Patents Assigned to Kyocera Kabushiki Kaisha
  • Mold for use in dental precision casting
    Patent number: 4682644
    Abstract: In casting metals for dental prosthetic use, superior dental castings free from shrinkage cavities can be obtained by delaying the cooling and solidification of molten metal in mold members such as a sprue, runner and gate and, if necessary, a molten metal reservoir into which the molten metal is poured. Such delay in cooling and solidification can be achieved either by forming the sprue and the like from a heat resisting ceramic tubular body or by further forming a heat insulating layer on the outer periphery of the tubular body.
    Type: Grant
    Filed: December 6, 1983
    Date of Patent: July 28, 1987
    Assignee: Kyocera Kabushiki Kaisha
    Inventor: Masato Ueno
  • Nonoxide ceramic ball-point pen ball
    Patent number: 4653950
    Abstract: This invention relates to a ball-point pen ball made of nonoxide ceramic and formed into a spherical body whose surface contains voids each having an average pore diameter of less than 75 .mu.m and more than 0.1 .mu.m. The ball thus made is not only almost free from "ball sunk", "nonuniformity in writing line thickness", "ball break", etc. but also excellent in affinity with ink and assures steady writing characteristic over a long period of time.
    Type: Grant
    Filed: September 6, 1985
    Date of Patent: March 31, 1987
    Assignee: Kyocera Kabushiki Kaisha
    Inventor: Haruo Yoshida