Abstract: Method and apparatus for manufacturing a heater roller which includes a cylindrical electrically insulating substrate having an outer circumferential surface, and an electrically resistive heat generating layer formed on the substrate for heating a desired member in evenly pressing contact with that member, wherein an electrically resistive paste for forming the electrically resistive layer is delivered from a paste delivery tube of a paste delivery device onto the outer circumferential surface of the substrate, while the cylindrical substrate is rotated about its axis and while the paste delivery device and the electrically insulating substrate are fed relative to each other in the axial direction of the cylindrical substrate, such that the relative feeding speed is controlled in relation to the relative position of the paste delivery device and the substrate in the axial direction of the substrate, within a range that permits formation of a film of the electrically resistive paste on the substrate, which fi

Abstract: A monolithic ceramic filter having a portion of the partition wall of a honeycomb structure exposed with its end face on an outer wall surface of the structure and increased in thickness as compared to the remaining portion of the partition wall to form a flow resistance relaxing portion is disclosed. The monolithic ceramic filter may also have a groove-shaped recess which is separated via a partition from a liquid supply passage of a honeycomb structure and is in communication with the outside of the structure. The flow resistance of the filtrate within the partition walls may be diminished to enable efficient filtration. The filter is produced simply by extrusion molding. There is no necessity of forming holes for discharging the filtrate in some cases.

Abstract: A discharge display device wherein a gas-tight space defined by two plates and a sealing member is divided into a plurality of discharge chambers by partition walls formed on one of the two plates, and height adjusting layers are interposed between end faces of the respective partition walls and an inner surface of the other plate. Each height adjusting layer is formed from a material which has a softening point not lower than that of the sealing member and which is softened at a sealing temperature at which the two plates are bonded together by the sealing member. The height adjusting layers, which assure gas-tight separation of the discharge chambers, may replace upper end portions of the partition walls. Alternatively, the partition walls may be entirely formed from the above-indicated material.

Abstract: An adsorbent body having a porous structure for purifying a fluid, wherein the porous structure comprises activated carbon, and an inorganic binder for bonding together grains of the activated carbon. The porous structure optionally comprises activated alumina. The adsorbent body is produced by: preparing a raw material composition including a source material which gives activated carbon, aluminum hydroxide which gives activated alumina (Al.sub.2 O.sub.3), and an inorganic binder for bonding together grains of the activated carbon and the activated alumina; forming an unfired shaped body of the raw material composition; and firing the unfired shaped body at a predetermined sintering temperature to produce the adsorbent body.

Abstract: A fluorescent display tube including a substrate, a plurality of anodes formed on the substrate, fluorescent layers formed on the respective anodes, cathodes located above the fluorescent layers to generate electrons which strike the fluorescent layers, ribs formed of an electrically insulating material on the substrate so as to surround at least a portion of a periphery of each of the anodes and having a larger height from the substrate than the fluorescent layers, and grid electrodes formed on the respective ribs to control activation of the fluorescent layers. Each rib consists of a plurality of layers laminated by screen printing using a paste which includes the electrically insulating material.

Abstract: A fluorescent display tube including a substrate, a plurality of anodes formed on the substrate, fluorescent layers formed on the respective anodes, cathodes located above the fluorescent layers to generate electrons which strike the fluorescent layers, ribs formed of an electrically insulating material on the substrate so as to surround at least a portion of a periphery of each of the anodes and having a larger height from the substrate than the fluorescent layers, and grid electrodes formed on the respective ribs to control activation of the fluorescent layers. Each rib consists of a plurality of layers laminated by screen printing using a paste which includes the electrically insulating material.

Abstract: A composite substrate 30 is constituted by an alumina substrate 16, a metallic layer 34, and a copper sheet 26 bonded to the alumina substrate 16 via the metallic layer 34. The metallic layer 34 is constituted by a tungsten sub-layer 34a having a low coefficient of thermal expansion, a tungsten/silver-copper alloy mixture sub-layer 34b, and a silver-copper alloy sub-layer 34c having a high coefficient of thermal expansion. In the mixture sub-layer 34b, the ratio of the percentage content of the silver-copper alloy to that of the tungsten increases with distances from the alumina substrate 16.

Abstract: Disclosed is a plasma display panel including a porous metal plate in which a plurality of holes for display cells are formed at positions corresponding to intersections at which a first linear electrode group and a second linear electrode group cross each other with a predetermined interval therebetween, and a front glass plate, wherein openings of the holes of the porous metal plate on the front surface side are larger than openings on the rear surface side, the openings on the rear surface are covered with a molten material of an inorganic dielectric containing glass and are thereby air-tightly sealed. This plasma display panel is light in weight and thin and can be easily assembled.

Abstract: Dental investment materials for providing inexpensive dental investments which are free from the occurrence of cracks, crevices or breakage and can greatly reduce the metal casting time, dental casting molds using the same and a process for burning them. The dental investment material contains as the major components a calcined gypsum powder, a cristobalite powder and a quartz powder and additionally contains a gas permeability improving additive. In the dental investment prepared using such dental investment material, the thermal expansion can be dispersed and the steam pressure generated can be released effectively during calcination and burning.

Abstract: Coated abrasive grains and a manufacturing method for them are disclosed. The abrasive grains are coated using an immersion method with a coating comprising at least one substance selected from carbides, borides, and nitrides of a metal, comprising: preparing an immersion bath comprising a molten salt bath containing said metal; and immersing abrasive grains to be treated in said immersion bath for a suitable length of time.

Abstract: A grinding wheel for grinding a workpiece, including a core portion connected to a drive shaft, and an abrasive portion fixed to an outer circumferential surface of the core portion for grinding the workpiece. The grinding wheel further includes at least one balancing member which is movable in a circumferential direction of the wheel, a driver device for moving the balancing member(s) in the circumferential direction so as to change an angular position of each balancing member, a signal receiving device for receiving a control signal for balancing the wheel, and a driver control circuit for operating the driver device for moving the balancing member(s) so as to balance the wheel, according to the control signal received by the signal receiving device. The above-indicated at least one balancing member, driver device, signal receiving device and driver control circuit are all disposed within the core portion of the wheel.

Abstract: Coated abrasive grains and a manufacturing method for them are disclosed. The abrasive grains are coated using an immersion method with a coating comprising at least one substance selected from carbides, borides, and nitrides of a metal, comprising:preparing an immersion bath comprising a molten salt bath containing said metal; andimmersing abrasive grains to be treated in said immersion bath for a suitable length of time.

Abstract: Gypsum models and molds made of a dihydrate gypsum (CaSO.sub.4 .multidot.2H.sub.2 O) having uniformly dispersed therein carbon fibers having a predetermined length in a defined range of amount are described. The molds include various types of molds such as original molds, basic molds, forming molds and the like. A method for manufacturing these molds is also described in which sizing agents deposited on carbon fibers are decomposed and removed by heating or dissolution in solvent, separating the carbon fibers into single fibers in water, adding a major part of hemihydrate gypsum (CaSO.sub.4 .multidot.1/2H.sub.2 O) powder to the carbon fiber dispersed water to obtain a gypsum slurry dispersing uniformly those single fibers, and casting the slurry in a case mold to obtain forming molds. Production efficiency for manufacturing white wares by the gypsum forming molds on which a pottery or porcelain plastic clay is jiggered removing the resulting green product from the mold is also described hemihydrate gypsum.

Abstract: Grinding stones, especially resinous and metallic grinding stones which have a controlled distribution of abrasive grains are made by a novel method, in which electrically conductive layers of such pattern which controls sites to be bonded with the grains are formed on the selected surface of a binder sheet, the sheet is immersed in an electrolytic bath containing metallic ions and the grains, the grains are fixedly mounted on the aforementioned sites by metals deposited on the surface of binder sheet with electric paths between the conductive layers and an opposite electrode in the bath, and a plurality of said sheets are placed in layers and warm or hot pressure-molded. When the binder sheet is made from electrically conductive materials, the pattern of the conductive layers is made by masking.