Patents by Inventor Jung C. Chang

Jung C. 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).

  • Patent number: 4932294
    Abstract: A DIY electric hand tool is provided to include a hand grip portion. A battery received in the interior of the hand grip portion supplies electric power necessary for the operation of the hand tool. A lower end of the hand grip portion is enclosed by two half-shells pivotably mounted thereto. an inner space suitable to accommodate tool heads and having a lower end opening is formed between the walls of the hand grip portion and the walls of the half-shells. A tool head receiving plate assembly has means for attaching it to a bottom end of the battery with the battery being located centrally on an upper surface of the plate assembly when they are held together. Along each of two longer edges of the plate assembly is provided with a plurality of tool head receptacles, each of which is suitable to receive a tool head.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: June 12, 1990
    Inventor: Jung C. Chang
  • Patent number: 4912349
    Abstract: A DIY (Do It Yourself) electric hand tool is provided to include a front segment and a rear segment which may be pivotably coupled to each other at one respective end thereof. A latching mechanism is provided between the coupled respective ends of the front and rear segments so that one of the front and rear segments may selectively be pivoted relative to the other of the front and rear segments to and be latched in one of a first position and a second position which endows the DIY electric hand tool with a configuration which fits the DIY tool to a specific working environment.
    Type: Grant
    Filed: May 16, 1989
    Date of Patent: March 27, 1990
    Inventor: Jung C. Chang
  • Patent number: D323606
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: February 4, 1992
    Inventor: Jung C. Chang