Patents Assigned to Ohta Kasei Corporation
  • Casting stalk
    Patent number: 5558801
    Abstract: The core of the stalk is a metallic cylindrical body 1, such as a steel pipe. On an inner surface of the cylindrical body are layered a boron nitride coating 4, a mica sheet 6 which is airtight and thermal insulating, and a thermal insulating layer 7. On the outer surface of metallic cylindrical body 1 are layered a boron nitride coating 5, a wire gauze 10, a thermal insulating layer 12, a ceramic paper 13, and another boron nitride coating 15. The cylindrical body can be formed by a steel pipe is easily corroded and eroded by molten metal.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: September 24, 1996
    Assignees: Nichias Corporation, Ohta Kasei Corporation
    Inventors: Mikio Tsukahara, Noboru Ohishi, Hisao Taguchi, deceased