Patents Assigned to Leach & Dillon, Inc.
  • Method and device for eliminating compression and distortion of wax patterns in lost-wax casting
    Patent number: 5655592
    Abstract: Compression and distortion on a wax pattern during curing are eliminated by employing a thermochromatic dye which changes color when investment material sets. By monitoring the dye, the set investment material can be removed from the assembly before curing, eliminating compression forces on the wax pattern from the exothermic curing process expanding the investment material against the constraints of the assembly.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: August 12, 1997
    Assignee: Leach & Dillon, Inc.
    Inventor: Michael R. Sullivan