Patents by Inventor Hungkun James Chang

Hungkun James 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).

  • Dynamo system having a freely moving flywheel in circular track
    Patent number: 7511400
    Abstract: A dynamo system comprises a flywheel mounted on a shaft intermediate its ends. A circular track in the dynamo system includes an inward groove structure to keep the ends of the shaft tracked inside while the flywheel rotating and spinning, the shaft's ends is dangling inside the circular track so that the shaft's ends will move freely along the circular course of the circular track while the flywheel rotates and spins.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: March 31, 2009
    Inventor: Hungkun James Chang
  • Crime scene fence post
    Patent number: 6935059
    Abstract: A crime scene fence post having a post base and an elongated post. The top end of the post has a lead-in notch, a slit, and a slot concatenated along the longitudinal axis of the post for easy installation and hold of a crime scene fence tape. The bottom end of the post has a tenon and the center of the post base has a mortise so that the post and the post base can be joined together to form a self-supported crime scene post.
    Type: Grant
    Filed: May 22, 2004
    Date of Patent: August 30, 2005
    Inventor: Hungkun James Chang