Patents by Inventor Masahiro Ikegawa

Masahiro Ikegawa 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: 5497866
    Abstract: A current collecting apparatus provided with sliders 2 for collecting electric power from a power feeder 1, a current collector 3 for collecting power, an insulator for insulating and supporting the current collector 3, and a flexible conductor for delivering the power collected by the current collector 3 to a conductor 5, which is connected to the flexible conductor and used for supplying the power to the vehicle side. The conductor 5 and the insulator 4 are disposed so that the former is offset with respect to the latter in the crosswise direction of a railway vehicle. With this arrangement, aerodynamic noise emanating from the current collector loaded on the vehicle running at high speed can be substantially reduced.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: March 12, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Kobayashi, Yasushi Takano, Akiyoshi Iida, Masahiro Ikegawa, Syuya Hagiwara, Morishige Hattori
  • Patent number: 5207105
    Abstract: An apparatus in which a magnetic field is generated by an excitation coil provided in the outside of a conduit and electromotive force generated in electrodes attached on the conduit is detected to thereby measure a flow rate of a fluid flowing in the conduit, in which the conduit is made thinner in a manner so that a ratio of the axial length of the conduit to the inside diameter of the conduit is set to a value within a range of from 0.2 to 1.0, and in which correction data previously analyzed in accordance with magnetic permeability and inside surface conductivity of a mate piping to which the conduit is to be connected are stored so that a detection signal from the electrodes is corrected on the basis of the correction data to thereby measure the flow rate of the fluid flowing in the conduit.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: May 4, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Masao Fukunaga, Ikuo Uematsu, Masahiro Ikegawa, Masayuki Kaiho
  • Patent number: 4431980
    Abstract: A plurality of winding units each composed of a wire element are serially arranged in the axial direction of the winding between an inner insulating sleeve and an outer insulating sleeve, and vertical cooling paths are formed on opposite sides of each winding unit and horizontal cooling paths are formed between adjacent winding units. The winding units are divided into a plurality of winding sub-units to define a central vertical cooling path therebetween, which central vertical cooling path includes a via flow path and a branch inducing flow path, whereby cooling fluid flows in opposite directions and at substantially the same speed in the horizontal cooling paths along upper and lower surfaces of each of the winding units having the branch inducing flow path. In this manner, the entire winding is uniformly cooled.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: February 14, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Ikegawa, Takahiro Daikoku, Wataru Nakayama, Taisei Uede
  • Patent number: 4363012
    Abstract: Winding structure for static electrical induction apparatus such as transformers, reactors, or the like. A winding assembly is disposed in a space formed between a pair of inner and outer insulation continuous walls which are disposed in a container so as to commonly include the vertical axis of the container thereby defining the space therebetween. An inner vertical coolant passage is formed between the winding assembly and the inner insulation wall and an outer vertical coolant passage is also formed between the winding assembly and the inner insulation wall. The winding assembly is composed of a plurality of coil units stacked on one another in the vertical direction with separation at predetermined intervals so as to form horizontal coolant passages between vertically adjacent ones of the coil units, the inner and outer vertical coolant passages communicating with each other through the horizontal coolant passages.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: December 7, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Daikoku, Masahiro Ikegawa, Wataru Nakayama, Taisei Uede
  • Patent number: 4363013
    Abstract: Winding structure for static electrical induction apparatus such as transformers, reactors, or the like. A winding assembly is disposed in a space formed between a pair of inner and outer insulation continuous walls which are disposed in a container so as to commonly include the vertical axis of the container thereby defining the space therebetween. An inner vertical coolant passage is formed between the winding assembly and the inner insulation wall and an outer vertical coolant passage is also formed between the winding assembly and the inner insulation wall. The winding assembly is composed of a plurality of coil units stacked on one another in the vertical direction with separation at predetermined intervals so as to form horizontal coolant passages between vertically adjacent ones of the coil units, the inner and outer vertical coolant passages communicating with each other through the horizontal coolant passages.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: December 7, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Daikoku, Masahiro Ikegawa, Wataru Nakayama, Taisei Uede
  • Patent number: 4245206
    Abstract: Winding structure for static electrical induction apparatus such as transformers, reactors, or the like. A winding assembly is disposed in a space formed between a pair of inner and outer insulation continuous walls which are disposed in a container so as to commonly include the vertical axis of the container thereby defining the space therebetween. An inner vertical coolant passage is formed between the winding assembly and the inner insulation wall and an outer vertical coolant passage is also formed between the winding assembly and the inner insulation wall. The winding assembly is composed of a plurality of coil units stacked on one another in the vertical direction with separation at predetermined intervals so as to form horizontal coolant passages between vertically adjacent ones of the coil units, the inner and outer vertical coolant passages communicating with each other through the horizontal coolant passages.
    Type: Grant
    Filed: March 22, 1978
    Date of Patent: January 13, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Daikoku, Masahiro Ikegawa, Wataru Nakayama, Taisei Uede