Patents by Inventor Takahisa Yoshihara

Takahisa Yoshihara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4569731
    Abstract: Steel strips are electrogalvanized with a Zn-Ni alloy deposit having the desired nickel content in a consistent manner for a long time by placing separate Zn and Ni soluble anodes in a chloride plating bath comprising major proportions of ZnCl.sub.2 and NiCl.sub.2 in an Ni/(Zn+Ni) ratio between 0.08 and 0.20 and a total molar amount of Zn+Ni of from 1 to 4 moles per liter, and b mole per liter of KCl and a mole per liter of NH.sub.4 Cl as shown in FIG. 8; passing a steel strip through the bath; and introducing currents to the soluble Zn and Ni anodes in a specific ratio given by equation (2).
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: February 11, 1986
    Assignee: Kawasaki Steel Corporation
    Inventors: Akira Matsuda, Akira Komoda, Takahisa Yoshihara, Kazuaki Miyachi
  • Patent number: 4541903
    Abstract: Steel strips are electroplated with a Zn-Fe base alloy containing 10 to 30% by weight of iron in a chloride bath which contains zinc and ferrous chlorides to give a total concentration of zinc and ferrous ions of from 1.0 mol/l to the solubility limit with a weight ratio of Fe.sup.2+ /Zn.sup.2+ between 0.10 and 0.35, and chloride ions in a total concentration of at least 6.0 mol/l under electrolytic conditions: pH 1.0-6.0, current density 80-200 A/dm.sup.2, and relative flow velocity 30-200 m/min. The bath may further contain a polycarboxylic acid such as citric acid and a Zn-Fe-P alloy plating may be deposited when the bath further contains hypophosphorous acid.
    Type: Grant
    Filed: October 30, 1984
    Date of Patent: September 17, 1985
    Assignee: Kawasaki Steel Corporation
    Inventors: Kazuaki Kyono, Shigeo Kurokawa, Hajime Kimura, Toshio Irie, Takahisa Yoshihara, Akira Matsuda
  • Patent number: 4500400
    Abstract: A counter flow device for a plating apparatus including a rotary drum with its substantially half part immersed in a plating solution in a plating bath, about which a metallic strip to be plated passes in synchronism with rotation of said rotary drum and anodes spaced apart by radial gaps from the strip for causing electric current to flow between the strip and the anodes. According to the invention the counter flow device comprises a bottom nozzle arranged at a bottom of the bath and directing in a direction substantially opposite to an entering direction of the strip thereat and a top nozzle having a nozzle opening whose tip end is immersed in the proximity of a surface of the plating solution at a location where the strip leaves the plating solution, thereby ensuring uniform counter flows over entire gaps between the metallic strip and anodes to remarkably increase critical current density in plating and advantageously realize uniform plating.
    Type: Grant
    Filed: July 3, 1984
    Date of Patent: February 19, 1985
    Assignee: Kawasaki Steel Corporation
    Inventors: Akira Komoda, Yasuhiro Hirooka, Takahisa Yoshihara, Akira Matsuda
  • Patent number: 4477491
    Abstract: One-side zinc hot dipped steel sheets are produced by coating one surface of a steel sheet with an aqueous slurry of an anti-plating agent based on MgO, alkali metal silicates, boric acid, MOH (M is an alkali metal) and the like and containing such additives as TiO.sub.2 and Al.sub.2 O.sub.3, heating the coated sheet for drying and baking, immersing the steel sheet with an anti-plating film in a molten zinc bath to zinc plate the other surface of the sheet, wetting the anti-plating film, and bending the steel sheet to cause the anti-plating film to peel off, thereby removing the anti-plating film from the steel sheet. This invention carries out the coating and baking of the anti-plating agent such that it is baked to a film having a thickness of 20 to 60 microns at a temperature of C. to about C.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: October 16, 1984
    Assignee: Kawasaki Steel Corporation
    Inventors: Kuniaki Sato, Hisao Yasunaga, Takahisa Yoshihara, Yoshinori Fujita, Kazuaki Kyono
  • Patent number: 4404030
    Abstract: Disclosed is an anti-plating agent for use in hot-dip plating process, having the following two kinds of composition. The composition of the first kind includes an alkali silicate; boric acid, and alkali hydroxide, magnesia and/or magnesium hydroxide, titania and/or titanium hydroxide, and at least one compound selected from a group consisting of alumina, aluminium hydroxide and alumina zol. The composition of the second kind includes an alkali silicate, boric acid, alkali hydroxide, magnesia and/or magnesium hydroxide, alumina and/or aluminium hydroxide, and at least one kind of titanium oxide and titanium complex oxide and/or at least one kind of zirconium oxide and zirconium complex oxide. These anti-plating agents have a good anti-plating effect and permit an easy separation of the coating film and, hence, can suitably be used in one-side hot-dip plating of steel sheets.
    Type: Grant
    Filed: March 23, 1982
    Date of Patent: September 13, 1983
    Assignee: Kawasaki Steel Corporation
    Inventors: Hideo Komura, Kazuaki Kyohno, Takahisa Yoshihara, Syoji Shijima, Minari Goto
  • Patent number: 4036600
    Abstract: A composite zinc-aluminum dispersion plated steel sheet and a method of producing same are disclosed. The plated steel sheet comprises an electrolytical zinc plated layer containing 1.5 to 70% by weight of aluminum dispersed therein. The method comprises adding aluminum powder to an electrolytical zinc plating bath composition, dispersing the aluminum powder into the plating bath to provide a composite zinc-aluminum dispersion plating bath, and electrolytical treating a steel sheet in the composite zinc-aluminum dispersion plating bath while agitating it. The plated steel sheet enhances corrosion resistances and does not show any spangles which impair the appearances after subsequent painting of the plated steel sheet.
    Type: Grant
    Filed: May 27, 1976
    Date of Patent: July 19, 1977
    Assignee: Kawasaki Steel Corporation
    Inventors: Hajime Kimura, Takahisa Yoshihara, Shunichi Harada
  • Patent number: 3997301
    Abstract: A tin-electroplated steel sheet having an excellent sulfur resisting property and excellent smudge resisting property is disclosed. The tin-electroplated steel sheet comprises a cold rolled low carbon steel sheet substrate, a layer consisting of 1 to 15 g/m.sup.2 of electroplated tin, said layer being electroplated upon at least one side surface of said substrate and a layer consisting of 0.0071 to 0.71 g/m.sup.2 of zinc, said layer being plated upon the tin layer.
    Type: Grant
    Filed: February 11, 1976
    Date of Patent: December 14, 1976
    Assignee: Kawasaki Steel Corporation
    Inventors: Takahisa Yoshihara, Hajime Kimura