Patents Assigned to Rorand (Proprietary) Limited
  • Insulating materials
    Patent number: 3936553
    Abstract: Insulation material comprising a pair of generally parallel spaced surface sheets of impervious material sealed together through thermally insulating material at their free edges. The surface sheets are held in spaced relation by a series of transverse pins spaced apart over the area of the surface sheets and the space between the latter is evacuated.
    Type: Grant
    Filed: November 23, 1973
    Date of Patent: February 3, 1976
    Assignee: Rorand (Proprietary) Limited
    Inventor: Alexander W. Rowe