|Feb. 2010||Obtains a patent for "Double Shock Absorbing Casters "
under PAT No.4458960
|Sep. 2010||Obtains a patent for "Shock Absorbing Casters V -Torsion spring type-"
under PAT No.4579285
|Dec. 2010||Obtains a patent for "Shock Absorbing Casters I-B -Advanced coil spring type-"
under PAT No.4651658
|Sep. 2015||Obtains a patent for "Safety lock castor"
under PAT No.5800651
|Dec. 2016||Obtains a patent for "The device that can adjust seat inclination angle and the wheelchair to which this device is mountedr"
under PAT No.6052693