Abstract: A construction for a battery of coke ovens and to a method for repairing m in which a continuous vertical joint plane is provided in the walls of the piers separating the ovens of the batteries, which walls are constructed of courses and headers and stretchers, the plane extending along one of the lateral faces of the headers, with one of the two adjacent stretchers of the course immediately above and below the header being longer than the other stretchers in the wall and the other being shorter so that the joint between them is located in the same vertical plane as the said faces of the headers.

Abstract: A device and method for spin casting articles, such as lenses, employing a rotatable polymerization column in conjunction with a plurality of molds such that the column is adapted to accommodate a plurality of gravity fed molds in a loose mating engagement that insures rotation of the molds to be synchronized to the speed of rotation of the column to produce quality spun cast articles.

Abstract: An improved retort apparatus for recovering oil from crushed oil shale moved by gravity through a passageway of an elongated housing includes a control assembly connected adjacent the outlet end of the housing to control the rate of movement of the crushed oil shale through the passageway. A plurality of heat exchangers are located in the housing for transferring heat in sequence to or from the crushed oil shale. The heat exchangers are spaced to define a drying zone, a preheating zone, a hydrocarbon recovery zone, and a waste heat recovery zone. A pump recirculating circuit is provided for passing waste heat recovered from the waste heat recovery zone to the preheating zone. An auxiliary heating assembly connected to the heat exchangers in the hydrocarbon recovery zone delivers sufficient heat to raise the temperature of the crushed oil shale moving through the hydrocarbon recovery zone to the critical temperature for separating hydrocarbons in vapor form therefrom.

Abstract: The invention concerns a method for manufacturing a contact lens, through molding within water-tight molds. The polymerization of lenses is insured by arranging a number of molds within one or several sealed metallic chambers (9) constituting a resonant cavity of a unique mode for an ultra high frequency wave; these molds are positioned in an area of the cavity where the electromagnetic field approximately of ultra high frequency waves is homogeneous, and are distributed so that the amounts of basic composition to be polymerized act as a load fitted to the inside of said cavity.

Abstract: A melt spinning apparatus is disclosed which is adapted for forming a plurality of synthetic filaments from a molten polymer. The apparatus comprises a spin block composed of a spin plate having a plurality of transverse ducts, a cover plate overlying the spin plate, and a cavity formed between the two plates and communicating with the ducts for receiving the molten polymer. A pair of side plates are disposed along respective opposite sides of the block, and the block and side plates include mating inclined contact surfaces whereby tightening of the side plates against the block causes the spin plate and cover plate to be pressed toward each other, whereby a seal is formed between the plates which prevents leakage of the molten plastic from the cavity.

Abstract: A method and apparatus for manufacturing plates of thermoplastic synthetic material or the like by compression molding is disclosed, wherein a mold comprising a respective, horizontally, disposed upper and lower part is first filled with synthetic base material in granular form or the like, is subsequently heated while being pressure-charged and closed for the purpose of melting the synthetic base material.

Abstract: A method and apparatus for forming a round end on a small plastic filament which includes a die having a channel extending into one side with a hemispherical interior end and a bore extending into the other side and coaxially aligned with the channel and having a conic interior end. The tip of the conic section communicates with the hemispherical section. A relief recess is spaced from the periphery of the hemispherical section by a land portion. The peripheral edge of the land portion, which also forms the edge of the channel, may be formed into a knife edge. In the die the filament is cold-formed to provide a hemispherical section spaced apart from the distal end of the filament. Material displaced during the cold-forming process is deposited in a relief section extending peripherally about the channel.

Abstract: A mesophase pitch derived fiber having a predetermined cross-sectional structure is produced by passing mesophase pitch being spun into a pitch fiber through a porous body positioned in the spinnerette channel of a spinnerette.

Abstract: An apparatus for, in one advantageous embodiment, concurrently forming a plurality of generally longitudinally extending grooves in a filter rod, and in another advantageous embodiment, for making small apertures in the grooves as the grooves are being formed in the filter rod. The apparatus includes a reciprocating die having an upper die block and a lower die block. Each die block includes protruding, elongated projections which are adapted to be imbedded into the filter rod upon closing of the die to impress grooves in the filter rod located in the die. In the embodiment wherein apertures are to be formed in the grooves, aperture forming punches are associated with each of the groove forming projections for punching apertures in the grooves as they are being formed.

Abstract: An aid for molding a filling material used in the cranioplasty to fill in a defective part of the skull. The aid allows a quick, efficient molding. It includes a bar made of an elastic material and being of a substantially L-shape section and a core member embedded therein to maintain the aid in a desired position.

Abstract: A process for machine direction orientation of nylon films in which nip rolls are applied to both the slow and fast orientation rolls with a substantially uniform force in the range of 15 to 45 N/cm width of nip roll. The temperature of the slow roll is held between 70.degree. and 180.degree. C. and the temperature of the fast roll is held between the temperature of the first roll and 20.degree. C. below the melting temperature of the nylon film. The distance between the orientation rolls is in the range of 10 to 2050 .mu.m.

Abstract: Fragile agglomerates with crushed rock fragments, such as fines which are subsequently agglomerated and which result in the crushing of rock fragments, such as oil shale prepared for retorting are mixed and delivered onto conveying means, such as a travelling grate by charging the rock fragments into a bin which delivers through a choke-feed onto the conveyor or travelling grate by introducing the agglomerates through a series of space conduits or tubes terminating inside the bin below the level of the lump material or fragments in the bin where the rock fragments have a downward travel such as to enable the aggregates to diffuse from the ends of the spaced pipes into and through the fragments and while so separated and diffused through the fragments move with the fragments onto the grate.

Abstract: The present invention relates to a process for producing an of aromatic polyimide film comprising (A) casting on a support a dope containing an amide-type polar solvent and 10-45 weight percent of a polyamic acid having more than 0.4 dl/g an inherent viscosity of more than 0.4 dl/g, (B) concentrating the polymer content to be at least higher than that of the initial dope while simultaneously raising the ring closure ratio above 30%, (C) removing the solvent from the film by extraction in an aqueous medium so as to lower the solvent content of the film below 10% and (D) then heating the film to a temperature of more than 200.degree. C.The process of the present invention is useful for the production of aromatic polyimide film having a reduced rate of solvent decomposition and improved productivity.

Abstract: Apparatus for the manufacture of a video disc caddy sleeve comprising folding platens, an intermediate spacer plate with indentations on the leading edge, and a selective heating means. Spacer plate causes plastic sheet to bend in the middle while folding platens close to a folded up position. Indentations on the leading edge act to keep label, already adhered to plastic sheet, from tearing while sheet is being bent into a U-shaped enclosure.

Abstract: An improved gas feed means adapted to accommodate and secure the lower end of a polymerization column for synchronous rotation therewith and adapted to supply a controlled amount of a gaseous medium, such as nitrogen, into and through the rotating polymerization column so as to purge any undesirable gas within the polymerization column that could adversely affect the quality of the objects being centrifugally casted.

Abstract: An apparatus for fabricating a disc record package from a flat plastic sheet, comprising a narrow intermediate section interposed between a pair of panel portions. The apparatus includes a housing, a pair of substantially rigid planar folding plates pivotally mounted for movement, a rigid spacer plate, a means for selectively heating the narrow intermediate section of the said flat plastic sheet, and a means for folding the said rigid planar folding plates. The folding plates are operable between a spreadout co-planar position and a folded up juxtaposed position. The rigid spacer plate acts to form the central portion of the folded plastic sheet during the molding operation. The means for moving the said spacer plate and folding plates are pneumatically operated cylinders.

Abstract: A safety shield for containing and deflecting a fluid leaking from a flanged pipe coupling in the form of an arcuate strip of transparent fluoropolymer. The strip has a flange along each circumferential edge which is integral with the strip and extends radially inwardly thereof. The strip is of sufficient length to encase the circumference of the pipe coupling flange to which it is applied with the opposing ends overlapping and fastened together. The flanges closely engage the radial surfaces of the coupling flanges. The safety shield is obtained by heat-shrinking a heat-shrinkable tube of fluoropolymer while restricting radial shrinkage thereof except the marginal edge portions which become the flanges.