Patents by Inventor Shouichi Yamamoto

Shouichi Yamamoto 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).

  • Stationary induction apparatus
    Patent number: 6639497
    Abstract: Leakage fluxes from windings and leads of a stationary induction apparatus are confined within a tank. The stationary induction apparatus includes an electric functional units each including a winding and a core, a tank containing the electric functional units, high-voltage leads leading out from the windings, and low-voltage leads leading out from the windings. Magnetic shields are placed on the inner surface of a wall of the tank through which the high-voltage leads are drawn out of the tank, and a composite shield formed by combining nonmagnetic shields and magnetic shields is placed on the inner surface of a wall of the tank facing the low-voltage leads and is electrically short-circuited.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: October 28, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Yoshio Hamadate, Noriyuki Uchiyama, Sadamu Saito, Hiroyuki Fujita, Yasunori Ono, Shouichi Yamamoto, Kenichi Kawamura
  • Stationary induction apparatus
    Publication number: 20020196117
    Abstract: Leakage fluxes from windings and leads of a stationary induction apparatus are confined within a tank. The stationary induction apparatus includes an electric functional units each including a winding and a core, a tank containing the electric functional units, high-voltage leads leading out from the windings, and low-voltage leads leading out from the windings. Magnetic shields are placed on the inner surface of a wall of the tank through which the high-voltage leads are drawn out of the tank, and a composite shield formed by combining nonmagnetic shields and magnetic shields is placed on the inner surface of a wall of the tank facing the low-voltage leads and is electrically short-circuited.
    Type: Application
    Filed: September 4, 2002
    Publication date: December 26, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Yoshio Hamadate, Noriyuki Uchiyama, Sadamu Saito, Hiroyuki Fujita, Yasunori Ono, Shouichi Yamamoto, Kenichi Kawamura
  • Stationary induction apparatus
    Patent number: 6469607
    Abstract: Leakage fluxes from windings and leads of a stationary induction apparatus are confined within a tank. The stationary induction apparatus includes an electric functional units each including a winding and a core, a tank containing the electric functional units, high-voltage leads leading out from the windings, and low-voltage leads leading out from the windings. Magnetic shields are placed on the inner surface of a wall of the tank through which the high-voltage leads are drawn out of the tank, and a composite shield formed by combining nonmagnetic shields and magnetic shields is placed on the inner surface of a wall of the tank facing the low-voltage leads and is electrically short-circuited.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: October 22, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Yoshio Hamadate, Noriyuki Uchiyama, Sadamu Saito, Hiroyuki Fujita, Yasunori Ono, Shouichi Yamamoto, Kenichi Kawamura
  • Sulfonated polysulfone composite semipermeable membranes and process for producing the same
    Patent number: 4818387
    Abstract: A sulfonated polysulfone composite semipermeable membrane comprising a support membrane having laminated thereon in unity a semipermeable membrane composed of a sulfonated polysulfone formed by sulfonating a polysulfone composed of a recurring unit shown by formula (A) ##STR1## wherein n is an integer of 1 or more and process for producing the same.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: April 4, 1989
    Assignee: Nitto Electric Industrial Co., Ltd.
    Inventors: Kenichi Ikeda, Shouichi Yamamoto, Hiroki Ito