Patents Assigned to Specialised Polyurethane Applications Pty. Ltd.
  • Borehole plug and method
    Patent number: 4846278
    Abstract: An inflatable borehole plug is disclosed, the inflation of which is achieved by chemical reaction of two co-reagents disposed therein which results in evolution of a gas. The borehole plug can be dropped or lowered down a borehole to a preselected position since the extent of gas-producing chemical reaction is able to be delayed following initiation of mixing of co-reagents, by delay means in the borehole plug, for sufficient time to enable placement of the borehole plug.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: July 11, 1989
    Assignees: Du Pont (Australia) Ltd., Mount Isa Mines Limited, Specialised Polyurethane Applications Pty. Ltd.
    Inventor: Geoffrey Robbins