Abstract: The invention is a process for manufacturing a material, a mass of finely divided particles of which an applied magnetic field can induce to change from a non-magnetized condition, in a sense of exhibiting no net external field, to a magnetized condition, in a sense of exhibiting an external field, which comprises:A. reacting starting materials comprising a salt of an alkali metal, e.g., lithium, sodium or potassium, a salt of a first metal in a divalent state, a salt of iron in a trivalent state, at least one of said salts being a halide, and an epoxy compound in the presence of a solvent selected from the group consisting of lower alkanols and water to obtain a mixture comprising a metal hydroxide-containing and solvent-containing gel;B. drying said gel to remove the majority of the solvent therefrom without significantly altering the distribution of lithium, sodium, or potassium therein to obtain porous particles; andC. heating the porous particles to produce the desired material.

Abstract: In the formation of an elastomeric tube or the like on a toroidal core, elastomeric material is applied to the core generally along one side of the core, and force-applying means are utilized to press annular portions of the so-deposited elastomeric material onto the core. Cutting means are also included for cutting away elastomeric material not deposited on the core. The core and elastomeric material deposited thereon are then turned over and the operation is repeated, whereby elastomeric tube means or the like are provided on the toroidal core.

Abstract: A method of making disc records, particularly video discs from thermoplastic sheet material. In a press a thin flexible matrix is disposed between the sheet, which is backed by a resilient cushion, and a flexible diaphragm which constitutes a wall of a hydraulic pressure chamber.

Abstract: Chemical tablets for insertion into settling tanks and the like to dissolve solid waste material are formed in a tablet making press having a female die section which is charged with chemical in powder form. One end of an elongated strip of water soluble paper, having a heat and pressure activated adhesive coating on one surface extends between the female die and the male die carried by the press ram and is advanced in timed relation to the motion of the press. The male die section has a sharpened edge and is heated. As it moves into contact with the female die section it cuts out a separator from the sheet strip and adheres it to the tablet as it is formed. A plurality of such tablets are stacked in a cylindrical container with the separators disposed between adjacent tablets to prevent the tablets from sticking together. In use, the tablet with the separator is thrown into the settling tank and the paper separator is dissolved along with the other solid waste material.

Abstract: A method for fabrication of a relatively low cost display or communicative novelty button in which a consumable restrictor sheet is placed over a vacuum draw type female mold cavity. The restrictor sheet may be of cardboard and be apertured with a diameter smaller than the mold cavity diameter. A thermoplastic sheet material is then placed over the restrictor sheet, heated to reach a formable state and vacuum drawn through the restricted aperture and down so that the sheet comes into contact with and generally conforms to the desired shape defined by the mold cavity. The plastic sheet material may then be trimmed near the edge of the restrictor sheet to leave a button shell mounted on a restrictor sheet which may then be used for purposes of display. The restrictor sheet also enables fabrication with an inwardly facing peripheral groove that may be used to secure a pin fastener. An alternate form of fastener in which a portion of the remaining plastic sheet is used is also disclosed.

Abstract: A plastic container for food products and method of making the container, the body of the container thermoformed from a sheet comprising a plurality of layers which are held together in a contiguous structure without being securely bonded together, said layers of the container body functionally secured in place after filling by an interlocking closure. At least one layer provides structural rigidity and a good water vapor barrier and at least one other layer provides a barrier to the transmission of oxygen and a supplementary water vapor barrier. The container is capable of withstanding retort temperatures. Separation of the scrap sheet from which the container body is formed and recycle of separate layer scrap from the container body thermoforming process can be accomplished since the layers forming the container body are not securely bonded together.