Patents by Inventor Mei Chee Choi

Mei Chee Choi 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: 9107540
    Abstract: A handheld electric mixer has a rotational output spindle for holding mixer work pieces, first and second gears located on the rotational output spindle, and a motor. The first gear is rotationally coupled to the motor output shaft. The mixer includes a two-speed gear-box receiving torque from the motor, and transmitting the torque to the output spindle. The two-speed gear-box includes a rotational lay shaft axially parallel to the rotational output spindle, third and fourth gears located on the lay shaft, the third gear meshing with the first gear and the fourth gear meshing with the second gear. A selector mechanism selects between a first gear ratio and a second gear ratio and includes a clutch disk on the spindle, and moveable axially for alternatively engaging and rotatably locking the one of the third or fourth gears that is engaged with the clutch disk.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: August 18, 2015
    Assignee: Main Power Electrical Factory Ltd.
    Inventors: Bo Gao, Mei Chee Choi
  • Publication number: 20120228968
    Abstract: A handheld electric mixer has a rotational output spindle for holding mixer work pieces, first and second gears located on the rotational output spindle, and a motor. The first gear is rotationally coupled to the motor output shaft. The mixer includes a two-speed gear-box receiving torque from the motor, and transmitting the torque to the output spindle. The two-speed gear-box includes a rotational lay shaft axially parallel to the rotational output spindle, third and fourth gears located on the lay shaft, the third gear meshing with the first gear and the fourth gear meshing with the second gear. A selector mechanism selects between a first gear ratio and a second gear ratio and includes a clutch disk on the spindle, and moveable axially for alternatively engaging and rotatably locking the one of the third or fourth gears that is engaged with the clutch disk.
    Type: Application
    Filed: April 23, 2012
    Publication date: September 13, 2012
    Applicant: MAIN POWER ELECTRICAL FACTORY LTD.
    Inventors: William Kwok Kay LEE, Mei Chee Choi, Bo GAO
  • Patent number: D677520
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: March 12, 2013
    Assignee: Zwilling J. A. Henckets AG
    Inventors: June Mei Chee Choi, Jun Wang