Abstract: A new method of making an electrically conductive hearth in a d.c. furnace is effected by first heating bricks such as magnesite-graphite bricks and the like, from their new commercially available form to high temperatures decresing the normal resistivity of the bricks and thereafter laying the bricks to form the hearth from top to bottom with the heat treated bricks.

Abstract: A process for treating a strip of film material carrying images in a plane to substantially remove a bend therein includes the steps of forceably positioning a portion of the film material having a bend into a common plane with the film image plane, subjecting the film portion to heat to remove the bend and thereafter allowing the heated film portion to cool.

Abstract: A method for heating a plurality of molds for casting heat fusable thermoplastic material each of the molds having casting surfaces and each of the molds having outer mold profiles which differ and wherein the molds are moveable into a mold chamber including the steps of providing a hot air distributor with different tube length profiles thereon; advancing a selected mold into the heating chamber and indexing the distributor to selectively match the outer profile of a selected mold with a selected tube length profile and directing hot air through the selected tube length profile for uniformly raising the temperature of the selected mold and casting heat fusable thermoplastic material in the heated mold to cause the heat fusable thermoplastic to adhere to the casting surface.

Abstract: A method of fabricating "adjustment-free" artificial dentures and a jig therefor. A precise jaw model is formed by pouring soft plaster into the concave surface of a precise provisional denture formed by any conventional dental procedure. A plaster block is formed having a recess conforming to the actual shape of the provisional denture. The recess is filled with a synthetic resin compound and then the precise jaw model is moved into the recess to form a plenum defined by the concave surface in the recess and the convex surface of the precise jaw model. During polymerization, any excess synthetic resin compound spilling over from the plenum can escape into a relatively wide clearance between the precise jaw model and the plaster block thus enabling the plenum to retain its original shape.

Abstract: A process for producing cold-bonded or non-fired iron ore which introduced as a charge into a blast furnace. The iron ore, which contains 10 to 70% of particles having a diameter ranging from 1 to 10 mm, is molded into a block, preferably by a pressure-molding method, a shock-molding method or a packing-molding method with vibrations. The block is then cured or hardened. This hardened block is crushed to have a predetermined shape. An additive such as CaO, Al.sub.2 O.sub.3, or MgO may be added to the iron ore to adjust the basicity as a whole to 0.8 to 2.0. Moreover, the molding step is conducted so that the product may have a void volume equal to or less than 25%.

Abstract: A method for producing centrifugally cast concrete product including charging pumpable concrete into a cylindrical form and rotating the form to cast the concrete by a centrifugal force, in which the concrete contains a high water reducing agent, an air entraining agent and an inorganic fine powder, and 5.5 to 18.5% of air content, thereby considerably reducing the amount of discharged sludge and, in turn, the labor and expenses required for the disposal of sludge, while maintaining the strength of the product as same as or greater than that for conventional products, without the need for complex processes.

Abstract: A flexible mold and method of forming a base defining either a full base or quadrant base of a dental model is provided with a perimeter member for defining the side walls of the base and a shelf extending inwardly from the rear side wall for delineating a slot at the rear of the base, which slot is usable for adhering an arm of an articulator. The configuration of the slot and/or the rear side wall of the base is striated for better adherence with the attached articulator.

Abstract: A method of making an embossed gypsum panel including an embossing device mounted on a moveable support and positioning the device so that it is located at the point of "set" of the gypsum slurry from which the board is made.

Abstract: A method for installing a gasket having a first exposed pipe-engaging portion and a second portion which is anchored within a peripheral wall of an opening in a poured-in-place concrete wall. The method includes the first step of erecting a form including an inner wall and an outer wall to define the poured-in-place concrete wall, the outer wall of the form having an opening in the region where the opening in the poured-in-place concrete wall is to be. The second step includes providing an assembly of an inner mold disc having a central particularly defined shape, the gasket, having a particularly defined shape and disposed in a particularly defined orientation, and an outer mold disc having a particularly defined shape. The third step includes suspending the assembly at a desired predetermined location between the inner and outer walls by a depending fixing bar, having a particularly defined shape; the suspending being by a particularly defined bolt structure.

Abstract: A process for forming a hollow cast structure of cementitious material using a hollow mold having a predetermined surface geometry corresponding to the surface geometry of the structure to be cast. The cementitious material is an admixture of hydraulic cement, water and particles of aggregate containing presized, inorganic filler particles having a maximum size of about 50 microns in a predetermined proportion to the hydraulic cements such that the admixture is substantially nondilatent and thixotropic. The admixture is fed into the hollow mold against the predetermined surface geometry from a feeding device separated a predetermined distance from the mold surface while simultaneously rotating the mold relative to the admixture.

Abstract: A process for forming a joint for connecting a plurality of bars in a metal casing includes the steps of pouring a granulated solid into the metal casing and prestressing the solid by driving in a mandrel through the filling aperture of the casing. Thereafter, an unsinkable or a low-shrinkage hardening fluid is injected into the metal casing and permitted to harden.

Abstract: A method of forming a falsework for formed concrete structures by providing tubular elements at longitudinal edges of metal planks and corner units, and providing slots in these tubular elements such that hooks engaged in these slots can brace metal plates against two adjoining such elements while the metal plates are supported by bars welded to the elements below the slots. After forming the falsework, concrete is poured and allowed to set to form a concrete structure of walls and a roof in a single concrete-pouring operation.

Abstract: A process for casting slip into a ceramic product using at least one unique casting mold. The casting mold is formed of a plurality of separate porous mold parts, each of which has a fluid-tight outer face, an inner molding surface and a plurality of channels therein. The mold parts are combined so that the inner molding surfaces define a molding cavity in the mold. The casting mold is positioned within a pressure container such that a space is established surrounding the casting mold within the pressure container. This space is in fluid communication with the molding cavity of the mold.

Abstract: A storage vault includes an inner tank entombed within a concrete outer tank by first erecting a pair of sidewall forms on a base plate to create an open-top enclosure. The wall forms are securely clamped together. A layer of concrete is then poured onto the base plate and the inner tank is lowered onto the layer of concrete. Concrete is poured into the enclosure to entomb the inner tank while the bottom layer of concrete is still wet. The inner tank is restrained by a pair of reinforced hold-down bars extending over the top of the enclosure and having a pair of downwardly extending hold-down tubes which contact the top of the inner tank. A back hold-down bar is forced downwardly by a chain which passes over the hold-down bar and is fastened to the base plate. After the concrete has set sufficiently, the hold-down bars and tubes are removed and the holes created by the hold-down tubes are filled with concrete.

Abstract: A process for the reproduction of works of art made of a lithoid material including the use of a silicone rubber to obtain a negative mold of the work of art, wherein a thin layer of a fluorinated grease, based on polytetrafluoroethylene and a liquid perfluoropolyether, is first applied to the work of art.

Abstract: Inorganic raw materials are heated and pressed in a kiln to produce a porous ceramic panel. The foaming body is first-pressed in a foaming step, and after the foaming step the first-pressed foamed body is second-pressed, in order to obtain superior dimensional accuracy and surface smoothness. The panels are applicable, for instance, to interior or exterior materials of various kinds of buildings such as prefabricated houses and shops.

Abstract: A process for insulating a rotational casting mold for use in a casting process for making a substantially even thickness fascia. The fascia is prepared by placement of a plastic powdered material into an enclosed mold, heating and agitating the mold for distributing the plastic powder on the mold surfaces to provide a substantially even thickness fascia part on the molding surface. The mold includes first mold surfaces for defining critical portions of the mold which correspond to the desired portions of the mold for forming the finished shape of the part by melting of the plastic powder to a uniform film along the surface. The mold also includes second mold surfaces defining non-critical portions of the mold where it is undesirable for plastic filming to occur.

Abstract: A tunnel having an inner surface and extending along an axis is lined with pumpable concrete having a predetermined hardening time and by a form having an annular inner wall and an axially movable front wall. Substantially equal sized batches of pumpable concrete are successively injected into the space through the movable front wall through a plurality of angularly equispaced ports therein. The batches are injected axially backwardly through the ports at such a rate that succeeding batches are injected through each port at a time interval that is substantially smaller than the concrete hardening time. The front wall is displaced forward at such a rate and the batches are sized such that each batch spreads over a predetermined axial and a predetermined angular distance, such that the latter is greater than the former.

Abstract: A method for making an article, such as a plastic food container lid having frangible score lines. The article is formed of a sheet of plastic material having substantially constant thickness with score lines defining an offset portion thereof which is connected to the remaining sheet material by a segment that is thinner than the sheet material and being rupturable for the removal of the offset portion. The periphery of the inwardly directed portion of the offset portion overlaps the periphery of the outwardly directed portion of the offset portion on the opposite side of the sheet material. The fracturable score lines are corrugated along their length by a plurality of successive grooves and ridges with the grooves extending deeper into the material than the ridges.

Abstract: A process for preparing a thin film having a large area. A casting solution of a film-forming material and a solvent is fed to the surface of a liquid substrate immiscible with the solution by utilizing interfacial tension. Spontaneous spreading of the casting solution occurs across the surface of the liquid substrate and evaporation of the solvent produces a thin film on the liquid surface which is continuously collected. The feed of the casting solution to the surface of the substrate is at least either a material which shows selective wettability for the casting solution in preference to the liquid substrate or a structure capable of developing capillarity.