Patents Assigned to William A. McAllister
  • Ladder and method of using ladder for escape
    Patent number: 4750587
    Abstract: An escape ladder at rest is an elongated cylindrical body divided lengthwise with a plurality of rung devices hingeably attached between rear quadrants and between front quadrants lockable in a horizontal position and foldable into the tubular body when left and right quadrants and mated together. Right quadrants and left quadrants are interlocked together to allow the interlocked quadrants to slideably move only lengthwise in relation to each other.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: June 14, 1988
    Assignee: William A. McAllister
    Inventors: William A. McAllister, Frederick Schindler