Patents by Inventor Tetsuya Akahoshi

Tetsuya Akahoshi 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).

  • Combined steel sheet pile, diaphragm wall, and method of disassembling combined steel sheet pile
    Patent number: 9512590
    Abstract: A method of disassembling a combined steel sheet pile in which a steel sheet pile and an H-shaped steel are joined to each other, in which, when viewed in a cross-section perpendicular to a longitudinal direction, in a weld zone formed by a fillet weld, the weld zone is cut off to leave a portion on a side which is closer to the steel sheet pile than a throat depth surface, and thereby the combined steel sheet pile is disassembled into the steel sheet pile and the H-shaped steel.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: December 6, 2016
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Ryosuke Nagatsu, Shigeki Terasaki, Kei Teshima, Tetsuya Akahoshi
  • COMBINED STEEL SHEET PILE, DIAPHRAGM WALL, AND METHOD OF DISASSEMBLING COMBINED STEEL SHEET PILE
    Publication number: 20140138427
    Abstract: A method of disassembling a combined steel sheet pile in which a steel sheet pile and an H-shaped steel are joined to each other, in which, when viewed in a cross-section perpendicular to a longitudinal direction, in a weld zone formed by a fillet weld, the weld zone is cut off to leave a portion on a side which is closer to the steel sheet pile than a throat depth surface, and thereby the combined steel sheet pile is disassembled into the steel sheet pile and the H-shaped steel.
    Type: Application
    Filed: July 13, 2012
    Publication date: May 22, 2014
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Ryosuke Nagatsu, Shigeki Terasaki, Kei Teshima, Tetsuya Akahoshi
  • Optical wavelength monitoring system and stabilizing system
    Patent number: 6580513
    Abstract: The wavelength of light modulated according to a modulating signal is monitored by generating criterion light having a stable wavelength, combining part of the modulated light with the criterion light, comparing the combined light with the modulating signal, and calculating an error rate indicating how frequently the combined light disagrees with the modulating signal. A high error rate indicates that the modulated light has the same wavelength as the criterion light, leading to interference when the two are combined. In a monitoring system, an alarm signal is output if the error rate is too low. In a wavelength stabilizing system, the wavelength of the modulated light is controlled so as to maximize the error rate.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: June 17, 2003
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Tetsuya Akahoshi
  • Optical wavelength monitoring system and stabilizing system
    Publication number: 20020093661
    Abstract: The wavelength of light modulated according to a modulating signal is monitored by generating criterion light having a stable wavelength, combining part of the modulated light with the criterion light, comparing the combined light with the modulating signal, and calculating an error rate indicating how frequently the combined light disagrees with the modulating signal. A high error rate indicates that the modulated light has the same wavelength as the criterion light, leading to interference when the two are combined. In a monitoring system, an alarm signal is output if the error rate is too low. In a wavelength stabilizing system, the wavelength of the modulated light is controlled so as to maximize the error rate.
    Type: Application
    Filed: September 27, 2001
    Publication date: July 18, 2002
    Inventor: Tetsuya Akahoshi