Abstract: An electrophotographic developing method for developing an electrostatic image formed on an electrostatic image supporting member by using a mono-component insulative developer is disclosed. Electrical potential of said developer for developing the electrostatic image is produced by frictional charging effect of said developer.

Abstract: A solid tantalum electrolytic capacitor is formed by a method comprisinganodizing a tantalum sintered body for substantial dielectric film growth in a substantially aqueous electrolyte;anodically treating said anodized tantalum body in at least one fused salt selected from the group of nitrates of alkali metals, nitrates of alkaline earth metals and nitrites of alkali metals with an applied voltage which is as high as possible but within a range wherein capacitance-decrease of the anode formed in the aqueous electrolyte is not caused; andanodically treating said fused salt-treated tantalum body in a substantially aqueous electrolyte with an applied voltage which is as high as possible but within a range wherein re-anodization will not occur, the temperature of said fused salt being in the range of 250.degree. C. to 350.degree. C.

Abstract: A chip type tantalum capacitor has an insulating resin frame, a pair of substantially flat metal foil terminals bonded to both sides of the frame, at least one of the frame sides having a slit therethrough and open to the outside of the metal foil terminal on the one frame side, the metal foil terminal on the one frame side being a metal selected from the group consisting of copper and nickel. A tantalum capacitor element having a pair of terminals is enclosed in the frame, at least one of the element terminals being a lead wire made of tantalum, the lead wire extending through the slit and outside the metal foil terminal on the one side of the frame and being bent at the outside surface of the metal foil terminal with the bent portion of the lead wire outside the metal foil terminal extending along the surface of the metal foil terminal and being welded to the metal foil terminal surface for being fixed thereto, the other element terminal being electrically connected to the other metal foil terminal.

Abstract: An anode comprising a porous sintered body made of tantalum powder each particle of which having a layer of at least one of V, Mo and Pd. This anode permits a solid electrolytic capacitor to have a low reverse current and a low leakage current. This invention also provides an effective method for preparing such anode.

Abstract: A method for making an electrolytic capacitor. A valve metal powder of the sponge type is compressed into a compact body and other usual steps including anodization and electrode application are carried out thereon. Mainly due to the use of sponge type valve metal powder, this method makes it unnecessary to carry out the conventionally employed step of sintering the compact body and produces an electrolytic capacitor having properties better than those obtained by the conventional method. This invention also provides an electrolytic capacitor characterized by the use of sponge type valve metal powder and specific lubricant materials.