Abstract: Disclosed is a method of manufacturing a semiconductor device in which an upper conductor layer and a lower conductor layer are electrically connected to each other through a contact hole provided in a multi-layer film. A lower conductor layer having a connection portion is formed on a semiconductor substrate. A first insulator film is formed on the semiconductor substrate to cover the lower conductor layer. On the first insulator film is formed a second insulator film having etching speed different from that of the first insulator film. An opening portion for exposing the connection portion is formed in the first and second insulator films. A native oxide film existing on the surface of the exposed opening portion is removed. An upper conductor layer is deposited on the second insulator film to fill the opening portion.

Abstract: Disclosed is a method of manufacturing a semiconductor device of a multi-layer film structure. A gate electrode having a connection portion is formed on a semiconductor substrate. An underlying silicon oxide film is formed on the semiconductor substrate including the gate electrode. A silicon nitride film is formed on the silicon oxide film. A first opening portion having a larger diameter than that of the connection portion is formed at a portion of the silicon nitride film above the connection portion. An overlying silicon oxide film is formed on the silicon nitride film so as to fill the first opening portion. A second opening portion for exposing the connection portion is formed in the underlying silicon oxide film and in the overlying silicon oxide film. A native oxide film existing on the surface of the exposed connection portion is removed with an aqueous solution of HF. Finally, an aluminum alloy film is deposited to fill the second opening portion and cover the overlying silicon oxide film.

Abstract: There are disclosed a nitrile-terminated Schiff compound represented by the formula X--Z--Y--C.tbd.N).sub.m (I) wherein n is 1 or 2, Z is --CH.dbd.N-- or --N.dbd.CH-- and Y is a divalent organic group such as phenylene and the like, and X is the same as Y when n=2 or H, lower alkyl group etc. when n=1; polymers obtained by polymerizing said Schiff compound alone or together with other monomers, and a process for preparing such a polymer therefrom.

Abstract: A steering wheel is described, which comprises a core that is covered with a synthetic resin covering material, wherein said covering material is coated with a urethane-based paint that contains 2 to 10 wt % of nylon beads having an average particle size of 10 to 30 .mu.m.

Abstract: A thermosetting resin composition comprising (a) a polyfunctional maleimide, (b) at least one member selected from the group consisting of alkenylphenols and alkenylphenol ethers, and (c) an allyl ester of polyvalent carboxylic acid, or cyanuric or isocyanuric acid and a prepolymer obtained by preliminarily heating the thermosetting resin composition can be used as a solventless type varnish for impregnating, e.g. electric windings, or for preparing a prepreg, and can give a cured product with heating at 120.degree.-250.degree. C. having excellent heat resistance of class C (180.degree. C. or higher) and electrical insulating properties.

Abstract: There is disclosed a catalytic composition represented by the formula:(Mo).sub.a (W).sub.b (Bi).sub.c (Pb).sub.d (Sb).sub.e (A).sub.f (B).sub.g (C).sub.h (P).sub.m (O).sub.nin which A is iron and/or chromium, B is cerium and/or magnesium and C is potassium and/or lithium; and a, b, c, d, e, f, g, h, m and n stand for the numbers of atoms for molybdenum, tungsten, bismuth, lead, antimony, A, B, C, phosphorus and oxygen elements respectively, wherein, given that a+b=12,0.ltoreq.b.ltoreq.7, 0.4.ltoreq.c.ltoreq.7, 2.ltoreq.d.ltoreq.12,0.1/22.ltoreq.e/a.ltoreq.25/22, 0.05/22.ltoreq.f/a.ltoreq.3/22,0.ltoreq.g/a.ltoreq.2/22, 0.ltoreq.h/a.ltoreq.3/22,0.ltoreq.m/a.ltoreq.7/22, andn is the numbers of oxygen necessary to satisfy the valences of atoms for the individual constituent elements other than oxygen.

Abstract: There is disclosed a catalytic composition represented by the formula:(Mo).sub.a (W).sub.b (Bi).sub.c (Pb).sub.d (Sb).sub.e (K).sub.f (P).sub.g (O).sub.hin which a, b, c, d, e, f, g and h stand for the numbers of atoms for molybdenum, tungsten, bismuth, lead, antimony, potassium, phosphorus and oxygen elements respectively, wherein, given that a+b=12,0.ltoreq.b.ltoreq.70.4.ltoreq.c.ltoreq.72.ltoreq.d.ltoreq.120.005.ltoreq.e/a.ltoreq.1.140.ltoreq.f/a.ltoreq.0.1360.ltoreq.g/a.ltoreq.0.54, andh is one-half the sum of the products of the valences and the numbers of atoms for the individual constituent elements other than oxygen.

Abstract: Electric machine windings produced by wrapping a composite insulating material around an electrical conductor, said composite insulating material having been prepared by bonding two or more insulating materials with a silicone resin containing hydroxyl groups in the molecular structure, impregnating said composite insulating material with an insulating varnish comprising 1 equivalent of a polyfunctional epoxy compound and 2.5 to 25 equivalents of a polyfunctional isocyanate compound and curing said varnish, have excellent insulation properties under high temperatures and high humidity and thermal resistance of class H or more.