Abstract: The present invention provides a cage, for a rolling bearing, whose surface is silver-plated by using a barrel plating method capable of improving the durability thereof in a sliding test. In the cage, for the rolling bearing, made of an iron metal material and having a precious metal-plated layer formed on a surface thereof, the precious metal-plated layer is formed on a base plated layer formed on a surface of the iron metal material by using a barrel electroplating method. A surface of the base plated layer consists of a smooth surface. The precious metal-plated layer is in direct close contact with the smooth surface. The base plated layer consists of a metal having a higher ionization tendency than the precious metal formed on the surface of the base plated layer. A cavity is not present at an interface between the copper-plated layer and the silver-plated layer.

Abstract: The present invention provides a cage, for a rolling bearing, whose surface is silver-plated by using a barrel plating method capable of improving the durability thereof in a sliding test. In the cage, for the rolling bearing, made of an iron metal material and having a precious metal-plated layer formed on a surface thereof, the precious metal-plated layer is formed on a ground plated layer formed on a surface of the iron metal material by using a barrel electroplating method. A surface of the ground plated layer consists of a smooth surface. The precious metal-plated layer is in direct close contact with the smooth surface. The ground plated layer consists of a metal having a higher ionization tendency than the precious metal formed on the surface of the ground plated layer. For example, the precious metal forming the plated layer formed on the surface of the ground plated layer is silver, whereas the ground plated layer is a copper-plated layer.

Abstract: A biotechnological process for the production of betacyanin pigments is disclosed which comprises cultivating calli, induced from a plant which belongs to Beta vulgaris L. and which is capable of producing betacyanin pigments, in a liquid culture medium containing a reducing agent such as glutathione.

Abstract: A method for producing a stigma-like tissue of a saffron flower comprising (1) culturing a corolla tube of a saffron in the presence of a plant hormone or (2) culturing a female organ and/or a corolla tube of a saffron flower in the presence of a plant hormone and alanine, and a method for producing useful components of a saffron flower, e.g., saffron pigment, from the thus produced stigma-like tissue. The tissue cultures produce larger quantitites of the stigma-like tissue and useful components, compared to that obtained by conventional tissue cultures.

Abstract: A method of producing a brassinosteroid is disclosed, wherein crown gall cells capable of producing the brassinosteroid are cultured in a culture medium in the presence of a cultivation aid selected from auxins, sterols, squalene, casamino acid and mixtures thereof.

Abstract: A powder coating composition is disclosed which includes an epoxy resin which is solid at room temperature, and a curing agent, characterized in that the curing agent includes an adduct obtained by reaction of (a) a polyfunctional epoxy resin, (b) an imidazole compound having a secondary amino group in the imidazole ring thereof and (c) a polyhydric phenol.

Abstract: A resist ink composition suitable for forming a masking pattern resistive against chemical attack by a chemical plating liquor is disclosed which comprises:a phenol novolak epoxy resin having an epoxy equivalent of 170-250;a phenol novolak resin having a softening point of 60.degree.-130.degree. C.;a montmorillonite organic complex such as bentonite ion-exchanged with an organic cation;a curing-accelerating catalyst; andan organic solvent.

Abstract: A method of manufacturing a self-locking threaded element includes the steps of disposing a blank element in which the self-locking threads are to be formed between two spaced rolling dies, contacting the start ends of each die with the blank element such that one die extends from its start end to its finish end in one direction and the other die extends from its start end to its finish end in an opposite direction, applying a pressure to the rolling dies, moving the two rolling dies in opposite directions a first distance, rotating the blank element a first amount as the two dies are moved the first distance causing the two oppositely moving dies to form a helical first groove in the rotating blank element, moving the dies in such opposite direction a second distance, rotating the blank element a second amount as the two dies are moved such second distance causing the two oppositely moving dies to superimpose a second deeper groove over alternate first grooves such that the deeper grooves define the flanks o

Abstract: A rolling flat die operable on a blank to produce a threaded element having self-locking threads includes a flat die moveable in a forward direction to engage the blank and form the self-locking threads on the blank. The flat die has a first section and a second section, the first section having a first plurality of first thread-forming parts having a first outer crest and a first inner root, the second section having a plurality of second thread-forming parts parallel to one another and parallel to the first thread-forming parts, each of the second thread-forming parts having a second outer crest and a second inner root.

Abstract: A self-locking screw has a longitudinal axis and comprises a thread having an inner radial portion and an outer radial portion, the inner radial portion having a pair of opposite first side faces defining a flank angle of the screw. The outer radial portion has a pair of opposite second side faces extending from the first side faces and first and second outer radial faces extending respectively from the pair of opposite second side faces. The thread has a central buffer groove having two groove side walls, the groove side walls along with the second side faces and the first and second outer radial faces defining two axial spaced elastically deformable thread portions which are elastically deformable such that as the thread is threaded onto a counterpart threaded member, the elastically deformable thread portions are engaged by the counterpart threaded member to cause elastic deformation as the thread portions axially approach one another and reduce the spacing between the thread portions.

Abstract: A method of manufacturing an optical fiber having no defect in the refraction index profile comprising manufacturing a bare fiber by heating and extending a core starting material and forming a cladding layer on said core to produce a double-layer of the core and cladding with different refraction indices. Fine granules of oxide for the glass cladding can be formed by vapor deposition on the bare fiber, and these can be fused to form the cladding by heating. Another method for forming the cladding layer is to pass the bare fiber for the core through a fine hole provided at the bottom of a crucible in which the glass for the cladding is contained in liquid form.

Abstract: There is provided a filament of improved light transmission having a sheath-core composite structure formed of a methyl methacrylate polymer core material and a fluorine-containing polymer sheath material. The light transmitting filament is characterized in that the methyl methacrylate polymer core material is prepared by the specific procedure of continuous bulk polymerization and subsequent removal of volatile contents, wherein the polymerization is performed in a continuously and thoroughly stirred reaction vessel at a low catalyst concentration and a relatively high temperature and with improved conversion. The light transmitting filament possesses an absorption coefficient (k) of no greater than 6 .times. 10.sup.-.sup.3 cm.sup.-.sup.1.

Abstract: A novel unitary spun polyester composite filament is provided. The composite filament consists essentially of (a) a block copolymer, as the first component, having a melting point of not lower than 170.degree.C and consisting essentially of 35-80 wt. % of a polyester, as the hard segment, predominantly containing a tetramethylene terephthalate unit and 20-65 wt. % of a long-chain glycol having a molecular weight of 500 to 5,000 as the soft segment, and (b) a polyester, as the second component, predominantly containing a tetramethylene terephthalate unit. The composite filament produces crimps superior particularly in percent of crimp and percent of crimp retentivity when drawn and relaxed.