Patents Assigned to Mitsui Wood Products, Inc.
  • Fireproof frame structure in a building opening portion
    Patent number: 4993203
    Abstract: A structure of a fireproof frame for building opening portions wherein a groove is formed over the entire circumference of a wood frame, which is disposed to a building opening portion, at the surface abutted against an opening member. A non-combustible heat forming sealing material is filled in the groove and the surface of the sealing material is covered with a thin film, which is excellent in heat conductivity, by means of the self bondability of said sealing material.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: February 19, 1991
    Assignee: Mitsui Wood Products, Inc.
    Inventors: Kiyoshi Tanaka, Kazushige Hori