Patents Assigned to NTN-Rulon Industries, Ltd.
  • Extruded porous articles of polyimide and continuous preparation of the same
    Patent number: 4942092
    Abstract: An extruded porous article, which can be prepared by a ram-extruding method, comprising an aggregated aromatic polyimide powder which has a heat loss ratio of not more than 2 wt. %, the heat loss ratio being measured at 360.degree. C. for 1 hour, and a mean particle size in the range of 1 to 40 .mu.
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: July 17, 1990
    Assignees: UBE Industries, Ltd., NTN-Rulon Industries, Ltd.
    Inventors: Seiichirou Takabayashi, Masaki Egami