Patents by Inventor Jae Eon Chang

Jae Eon Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for controlling temperature of mold for injection molding
    Patent number: 6224813
    Abstract: Disclosed is a method for controlling the temperature of a mold for injection molding. The temperature of a front surface portion of an upper mold neighbored a gate which is connected to a spool to which the melted resin is injected through a runner, is controlled as 65-75° C. The temperature of a side surface portion of the upper mold between the front surface portion and a parting line, is controlled as 45-55° C. Then, a cavity portion corresponding to the upper mold is formed. The temperature of a core portion which is positioned at a concave portion of a mould product, is controlled as 35-45° C. The generation of a weld line or a chromic aberration can be restrained.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: May 1, 2001
    Assignee: Daewoo Electronics Co., Ltd.
    Inventor: Jae Eon Chang