Patents Assigned to Nippon Rika Kogyosho Co., Ltd.
  • Mica tape and insulated coil using the same
    Patent number: 6153301
    Abstract: A mica tape formed by a paper-making process from a mixture of the mica particles and at least one selected from the group consisting of a short fiber made of a nitrogen-free organic material and a short fiber made of an inorganic material, and an insulated coil by winding the mica tape around a conductive coil and impregnating the mica tape with a solventless thermo-setting resin. The short fiber has an average diameter of 0.1 to 20 .mu.m and an average length of 0.5 to 10 mm.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: November 28, 2000
    Assignees: Kabushiki Kaisha Toshiba, Nippon Rika Kogyosho Co., Ltd.
    Inventors: Noriyuki Iwata, Hisayasu Mitsui, Hiroshi Hatano, Hideaki Nakatsu, Takuo Yoshida
  • High voltage electric appliance
    Patent number: 6017627
    Abstract: Disclosed is a high voltage electric appliance comprising electric coils whose conductors are wrapped by an insulating tape with subsequent impregnation of thermosetting resin for the electrical insulation. The insulating tape is a laminated body consisting of a built-up mica of fine mica particles and synthetic pulp or a paraffin powder and a reinforcing member. The bonding among the fine mica particles and between the fine mica particles and the reinforcing material is effected by the synthetic pulp as melted and solidified.
    Type: Grant
    Filed: October 6, 1997
    Date of Patent: January 25, 2000
    Assignees: Kabushiki Kaisha Toshiba, Nippon Rika Kogyosho Co., Ltd.
    Inventors: Noriyuki Iwata, Kenji Sakayanagi