Patents by Inventor Takao Yokokawa

Takao Yokokawa 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).

  • Gas pressure welding process
    Patent number: 4121748
    Abstract: In an automatic gas pressure welding system wherein a couple of steel members are butted, the butted section is subjected to heating in a pressed state, to thus cause the steel members to be subjected to pressure welding. The pressing and heating periods are controlled in conformity with the amount of contraction of the heated section of the steel members.
    Type: Grant
    Filed: April 7, 1976
    Date of Patent: October 24, 1978
    Assignee: Nippon Steel Corporation
    Inventors: Takao Yokokawa, Shigeo Takano, Yasuaki Ichinose, Toshiyuki Kasahara, Fumiaki Ikeda
  • Gas pressure welding system
    Patent number: 4103815
    Abstract: In an automatic gas pressure welding system wherein a couple of steel members are butted, the butted section is subjected to heating in a pressed state, to thus cause the steel members to be subjected to pressure welding. The pressing and heating periods are connected in conformity with the amount of contraction of the heated section of the steel members.
    Type: Grant
    Filed: February 4, 1977
    Date of Patent: August 1, 1978
    Assignee: Nippon Steel Corporation
    Inventors: Takao Yokokawa, Shigeo Takano, Yasuaki Ichinose, Toshiyuki Kasahara, Fumiaki Ikeda
  • Free-cutting graphitic steel
    Patent number: 4061494
    Abstract: A free cutting graphitic steel comprising:Si: from more than 1.5 to 2.3%Mn: 0.1 to 0.7%S: not more than 0.015%One or both Al and Ti: 0.015 to 0.1% in totalRare earth: 0.01 to 0.2% andSpheroidized graphite: 0.20 to 0.90% with the balance being iron and unavoidable impurities,Said spheroidized graphite being distributed at a ratio of more than particles 50/mm.sup.2.
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: December 6, 1977
    Assignee: Nippon Steel Corporation
    Inventors: Takao Yokokawa, Shogo Kanazawa, Yasuo Otoguro, Nobukazu Suzuki, Sigeyuki Akase, Noboru Miida, Tadahisa Akazawa, Kazuya Kuroiwa
  • Conical washer for a high tensile strength bolt
    Patent number: 3992974
    Abstract: The hollow truncated cone of this washer is characterized in that it deforms plastically before it is flattened and deformation load becomes substantially constant during progress of the plastic deformation. Furthermore, the relationship between the yield stress of the cone, the composition of the metal comprising the cone, and the dimensions of the cone may be defined by a constant .gamma..
    Type: Grant
    Filed: April 8, 1975
    Date of Patent: November 23, 1976
    Assignee: Nippon Steel Corporation
    Inventors: Takeshi Miki, Toshitaka Tamano, Takao Yokokawa