Patents Assigned to Okabe Mica Co., Ltd.
  • Carrier for supporting workpiece to be polished
    Patent number: 5085009
    Abstract: A carrier for supporting workpieces to be polished is composed of an integrated mica laminated sheet. The mica laminated sheet is impregnated with a thermo-setting resin. The carrier has a low warp ratio and can be made thin with a sufficient mechanical strength and accuracy of thickness.
    Type: Grant
    Filed: April 23, 1990
    Date of Patent: February 4, 1992
    Assignees: Sekisui Kagaku Kogyo Kabushiki Kaisha, Okabe Mica Co., Ltd., Fuji Spinning Co., Ltd.
    Inventors: Akira Kinumura, Katsuhiko Koretomo, Shuichi Yura, Tatsuhiko Kuwano, Tsuguji Kimura
  • Reconstituted mica acoustic diaphragm
    Patent number: 4026384
    Abstract: An acoustic diaphragm composed essentially of a flat, cone-like or dome-like reconstituted mica paper of fine scaly mica flakes and an organic polymeric binder impregnated in the mica paper. The diaphragm has a density of 1.3 to 2.3 g/cm.sup.3 and a Young's modulus of 6 .times. 10.sup.10 to 3 .times. 10.sup.12 dyne/cm.sup.2.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: May 31, 1977
    Assignee: Okabe Mica Co., Ltd.
    Inventors: Kenzabro Yamachika, Ituro Sonoda, Ichimatsu Kishimoto, Masaaki Matsushima