Patents Assigned to Toho Kinzoku Co., Ltd.
  • Patent number: 5905938
    Abstract: A material for a semiconductor substrate is composed substantially of tungsten and/or molybdenum mixed with 5-30 wt. % copper, 0.002-0.07 wt. % phosphorus, and 0.1-0.5 wt. % one or two materials selected from among cobalt, nickel, and iron. The material is manufactured by mixing together tungsten powder and/or molybdenum powder of 1 .mu.m in particle size, copper powder of 7 .mu.m in particle size, and small amounts of an iron-group metal and phosphorus or phosphorus compound, molding the mixture at a pressure of 1.0 ton/cm.sup.2, and then, sintering the molded body at a temperature which allows solid and liquid to coexist below the melting point of copper.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: May 18, 1999
    Assignee: Toho Kinzoku Co., Ltd.
    Inventor: Naoyoshi Akiyoshi
  • Patent number: 5889220
    Abstract: Copper-tungsten alloys used for materials of electrode, electric contacts, package materials for semiconductors, heat sink and their manufacturing methods. The copper-tungsten alloy contains preferably 5 to 30 wt. % of copper, 0.002 to 0.04 wt. % of phosphor, the remaining portion being substantially all tungsten, and it is preferable to contain in these alloys 0.1 to 0.5% of cobalt, nickel or iron or else any combined two out of these three.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: March 30, 1999
    Assignee: Toho Kinzoku Co, Ltd
    Inventors: Naoyoshi Akiyoshi, Kimio Nakada, Katsumi Koda, Hiroyuki Yamabe, Masao Nakayama
  • Patent number: 5689796
    Abstract: The method of the invention is concerned with the manufacture of a molded copper-chromium family metal based alloy article which involves the steps of injection-molding a mixture of copper powder, a chromium family metal powder, an iron family metal powder and a thermoplastic organic binder made up of a polymer binder and low molecular binder in a ratio by volume of 5:1 to 1:1, dewaxing a molded body formed by the injection-molding by heating in a reducing atmosphere, and then sintering the dewaxed molded body at 1,100.degree. to 1,450.degree. C. in a reducing atmosphere. According to this method, molded articles having a high dimensional accuracy and high density can be provided.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: November 18, 1997
    Assignees: Citizen Watch Co., Ltd., Toho Kinzoku Co., Ltd.
    Inventors: Takao Kasai, Naoto Ogasawara, Naoyoshi Akiyoshi, Takeo Hamada
  • Patent number: 5512240
    Abstract: An arc discharge electrode material used for various electrode materials for arc welding, which is excellent in arc ignitability and consumability. The composition is 0.02 to 1.0 wt % lanthanum boride and the rest of tungsten.
    Type: Grant
    Filed: December 30, 1994
    Date of Patent: April 30, 1996
    Assignees: Toho Kinzoku Co., Ltd., Hokkai Tungsten Industrial Co. Ltd.
    Inventors: Fukuhisa Matusda, Masao Ushio, Kiyoyuki Hasegawa, Katsuyoshi Akabane, Takashi Matsuno
  • Patent number: 5123934
    Abstract: A cemented carbide tool of excellent wear resistance and fracture resistance includes a substrate of cemented carbide, and a ceramic coating layer by chemical vapor deposition. The thickness of the layer is in the range of between 2 .mu.m to 20 .mu.m, and the layer has cracks of such a depth that the cracks extend perpendicularly from a surface of the layer to the substrate. The cracks are formed in a network-like pattern to minutely divide the layer. The average value of the depths of the cracks in a direction perpendicular to the surface of the layer is not less than the thickness of the layer and not more than a value equal to the coating thickness plus 5 .mu.m. The average value of widths of the cracks is not more than 2 .mu.m. The average value of intervals between the cracks is not less than 10 .mu.m and not more than 100 .mu.m.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: June 23, 1992
    Assignees: Nippon Steel Corporation, Nippon Hardmetal Co., Ltd., Toho Kinzoku Co., Ltd.
    Inventors: Sakae Katayama, Masayuki Hashimura, Hiroto Imamura, Tetsuo Sawashima
  • Patent number: 4882519
    Abstract: Disclosed is a discharge electrode material essentially made of yttrium oxide and blended with rhenium or ruthenium. This electrode material is used as the electrode for air plasma cutting, electrode for plasma spraying, and others, and it is excellent in heat resistance and oxidation resistance, and its wear resistance is more than twice as high as that of conventional electrode materials such as zirconium and hafnium.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: November 21, 1989
    Assignee: Toho Kinzoku Co., Ltd.
    Inventors: Yoshinori Maeno, Hiroshi Mikita, Sadao Umezu, Fukuhisa Matsuda, Masao Ushio