Patents by Inventor Youngjian Tang

Youngjian Tang 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).

  • SURFACE MOTOR DIRECT-DRIVE SUCKER-ROD SCREW PUMP DEVICE
    Publication number: 20140197767
    Abstract: A surface motor direct-drive sucker-rod screw pump device is driven by a vertical three-phase permanent magnet brush-less DC motor, and comprises a motor controller (6), a rectifying circuit, an inversion circuit, a CPU and a driving circuit. The motor controller (6) is used to adjust the voltage and frequency of the motor by the rectifying circuit, the inversion circuit, the CPU and the driving circuit. Thus, the speed of the motor can vary from zero to the maximum. The device is easy to operate and has a higher efficiency.
    Type: Application
    Filed: March 7, 2014
    Publication date: July 17, 2014
    Applicant: Millennium Oilflow Systems & Technology Inc.
    Inventors: Jun Liu, Songbo Gou, Youngjian Tang, Hengli Cong