Patents Assigned to HSUEH-ER CHANG
  • Wheel apparatus
    Publication number: 20080018166
    Abstract: A wheel is designed to overcome special ground surfaces, like stairs. A carrying device can be equipped with at least one of such wheel so that a user can haul the carrying device to pass through special ground surfaces, like stairs, with ease and smoothness.
    Type: Application
    Filed: July 21, 2006
    Publication date: January 24, 2008
    Applicant: HSUEH-ER CHANG
    Inventor: Hsueh-Er Chang