Patents by Inventor Sumihisa Aoki

Sumihisa Aoki 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: 5705125
    Abstract: A wire for electric railways comprises a copper alloy which consists essentially, by weight percent, of 0.1 to 1.0% Cr, 0.01 to 0.3% Zr, 0.05 to 0.15% Sn, and 10 ppm or less O, and if required, further contains 0.01 to 0.1% Si, or 0.01 to 0.1% Si and 0.001 to 0.05% Mg, with the balance being Cu and inevitable impurities.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: January 6, 1998
    Assignees: Mitsubishi Materials Corporation, Railway Technical Research Institute
    Inventors: Motoo Goto, Shizuo Kawakita, Yoshiharu Mae, Takuro Iwamura, Yutaka Koshiba, Kenji Yajima, Syunji Ishibashi, Hiroki Nagasawa, Atsushi Sugahara, Sumihisa Aoki, Haruhiko Asao
  • Patent number: 5391243
    Abstract: A wire for electric railways comprises a copper alloy which consists essentially, by weight percent, of 0.1 to 1.0% Cr, 0.01 to 0.3% Zr, and 10 ppm or less O, and if required, further contains at least one element selected from the group consisting of 0.01 to 0.1% Si and 0.001 to 0.05% Mg, with the balance being Cu and inevitable impurities. The wire is manufactured by hot working a copper alloy billet having the above composition, immediately quenching the hot worked billet to prepare an element wire, cold working the element wire at least once, and subjecting the cold worked element wire to aging treatment.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: February 21, 1995
    Assignees: Mitsubishi Materials Corporation, Railway Technical Research Institute
    Inventors: Motoo Goto, Shizuo Kawakita, Yoshiharu Mae, Takuro Iwamura, Yutaka Koshiba, Kenji Yajima, Syunji Ishibashi, Hiroki Nagasawa, Atsushi Sugahara, Sumihisa Aoki, Haruhiko Asao
  • Patent number: 5087300
    Abstract: First, a steel wire is continuously dipped in molten copper or molten copper alloy so that copper or copper alloy builds up and solidifies on the peripheral surface of said steel wire, thereby obtaining an initial copper-clad steel wire. Then, the initial copper-clad steel wire is subjected to a first cycle of hot rolling by a caliber roll. The hot-rolled wire is dipped in molten copper or molten copper-alloy at least once so that copper or copper alloy builds up and solidifies thereon, thereby obtaining a final copper-clad steel wire.The final copper-clad steel wire is hot-rolled at a temperature of 750.degree. to 850.degree. C. and with a rolling ratio of 10 to 40%. Then, the hot-rolled wire is cold-rolled with a reduction of area of 20% or more.Thus, 75 to 95% of the cross sectional area of the obtained copper-clad steel trolley wire is occupied by the copper or copper alloy covering layer so that the electric conductivity of the trolley wire is as high as 80% IACS or more.
    Type: Grant
    Filed: August 22, 1990
    Date of Patent: February 11, 1992
    Assignee: Fujikura Ltd.
    Inventors: Teruyuki Takayama, Hiroki Nagasawa, Sumihisa Aoki, Haruo Tominaga, Kazuo Yokoyama