Patents by Inventor Sun B. Cha

Sun B. Cha 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).

  • Power driven wrench
    Patent number: 6739221
    Abstract: A power driven wrench which comprises a handle housing containing a power source and a motor disposed therein, a motor gear coaxially connected to the motor, a head housing united with said handle housing as a unit, said head housing containing a hexagonal, cutout socket receiving head gear adapted to receive a socket for engaging various types of nuts and bolts. A plurality of gears connecting the motor gear with the head gear, and a plurality of top ball bearing sets and bottom ball bearing sets, which are spring biased to engage a top surface and a bottom surface of the head gear.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: May 25, 2004
    Inventor: Sun B. Cha
  • POWER DRIVEN WRENCH
    Publication number: 20040069096
    Abstract: A power driven wrench which comprises a handle housing containing a power source and a motor disposed therein, a motor gear coaxially connected to the motor, a head housing united with said handle housing as a unit, said head housing containing a hexagonal, cutout socket receiving head gear adapted to receive a socket for engaging various types of nuts and bolts. A plurality of gears connecting the motor gear and the head gear, and a plurality of top ball bearing sets and bottom ball bearing sets, which are spring biased to engage top surface and a bottom surface of the head gear.
    Type: Application
    Filed: October 10, 2002
    Publication date: April 15, 2004
    Inventor: Sun B. Cha