Abstract: A process for pressure molding an article around a hardened salt mold core made from a mixture of relatively low melting temperature salt and sand wherein the core is removed from the finished article by immersion of the article containing the core into a molten bath mixture of the core material thereby to melt the core out of the article, recover the core material, and thus replenish the bath for use in making additional cores. The bath is originally constituted by melting a suitable quantity of a dry premix of the salt and sand.

Abstract: The invention relates to a method of making a hollow frame for a games racket by injection moulding of fibre-reinforced thermoplastics material around a fusible core. The core is formed with holes through it corresponding to the desired stringing holes. The core holes are stepped so that the hole in one face of the core is larger than the hole in the opposite face. A stepped mould pin is inserted through each hole through the core, the pins being of such dimensions that the bore of the larger hole is completely filled giving positive location but the bore of the smaller hole is of greater diameter than that of its corresponding portion of the pin. Injection of the thermoplastics material, followed by setting of that material and then removal of the core results in a product having reinforcing tubular projections inwardly from one wall of the hollow frame.

Abstract: A method for producing concrete products provided with inlaid patterns includes (a) preparing a reusable mold provided with recessed patterns by applying ultra violet rays on the surface of an ultra-violet-ray setting resin plate, (b) preparing a waste mold provided with recessed patterns from the reusable mold, the waste mold being made of a soluble material which can be dissolved by water, solution or heat, (c) casting concrete into the waste mold and solidifying the concrete to provide a concrete block on the waste mold, (d) dissolving and removing the waste mold from the concrete block and providing recessed patterns on the surface of the concrete block, (e) filling a coloring material into the recessed patterns on the surface of the concrete block and solidifying the coloring material, and (f) grinding the surface of the concrete block to produce concrete products provided with inlaid patterns on the surface thereof.

Abstract: A process for producing a sturdy refractory metal oxide articles includes the steps of heating a substrate or organic material impregnated with a metal nitrate compound in an atmosphere in which the partial pressure of oxygen is less than two mm Hg to increase the temperature of the substrate at a rate of at least two degrees Celsius per minute to thermally decompose the metal nitrate compound as a step in the conversion of the metal nitrate compound to a refractory metal oxide such that evolved oxides of nitrogen interact with the organic substrate material to partially oxidize the organic substrate material.

Abstract: A preformed pattern for forming an occlusal splint comprises a U-shaped member composed of material that is form-stable at room temperature and sufficiently pliable at an elevated temperature to be conformed to the bits of a person's jaw or to a model of such person's jaw.

Abstract: A solvent soluble plastic form (104) is molded around a spring-type battery contact (102) such that one end (102A) of the battery contact projects from the form. A one-piece injection molded thermoplastic housing (202) is then molded around the battery contact and form, thereby molding the end of the battery contact into the housing. The soluble plastic form is then dissolved in an appropriate solvent, leaving a housing with a cavity (202D) that contains the battery contact.

Abstract: A method for the manufacture of a mold out of mold material from a previous blank by machining each blank into a desired shape by means of a machine tool controlled by a computer utilizing a dimensioning data set. Each blank is manufactured by feeding an organic polymer material whose melting point is preferably lower than 150.degree. C. in liquid form into a box-shaped container which is open at the top and which corresponds to the dimensions of the desired mold. Waste polymer material from the blank upon machining is recovered and heated to a temperature higher than its melting point, whereupon it is fed onto an existing mold no longer needed, so as to provide a new blank for a new mold.

Abstract: Apparatus for molding hollow metalwood golf club heads of wax or other material with variations in the lie angle of the neck or hosel relative to the body of the club head, in which two molds with communicating mold cavities are supported for turning of one mold about a pivotal axis to change the angular relationship of the two cavities. The molds have arcuate abutting surfaces coaxial with the pivot for effective meeting relationships in the different positions, the hosel base being slightly oversize to accommodate the displacement, and two core pieces in the molds have part-spherical abutting surfaces, also coaxial with the pivot for effective "kissing off" of the parts. The movable mold is detented in one of eight different positions, in one-degree increments. Another embodiment produces solid-headed irons with selected different lie angles of the hosel, but with only one core piece, which is in the hosel mold.

Abstract: A method for forming a cast replica of an article, including: forming an outer mold around the article with a first molding material, the outer mold having an inner surface substantially conforming to the outer surface of the article; separating the article from the outer mold; applying to the outer mold on its inner surface a predetermined thickness of a second molding material which is separable from the outer mold, the second molding material defining a hollow space at the interior thereof; filling the hollow space with a third molding material separable from the second molding material; allowing the third molding material to cure to form an inner mold; separating the second molding material from the outer mold and the inner mold; locating the inner mold or a reproduction thereof within the outer mold with a space between said outer mold and the inner mold representing the predetermined thickness; filling the space between the inner mold and the outer mold with a fourth molding material; allowing the fourt

Abstract: A method of destroying a brittle body by molding around an elastic tube or an elastic tube in which is inserted a plastic wire or a heat-fusible member for defining a charging hole where the member or tube is partly exposed at the surface of the brittle body, and, after pulling out the elastic tube or fusing the heat-fusible member, an expandable splitting agent capable of expanding by hydration is charged into the charging hole and subjected to hydration-expansion to destroy the brittle body. In another form, a water-impermeable film enclosing an expandable splitting agent capable of expanding by hydration therein is previously buried in a brittle body in a relation partly exposed at the surface of the brittle body, and, after aperturing the exposed end of the water-impermeable film, the expandable splitting agent is subjected to hydration-expansion to destroy the brittle body.

Abstract: A cast article having a complicated shape of the appearance and the hollow can be obtained by forming a coating film on the surface of a pattern from a solvent-insoluble material to prepare a mold pattern, filling and hardening a molding material around the mold pattern, dissolving the pattern with a solvent, and removing the residue of dissolution and the coating film outside the mold.

Abstract: A mold forming method in which a pattern is made of an organic material such as foamed polystyrene and at least a portion of the outer or inner surface of the mold pattern is covered by a thin coating, and surrounded with a mold material. The pattern is then dissolved by a solvent, leaving the coating undissolved. The coating is finally removed by a solvent contained in a slip which is poured into the cavity provided with the coating.

Abstract: A method of forming a bezel that contacts and/or substantially envelops a gem without altering the same is presented. A replica of the gem is initially formed about which a temporary bezel is crafted having the desired artistic markings thereon. In a lost wax process, the temporary bezel is replaced by a permanent bezel. Then the replica is destroyed. In another aspect of the present invention, a replica mold material for use in this process is also disclosed.

Abstract: Methods are set forth for fabricating a concrete panel with embedded glass block. According to the invention the panel form includes at least one partially anchorable support form, i.e., a support form having an anchorable portion and a removable, nonanchorable portion. After concrete is poured into the panel form and hardened, the nonanchorable portion of the support form is removed. A noncementitious band (or collar), of which the anchored portion of the support form is comprised, remains. The glass block is then inserted within this band. According to the preferred embodiment of the invention a rubber seal may be inserted between the glass and noncementitious surface to both waterproof the panel and cushion the block to improve the completed panel's ability to be handled and transported without damage. Furthermore, the invention teaches utilizing the support form to create at least one support lip. Each lip may be formed as part of the anchored band or as part of the formed concrete panel.

Abstract: A method of producing a site for tissue ingrowth on a surgical implant by embedding a space occupier possessing a desired pattern in the surface of the implant at the desired location for ingrowth and then solubilizing the embedded space occupier to leave the pattern on the implant surface. Preferably, the implant is fabricated from a composite comprising a semi-crystalline thermoplastic resin such as polyetheretherketone or polyphenylene sulfide, and the space occupier is an acid-soluble metal plate machined to produce the desired pattern and removed by aqueous acid solution.

Abstract: A process for making an article having an irregular internal passage utilizes a hollow polymer preform. The preform is filled with a relatively incompressible filler material such as a powder or a fluid, which supports the preform when it is placed in a mold, e.g. an injection mold. The filler enables the preform to withstand high molding pressures and prevents deflection and movement of the internal passage within the preform. The shell, a layer of a polymer material is then molded about the preform. After the final article has been formed, consisting of the preform and shell, the filler is removed for possible reuse.

Abstract: The invention provides improved intraocular lens structures for surgical placement in the eye, the unique structures comprise an optical zone portion substantially centrally disposed with an integral outer haptic portion. In one embodied form, the haptic portion is composed of materials having relatively high temperature resistance such as polyimide material, and can be fabricated in a wide variety of engineered configurations. In a presently preferred embodiment, the haptic portion includes an anchoring strut in an arcuate configuration having an oblique face directed to the center of the optical zone portion. The invention further provides methods for insert molding of haptic portions to optical zone portions of the lens structures without conventional secondary operations such as drilling sites in the optic for insertion and welding of haptics.

Abstract: Disclosed is a method of fabricating a prosthetic member (112) having personalized features of the patient, and being formed to provide an individualized fit to the patient's extremity (18). A rigid jacket (30, 32) is first formed around the uninsured foot (10) and the amputated extremity (18). The limb characteristics are impressed into an alginate (44) lining within the jackets (30, 32). A stone material poured into the alginate lining (44) forms stone models (48, 50) of the patient's limbs. A wax preliminary model (64) is scuplted in the likeness of the stone foot model (48) and used to form final stone mold halves (100, 102). The contour of the stone extremity model (50) is adjusted according to the tissue texture of the patient to provide an individualized fit. A gelatinous silicone is injected inside the final mold (100, 102) and allowed to form around the extremity model (50) to thereby provide the body of the prosthetic member (112) and the conformal sleeve (132 ).

Abstract: A hearing aid including a plug that is tailored to snugly fit into the auditory canal of the user's ear, and that has a preshaped component assembly embedded therein, the component assembly comprising shell-like members that are interconnected to each other and that have the electrical components of the hearing aid mounted therein, the members being prearranged to achieve a configuration generally similar to the shape of the plug and being secured in end-to-end position for mounting interiorly in a negative impression in a mold as formed from the user's auditory canal, the assembled members being embedded in the negative impression in the mold upon pouring of a quick setting plastic material into the negative impression, thereby permanently fixing the preshaped assembly in the plug that is formed as the quick setting plastic material hardens around the assembled preshaped members.

Abstract: An apparatus for obtaining a pressure tight seal around the ostium of a blood vessel branch by clamping to the parent blood vessel or duct wall without deforming the branch. The apparatus may then be used for the injection of a hardenable material such as a polymerizable liquid plastic or a hardenable radiopaque liquid. When the blood vessel or duct is completely filled and the injected material has hardened, the original blood vessel or duct tissue can be removed by corrosion. An accurate replica of the blood vessel or duct is then obtained. The replica may be studied as part of a postmortem examination or used for instruction. If the radiopaque liquid has been used, the replica may be studied by the use of x-rays.

Abstract: Ceramic porous bodies, including ceramic foam filters and smooth-faced ceramic objects, e.g., ceramic foam bricks, ceramic foam melting crucibles, and ceramic foam cores, made in accordance with the present invention are suitable for use with molten metal in general and molten superalloys in particular. The invention also provides a tundish for use with ceramic foam filters to filter metal en route from a metal furnace to a casting mold, and a melting device for use in casting metal which employs a ceramic foam filter as a bottom pour valve for a melting crucible such that the ceramic foam filter valve regulates the flow of molten metal therethrough in order to permit an entire ingot of metal to melt in the melting crucible before any metal begins to pour from the melting device into a casting mold.

Abstract: An ultra-light structure is produced by continuously molding a greensand core, forming a material in the mold pattern in the core which solidifies to form a solidified framework, and removing the greensand core.

Abstract: A shrinkable foam mandrel that can be easily removed and composite resin transfer molding process that uses the foam mandrel. The foam is dimensionally stable at a first temperature that typically corresponds to the cure temperature of the composite resin. The foam is capable of irreversibly shrinking to less than about 0.5 said foam's original size at a second tempertaure that is above said first tempertaure. The foam is encapsulated by a non-stick elastomer skin and covered with fibers. The fiber covered elastomer encapsulated foam is disposed in a female mold cavity and resin is injected into the female mold cavity. The resin and fibers are cured and the resulting composite component is removed from the female mold. The temperature is raised to the second temperature and the elastomer encapsulated foam male mandrel irreversibly shrink to less than about 0.5 its original size. Finally the shrunken male mandrel is removed from said composite component.

Abstract: A method of forming a heat resistant gas transfer line. The line includes a metal outer shell, a tubular inner liner formed of a plurality of prefired refractory rings joined together by shiplap joints having expansion gaps, and an intermediate liner including bubble alumina concrete filling the annular space between the inner liner and the outer shell.

Abstract: First and second clamshell-shaped foam members are mated, the first and second foam members meeting along exteriorly exposed joint margins defined by mateable surfaces extending along opposite sides of each of the members. At least one other foam member is nested totally within the mated assembly of the first and second members and nested without joint margins exposed to the exterior of the mated assembly. The surfaces enclosed within the mated assembly pilot the first, second and other members into mating relationship. The first and other members are adhesively bonded together and the second member is adhesively bonded to the assembly of the first and other member.

Abstract: A method of making jewelry or the like to enhance the retention of a gem to a retaining bezel area of the jewelry, comprising the steps of obtaining and utilizing the gem as a model initially, casting the gem in a moldable material, allowing the moldable material to set, dividing the set moldable material into segments to expose the gem, thereby providing a recess in at least two divided moldable material segments thus formed, removing the gem to expose the recesses, casting into the recesses a material which is soluble in the presence of a fluid so that the cast material has an external configuration of the gem when set, allowing the cast material to set, removing the cast material from the recesses of the moldable material, crafting a temperature sensitive substance about the cast material to form the bezel area and attendant jewelry, removing the set soluble material in the presence of the fluid, vaporizing the temperature sensitive substance with molten material using a lost wax process, allowing the molt

Abstract: The addition of the metal drier to the phenolic urethane binder enhances the breakdown of the binder when the system is subjected to the elevated temperatures caused by pouring the molten metal into the mold and enhances the subsequent shake out of the sand from the cores and molds.

Abstract: A process for forming a hollow, cured composite article. The process includes steps of making a plug from a meltable material. The plug is covered with a polymerizable material and the covered plug is inserted into a cavity formed in a thermally-expansive and heat-resistant polymer held within a rigid container. The almost filled container is covered and the container and part are heated to cause curing of the polymerizable covering. The cured assembly is removed from the thermally-expansive and heat-resistant polymer and heated to an extent sufficient to melt the core.

Abstract: A one-piece, hollow, moulded head for a golf-club of the "wood" or "driver" type is made by injecting a thermoplastics material around a fusible core having a melting-point below the injection temperature, allowing the injected material to set and melting out the core.One or more holes are provided, the holes extending completely through the core, so that the injected material fills each hole and sets therein to provide corresponding internal "struts" in the moulding.The injected material may be, e.g., a polyamide, a polycarbonate, a poly(phenylene oxide), an acetal resin or an ABS resin. The material may be reinforced with up to 50% by weight of glass and/or carbon fibres.The moulded head may optionally be filled with a polyurethane foam.The finished moulding may have the conventional face-pieces and/or sole-plates attached thereto.

Abstract: This invention relates to a process for the production of an implant of metal or plastics material having an open-celled structure as a bone substitute. The process uses a connectively open-celled pattern material having a spatial grid or lattice network structure, the cells or pores of the material being defined or formed by very fine thin interconnected threads or cords. The thin threads are coated by a wax-water emulsion which is combustible and vaporizable. A stabilization of the coating may be performed by spraying-on of a hardening and vaporizable synthetic material lacquer, which is deposited on the wax coating. A core material is introduced into the residual hollow spaces of the pattern, which is consolidated by heat, the pattern material being burnt and vaporized while doing so, together with the adhering material and the lacquer without leaving behind any residues, so that the cavities formed in the core may be filled with the implant material and the core material is finally removed.

Abstract: In order to prepare thermoplastic polyurethane elastomers(a) organic diisocyanate,(b) polyhydroxyl compounds with molecular weights of 500 to 8,000, and(c) chain extenders with molecular weights of 60 to 400 in the presence of(d) catalysts, and optionally(e) auxiliaries, and/or(f) additivesare reacted in two reaction stages at temperatures from 60.degree. C. to 250.degree. C. In the first reaction stage the components are continuously mixed, the reaction mixture is applied to a carrier, preferably a conveyor band of thermoplastic material, and is allowed to react at the reaction temperature until solidified. Subsequently, the solidified reaction mixture is melted in an extruder and the reaction is completed in the second reaction stage.

Abstract: In a method of installing a septum (18) at a desired depth within a section of honeycomb core (12) for use in a sound attenuation panels, the septum is sandwiched between two layers (20, 24) of support material having a melting temperature intermediate between the fusing and curing temperatures of the septum material. The honeycomb core (12) is pressed into supporting materials and septum to segment and position the septum (18) therein, after which the resultant assembly is heated sufficiently to allow the septum to fuse and adhere to the honeycomb core. The resultant assembly is then heated sufficiently to melt the support material and allow it to be drained away, leaving the segmented septum (18) in place within the honeycomb core.

Abstract: A process for forming reinforcing layers or films on the complicated configured interior surfaces of a unitary molded plastic body consisting of providing soluble or meltable inert core member, applying ceramic or metallic reinforcing layers or films onto outer surfaces of the core member except its longitudinal ends, placing the core member covered with the reinforcings in the mold cavity, molding a plastic body around and integrally with the reinforcing layers or films on the core member, and fluidizing the core member to remove the same from the interior of said plastic body leaving the reinforcing layers or films on the interior surfaces of the plastic body.

Abstract: A tooth crown or the like fixed, custom fitted dental appliance made of a fired ceramic which undergoes substantially no shrinkage when fired, the appliance being made by forming a compact of the raw prefired ceramic with an undersurface shaped for a precise fit onto the prepared tooth on which the appliance is to be used, and thereafter firing the compact to a dense hard monolithic structure.

Abstract: A spruing assembly for receiving investment material in the production of an investment mold for castings by the "lost wax" process which includes a hollow chamber to receive the investment material formed by a base member and an engaging tapered ring. A horizontal feeder bar is contained within the chamber and is supported by hollow sprue means. The feeder bar is open at its top and has a narrow channel for conducting molten wax into the hollow sprue support. The base member includes a centralized sprue base former and support means associated with the former to provide support for the hollow sprue means supporting the feeder bar.

Abstract: A method and apparatus for casting of fragile complex shapes by the formation of a two layer wax mold about a pattern of the shape to be cast. Thereafter, the pattern is removed from the mold and the outer layer of wax dissolved. The slip is then poured into the mold and allowed to solidify before the inner layer of the mold is completely removed from the cast article.

Abstract: Method for producing a separating nozzle element including a separating body and terminal plates, for the separation of a gaseous or vaporous mixture, wherein the separating body comprises separating structures which penetrate the separating body and define separating chambers and gas conduits, and the terminal plates are provided with channels for the intake and discharge of gas streams. A mold layer is produced which contains negative outlines of the separating structures. Thereafter, the negative outlines of the mold layer are filled with a structure material which is compatible with the gaseous or vaporous mixture to be separated to form the separating structures. The mold layer containing the negative outlines of the separating structure is produced by shaping the mold layer from a reusable tool provided with the positive outlines of the separating structures.

Abstract: In order to remove a thin-walled wax model adhering to the walls of a first core piece and a second core piece, after solidifying, from a multi-part device for making thin-walled wax models, without damaging the wax model, after the external pressure is released, a mold-opening moment is generated simultaneously and abruptly in axially opposite directions by spring-loaded push-off bolts or directly by leaf springs in the upper parting faces and lower parting faces of the device. As a result, both the lower closing plate and the upper closing plate are separated from the annular casing and the wax model is separated from the core pieces, by a maximum of 3 mm, axially in opposite directions because the adhesion of the wax model to the walls of the core arrangements is overcome simultaneously and abruptly. Subsequently the two core arrangements and the casing are transported away from one another in an axial direction relative to one another, so that the wax model is freed.

Abstract: A shaped article having a synthetic resinous body and a thin fluoropolymer weld layer on its surface is formed by a process which comprises heating a heat conductive metallic core member, forming a thin fluoropolymer weld layer on the surface of the core member, treating the exposed surface of the fluoropolymer layer, forming a synthetic resinous body on the outer, treated surface of the fluoropolymer layer and removing the core member, such as by dissolving. In the shaped article thus produced, a thin fluoropolymer weld layer is formed on the surface of the synthetic resinous body, and the thickness of the fluoropolymer coating can be reduced. This permits the production of shaped articles at low cost and having high mechanical strength, even for complicated shapes. According to the invention, it is possible to produce articles having complex shapes such as corrosion resistant vessels, molds having good release characteristics, and so forth, at a comparatively low cost.

Abstract: Organ prostheses are manufactured starting from a support preformed in the shape of the prosthesis to be formed on which a sol giving on cooling a gel enabling a surface state approximating to that of a liquid-air interface is deposited, a hardenable flexible material compatible with body tissues is deposited thereon and the prosthesis removed from the mould. Ureter, bladder, vascular and cardiac prostheses made by this method are disclosed.

Abstract: The invention relates to a factory prefabrication method for hollow panels for the on-site erection of insulated constructions.This method employs a three-dimensional framework 1 composed of thrust bars arranged in two parallel planes and of link bars linking the former. The method consists in placing said framework in a mold 13 containing a pulverulent material 16 wherein the framework is embedded by part of its thickness, in molding an insulating synthetic material 4 in the empty part of the mold so as to embed the visible parts of the framework 1, in placing above the mold a form sheet 2 so that the insulating material shall make contact with it and adhere to it during hardening, and after this hardening, in extracting the pulverulent material and in ejecting the obtained panel. The panel so manufactured can be provided after ejection with a second form sheet opposite the first.

Abstract: A method of making hard surface prototypes or styling concept models by assembling a contoured polystyrene foam pattern and applying an epoxy clay-like material in two steps to replace the surface of the polystyrene foam pattern. The polystyrene foam pattern is first assembled from blocks cut out to design drawing specifications. The pattern is then shaped to the design contour. The surface of the pattern is then grooved and the grooves filled with the epoxy clay. The remainder of the pattern surface is then removed and replaced by more epoxy clay which is then sanded and finished with paint and suitable trim pieces.

Abstract: A panel with a Venetian mosaic or terrazzo surface is produced by providing a support surface with partitioning walls to separate areas of the desired design, placing colored chips in respective areas, and laying settable material (which may be of different colors in different areas) thereover. The set layer is removed, and the front face (formed on the support surface) is ground. The walls may be incorporated therein. They may be provided by means of sheet material in which the design is carved and which is adhered to the support surface.

Abstract: The invention relates to a device and method of using the device and plastic injection molding processes. A mold is provided utilizing a core inside the injection cavity of the mold. The core is prior to insertion of the mold subjected to a sub-freezing atmosphere. The core is then placed in the mold cavity wherein is injected the plastic material to mold the plastic part substantially surrounding the core. A thin film of air is formed around the "core" at the time of the injection of the plastic material thereby providing a substantial increase in surface finish to the plastic molded part. The core is made from a material which when heated will melt prior to the melting of the plastic part so that the core and part are removed from the cavity and subjected to a heating step thereby enabling removal of the core from the part.

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: This invention comprises a process for molding a three dimensional decorative article where cored out or raised portions extend to a depth of at least 0.6 centimeter, said process comprising generating electronically a line drawing of said article and electronically displaying the drawing; photographing said drawing to form a photographic transparency; positioning said transparency over a layer of a liquid photopolymer having a depth greater than 0.6 centimeter; exposing said photopolymer through said transparency to actinic light to set the photopolymer; and removing the liquid from the set photopolymer to form a three dimensional article having the appearance of said drawing.

Abstract: A destructible core is formed from a frangible plastic shell filled with inert ballast. The core is used for forming complex cavities in the production of cast resin parts.

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: A substantially entirely plastic rotary drum filter is made by applying a layer of plastic to the interior surface of a cylindrical mold, removing the mold, and applying at least one additional layer of plastic to the exposed exterior surface of the shell formed by the first layer. A plastic annular axial valve housing with plural valve chambers and a central valve receiving space is mounted to a head assembly at the head end of the shell. A tail assembly closes the opposite end of the shell to form the drum. Circumferentially spaced interior plastic bucket sections are positioned midway between the head and tail assemblies. Upon the periodic application of a vacuum to the valve chambers, filtrate is delivered from the exterior of the drum through an associated bucket and plastic drainage conduit to an associated valve chamber. Plastic reinforcing rings strengthen the drum along its length and in the region of the bucket section.

Abstract: A load-bearing building panel capable of forming an external wall cladding or roof component has a solar heat collecting capacity in the form of channels for heat exchange fluid incorporated in the fabric of the panel. The panel is made of a structural plastics material, such as G.R.P. laminate, successive layers being moulded to simulate tiles. On the back or underside, longitudinal reinforcing beams are built in during laying up of the panel. Between the beams cores or formers defining a matrix or channels are encapsulated in layers of the G.R.P. Wax cores are melted or dissolved out after curing of the panel; metal formers remain embedded in the fabric of the panel. The matrix is connected by flow and return pipes to a heat exchange system within the building. Panels intended for roofing have ridge flanges and wall plates moulded into the substrate at the appropriate pitch angle, and a split capping tube embraces the ridge flanges. A pitched roof formed by oppositely sloping panels is self-supporting.