Patents Assigned to Mark R. Kelley
  • Plug for pier hole
    Patent number: 4911586
    Abstract: An inflatable, stretchable plug for obstructing a hole drilled in the ground for a foundation pier comprises a sturdy elastic envelope having an air valve mounted in the wall thereof for connection with outside supply of pressurized air and a handle bonded to upper portion of the envelope for easy removal of the plug from the hole before concrete mixture is poured in to produce the pier.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: March 27, 1990
    Assignee: Mark R. Kelley
    Inventors: Mark R. Kelley, Ronald P. Mackwood, John M. Broderick