Patents Assigned to American International Materials, Ltd.
  • Process for recycling gypsum-based waste material into readily crushable members for use in the manufacture of cement and crushable members formed thereby
    Patent number: 6471767
    Abstract: A process for forming crushable, “synthetic” rocks from waste gypsum involves collecting natural and synthetic gypsum waste in the form of flue gas desulfurization (“FGD”). The gypsum waste has a sludge-like consistency and is passed through an extruder where the moisture in the waste gypsum is drawn off and the waste is densified. The removal of moisture is accomplished under vacuum. The densified waste gypsum is extruded through a die to create three-dimensional shapes with preselected aspect ratios.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: October 29, 2002
    Assignee: American International Materials, Ltd.
    Inventor: Jeffrey J. Konczak