Patents Assigned to Duncan Technologies
  • Methods and apparatus for delaminating sedimentary mica
    Patent number: 5797547
    Abstract: A superior grade of flake mica product may be produced by applying shear forces to sedimentary mica to delaminate it into flakes. Shear forces are applied by rotating a plurality of arcuate blades within a confined cylindrical chamber containing the mica, such that the mica is forced between an outer portion of each blade and the chamber. Each one of the arcuate blades is curved to define an end portion that is spaced from, and substantially concentric with, a portion of the cylindrical chamber.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: August 25, 1998
    Assignee: Duncan Technologies
    Inventor: Donald H. Duncan