Patents by Inventor Heng Lye Chang

Heng Lye 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).

  • System for reducing wear and improving longevity of a electric submergible pumping system
    Patent number: 6424066
    Abstract: An electric submergible pumping system having a submergible electric motor with a unique rotor bearing system to promote longevity of the motor. The system includes an electric motor having a housing and a stator mounted within the housing. A shaft is rotatably mounted within the housing for rotation within an interior, axial passage through the stator. A rotor bearing assembly is disposed intermediate the stator and the shaft. The assembly includes a bearing sleeve mounted adjacent the shaft, and a main body portion disposed in sliding engagement with the bearing sleeve. A spring mechanism, such as a wave spring, is engaged with the main body portion. A bracelet is located between the spring mechanism and an interior surface of the stator. The spring mechanism biases the bracelet against the stator to prevent the body portion from rotating during rotation of the shaft.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: July 23, 2002
    Assignee: Camco International, Inc.
    Inventors: Arthur I. Watson, Thiam Hock Francis Tan, Heng Lye Chang, John Lee Yoon Kion