Patents by Inventor Steven Wang Pi Wen

Steven Wang Pi Wen 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).

  • Belt lifter mechanism for vacuum cleaner
    Patent number: 7937804
    Abstract: A drive belt shifting arrangement for a rotatable brush roller of an upright cleaner where the shifter has an idler pulley for arcuate movement within the loop of the belt between the roller and the motor occasioned by pedal actuation. The same pedal action by the user alternately cams the belt onto the idler pulley to discontinue roller rotation or to permit its movement back to the motor shaft to allow roller rotation.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: May 10, 2011
    Assignee: Royal Appliance Mfg. Co.
    Inventors: Chris Charlton, Steven Wang Pi Wen, Ng Wing Leung
  • Belt Lifter Mechanism for Floor Cleaning Appliance
    Publication number: 20090249580
    Abstract: A drive belt shifting arrangement for a rotatable brush roller of an upright cleaner where the shifter has an idler pulley for arcuate movement within the loop of the belt between the roller and the motor occasioned by pedal actuation. The same pedal action by the user alternately cams the belt onto the idler pulley to discontinue roller rotation or to permit its movement back to the motor shaft to allow roller rotation.
    Type: Application
    Filed: April 8, 2009
    Publication date: October 8, 2009
    Inventors: Chris Charlton, Steven Wang Pi Wen, Ng Wing Leung