite implant materials having a good compatibility with living organism and superior workability.A fibrous apatite product of this invention may be produced by a method comprising the steps of:(a) preparing a dispersion of apatite by dispersing fine apatite particles uniformly in a solution of binder in water, said apatite being one or more apatites selected from a group of apatites represented by the general formula:M.sub.10 (ZO.sub.4).sub.6 X.sub.

Abstract: An improved method of forming a decorative panel of molded plastic comprising the steps of constructing a form having a detailed masonry surface; covering the detailed surface with a mold release material; applying a thin layer of gel coat over the mold release; applying a plurality of layers of fiberglass matte and resin over the gel coat layer; allowing the plurality of fiberglass matte and resin layers to harden thereby forming a heat resistant mold having a female side being formed against the detailed surface and a side opposite from the female side; removing the mold from the form; perforating the mold thereby providing fluid communication between the two sides; connecting a vacuum apparatus to the side opposite of the mold; placing a sheet of high impact plastic above and adjacent the female side of the mold; activating a heater thereby heating the plastic sheet to a pliable state; activating the vacuum apparatus thereby drawing the plastic sheet into the female side of the mold; and removing the forme

Abstract: A thread of a fluid material for gasket manufacture is deposited onto a non-planar, non-adhesive support sheet (12) from a nozzle (22) that is displaced above the support along a path corresponding to the outline of the gasket, with subsequent curing of the fluid material. The support sheet is prepared by pressing sheet material into a tridimensional shape whereby its surface contains the non-planar outline of the gasket to be manufactured; the shaped support is positioned with respect to a nozzle carried by a manipulator (20) capable of being controlled to move the nozzle with respect to the support along three independent spatial coordinates; and the nozzle is fed with said fluid material while being displaced along said non-planar outline. Preferably, the support sheet is kept flattened by vacuum against an underlying, matching surface.

Abstract: A process for making at least a single-faced, write and/or read optical disk having a sub-layer with a smooth or high-resolution featured surface and the opaque, substantially flat substrate includes the steps of interjecting between the opaque, substantially flat substrate and a transparent, highly polished or featured master mold, a thin layer of viscous composition which is radiation-curable to a solid plastic without undergoing significant shrinkage. The layer of viscous composition is irradiated through the transparent mold to cure the composition to a solid plastic sub-layer having the desired smooth or high-resolution featured surface. After irradiation of the composition, the master mold is removed, leaving the cured plastic sub-layer adhered to the substrate. The substrate is preferably metal, such as aluminum, and the master is preferably glass with an etched featured surface thereon.

Abstract: A pin thread profile mold includes two parallel spaced apart plate type thread profile gages. A cast is made with the mold positioned adjacent the thread with the plates parallel to the thread axis and the plane midway therebetween radial to the thread axis, the mold-thread interface being caulked with clay. After being placed adjacent the thread the mold is packed with self hardening plastics material in the plastic state, such as dental plaster. After the plastics material has hardened the cast is removed from the thread and sent to a laboratory for comparison with a desired profile.

Abstract: An apparatus and method for cold retreading or recapping of the running surface of a vehicle tire. A rubber, rope and cloth mold larger in diameter than the recap tires produced in it is produced utilizing a new tire male mold covered with perforated polypropylene film, uncured rubber with nylon rope at its edges and highly stretchable cloth enclosed in an envelope and cured by application of pressure and heat. A larger male mold is used to make the final female mold directly, or a like-size male mold is used to make an intermediate mold which is used to produce a tread ring that is stretched to form a larger diameter male mold from which a final mold is prepared. The somewhat flexible, compressible final female mold thus produced is then utilized in recapping tires by positioning it around a prepared tire carcass coated with cement, a layer of uncured rubber, and a sheet of perforated polypropylene film.

Abstract: A method of effecting practical, simple and economical production of ore-concentrating pads of numerous configurations and sizes. Nails are employed to secure extruded strips to a backing sheet and an underlying support, following which the strips are pivoted about the nails and progressively secured to the backing sheet. The nails are then removed and the resulting pad is vacuum-applied to a concave bowl and adhesively secured therein. The shapes and positions of the strips are such that there is very close sealing engagement beween adjacent strips, after the pad is made into bowl shape, yet there is great elasticity permitting practical vacuum application to the bowl. In one embodiment, the strip-formed pad is used as a mold over which plaster of paris is molded, and the plaster of paris is used as a guide for a tracing machine adapted to make a mold for the mass-manufacture of large numbers of concentrating pads.

Abstract: A plastic caul for embossing wood panels with grain patterns comprises a laminate of sheets of epoxy prepreg made of such heat insensitive non-cellulosic webs such as fiberglass or woven graphite impregnated with partially cured epoxy resin. The caul may also include a metal core or backing sheet. The embossing face of the caul contains a relief design, usually transferred from a natural wood grain pattern.To form the caul, a mold is first prepared. The mold may comprise a textured wood panel, the grain surface of which has been sealed with a material such as urethane varnish or a water reducible imine catalyzed acrylic varnish with a urethane additive. The sealed textured face is then coated with a release agent. This treatment prevents the panel and future caul from sticking together. Sheets of the epoxy prepreg are then layered between the treated surface of the panel and a backing sheet and compressed under heat and pressure until substantially cured.

Abstract: Foil (aluminum) is placed on a backing member (styrofoam), and depressions made in the foil and backing member, and those members become set and hold the depressions. The depressions are made in a pattern to form a picture, and plastic materials are placed in the depressions, that are transparent, and of different colors, and have convex shapes above the top of the depressions, acting as lenses. The depressions are made by the finger, a stylus, or a toothpick. In another embodiment, the backing member is relatively rigid, a stencil having cut-out areas representing a picture is placed over the backing member, and the foil over the stencil, and the depressions are made by following the stencil. Another embodiment includes a shaping form with raised elements over which the foil is placed; both are placed in a mold, and styrofoam in fluent form placed over the foil and enabled to expand, the styrofoam then constituting the backing member. This forces the foil against the shaping form and forms the depressions.

Abstract: An apparatus and method for cold retreading of the running surface of a vehicle tire. A rubber and cloth mold is produced utilizing a new tire male mold covered with perforated polyethylene film, uncured rubber and highly stretchable cloth enclosed in an envelope and cured by application of pressure and heat. The somewhat flexible female mold thus produced is then utilized in recapping tires by positioning it around a prepared tire carcass coated with cement, a layer of uncured rubber, and a sheet of perforated polyethylene film. The mold and tire assembly is then enclosed in an envelope, and like assemblies are placed in a chamber where curing of the rubber layer is accomplished by inflation of the tire carcass, evacuation of the envelope, pressurization of the chamber and application of heat.

Abstract: A method of molding stone-faced pillars comprising attaching stone pieces onto a wooden base, covering the surface of said base, not covered by the stone pieces, with Plaster-of-Paris, spraying numerous coatings of latex rubber on the entire base and stone pieces of the pillar and spraying numerous coatings of liquid base fiberglass on said coatings, peeling off said coatings, and laying them in right angular relationship in a right angular mold and finally pouring wet cement onto the stone-faced portions to reproduce the stone faced pillar model.

Abstract: The disclosure relates to a method of manufacturing a gas turbine rotor or stator using elastomeric rings for the retention of the rotor or stator blades in a core mold. The elastomeric rings are split to facilitate disassembly thereof from the blade core which is thereafter utilized in a cope and drag casting system.

Abstract: A mold, useful in preparing Tiffany-like lampshades, terrariums and glass lamp bases is described. The process for preparing this mold, which produces sections of a 360 degree unit within which the assembler works, is also described.

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: The process is used for producing grooved plates for adjustable chokes, such plates having a choke groove in one side whose change in cross-section along the length of the groove has to be very true, that is to say, keep to very tight size limits. For producing such grooved choke plates of synthetic resin to accurate size in a mold, the first step is cutting an undersize groove in a plate workpiece to make a positive pattern. The plate workpiece is then placed in a choke housing and the flow properties of the choke are measured. Thereafter, further machining of the plate workpiece is undertaken on the basis of the difference between the desired and the actual choke properties of the plate, and at the same time taking into account shrinkage of the synthetic resin on cooling down and becoming solid in an injection mold which is to be later produced as a negative pattern from the positive pattern.

Abstract: A method of effecting practical, simple and economical production of ore-concentrating pads of numerous configurations and sizes. Nails are employed to secure extruded strips to a backing sheet and an underlying support, following which the strips are pivoted about the nails and progressively secured to the backing sheet. The nails are then removed and the resulting pad is vacuum-applied to a concave bowl and adhesively secured therein. The shapes and positions of the strips are such that there is very close sealing engagement between adjacent strips, after the pad is made into bowl shape, yet there is great elasticity permitting practical vacuum application to the bowl. In one embodiment, the strip-formed pad is used as a mold over which plaster of paris is molded, and the plaster of paris is used as a guide for a tracing machine adapted to make a mold for the mass-manufacture of large numbers of concentrating pads.

Abstract: A chocolate candy having its upper surface sculpted as the image of a person's face and a method for sculpting a person's face from a photograph onto a chocolate candy by adapting a photographic image of a person's face, converting the adapted image onto a transfer medium or die, and then embossing such adapted image onto chocolate candy.

Abstract: A uniform thin replica film of a specimen for electron microscopy having a high resolution power such as approximately 1 .ANG. is presented. This uniform thin replica film is directly prepared on the specimen by a plasma polymerization technique by depositing organic monomer vapors on a specimen placed on a negative electrode in a high vacuum atmosphere. The deposition is carried out by applying a discharge voltage of from 0.5 to 3 K.V.D.C. between a pair of positive and negative electrodes for 1 to 15 minutes to effect a glow discharge under the conditions of a current density of the glow discharge of from 0.1 and 2 mA/cm.sup.2 and a gas pressure of from 1 to 10.sup.-2 Torr in the system.

Abstract: A method of making preforms from brittle metals for brazing or hardfacing consists of pulverizing the metals into a powder, mixing the powder with a liquid vehicle to form a paste, passing the paste through a coated screen having an opening in the coating with the size and shape of the desired preform, depositing the output of the screen onto a substrate and thereby making the preform, heating the preform to evaporate the liquid vehicle, and removing the preform from the substrate. The opening in the screen coating is made by exposing a photo-sensitive film to light through a photographic negative or similar mask having the image of the preform and chemically removing a portion of the film to form an opening having the shape of the preform, the film being mounted on the screen either before or after such exposure.

Abstract: This disclosure is directed to strengthening carbon-black particulate "Teflon" (PTFE) mixes destined to be formed into active layers in air cathodes, which comprises mixing an aqueous dispersion of particulate polytetrafluoroethylene with an aqueous suspension of particulate carbon-black; washing and drying; mixing with a pore-forming agent; fibrillating said mixtures; washing and drying; adding polytetrafluoroethylene fibers while chopping said dried fibrillated mixture and thereafter forming said chopped mixture into a sheet, which was washed and dried.