Abstract: A fluorescent display apparatus includes display cells of a first type consisting of several sets of fluorescent display segments of various colors arranged in a certain order and display cells of a second type consisting of display segments equal in number and color, but opposite in the order of arrangement of colors, to the first display cells. The first and second display cells are arrayed in a matrix fashion with their lead lines aligning alternately with the intention of reducing areas used for the bend of lead lines and thereby arranging the cells closely so as to enhance the resolution of display.

Abstract: A luminescent display tube wherein a plurality of luminescent trios and a plurality of electrode units corresponding thereto are disposed opposite to each other in a single housing, and a member forming an enclosure of each electrode unit functions also as an accelerating electrode. The invention realizes a high-luminance display tube or display cell of a small-sized structure which incorporates a plurality of luminescent trios serving as picture elements and electrode units corresponding thereto. Consequently, it becomes possible to construct a large-picture display apparatus of moderate dimensions by arraying a multiplicity of such display cells. Furthermore, a plurality of wire cathodes and first grids as well as a common second grid are grouped into an electrode unit with its enclosure functioning as the second grid, and such electrode units are arrayed correspondingly to individual luminescent trios, thereby facilitating assembly and manufacture of a desired display cell.

Abstract: A luminescent display cell comprising a glass envelope having a front panel, a side wall, and a rear plate. Plural luminescent display segments are formed on the front panel of the glass envelope, the display segments being supplied with an anode voltage. Plural cathodes are arranged on the rear panel side of the glass envelope in corresponding relation to the display segments. Plural control grid electrodes are arranged between the display segments and the cathodes in corresponding relation to the display segments. A common accelerating electrode is disposed between the display segments and the control grid electrodes. The voltage applied to each control grid electrode is controllable for electron emission from the cathodes so as to render each display segment corresponding to each control grid electrode selectively luminous for display.

Abstract: A foaming resin composition comprising an unsaturated random copolymer consisting of propylene, ethylene, and a branched 1,4-diene represented by the following formula: ##STR1## wherein R.sup.1 represents an alkyl group having not more than 8 carbon atoms; and R.sup.2 and R.sup.3 each represents a hydrogen atom or an alkyl group having not more than 8 carbon atoms, provided that R.sup.2 and R.sup.3 do not simultaneously represent a hydrogen atom, and a chemical foaming agent. The composition is prevented from increasing in temperature due to shearing during molding into a foamable sheet and, therefore, provides a uniform foamed product.

Abstract: There are disclosed a cross-linked polyethylene insulated power cable with improved electric breakdown strength having a conductor covered with a cross-linked polyethylene insulating layer having a density of 0.918 g/cm.sup.3 or more, a crystal thickness of 76 .ANG. or more, and a gel fraction of 60% or more; and a method for manufacturing such a power cable.

Abstract: A copolymer of ethylene and a minor proportion of an .alpha.-olefin having 4 to 10 carbon atoms is characterized by having the properties(1) a melt flow rate (MFR) of 0.1 to 100 g/10 min.;(2) a density of 0.91 to 0.94 g/cm.sup.3 ; and(3) a xylene absorption per unit amorphous region (Y) satisfying the formula:Y<-0.80X+0.67wherein X is the degree of the crystallinity of the copolymer. By satisfying the above requirements, the copolymer can give a film packaging material having excellent transparency, impact strength and opening property (anti-blocking property) in combination.

Abstract: A flat thermionic cathode is provided with a substrate having at least one main heating element thereon to produce at least one substantially localized area of heat and a sub-heating element to substantially define a heating area, the localized area being produced within the heating area. A cathode element including electron emissive material is disposed at the localized area. While the localized area tends to produce a temperature gradient directed from the localized area toward the perimeter of the substrate so as to create thermal stress in the substrate along the perimeter thereof, the sub-heating element reduces this temperature gradient and, consequently, the thermal stress.