Patents Assigned to Multi-Products, Incorporated
  • Method of making a mold
    Patent number: 5515903
    Abstract: A method is disclosed for making molds for use in injection molding wherein a cement replica is made of a pattern by curing the cement in a silicon rubber negative of the pattern, then pouring molten zinc or zinc alloy into a frame containing the cement replica. The cooling of the mold metal is controlled by the direct application of flame and frequent adjustments of clamps which firmly contact the mold to a solid surface.
    Type: Grant
    Filed: June 19, 1995
    Date of Patent: May 14, 1996
    Assignee: Multi-Products, Incorporated
    Inventors: John J. Hronas, Michael J. Hronas