| No | CD | Application No. | Name of Patent | Patentee | Status | Remarks | |
| 1 | UM | 20-2002-0002746 | 4 Cam System | Changhoon Lee | 13 years | Knife | |
| 2 | UM | 20-2002-0002747 | Embossing Air Filter | Changhoon Lee | 13 years | Rotary | |
| 3 | PT | 10-2001-0066345 | Binding System | Changhoon Lee | 11 years | Cabin Binding | |
| 4 | PT | 10-2002-0005005 | Pleating Device for Industrial Filter | Changhoon Lee | 11 years | Mini Pleat | |
| 5 | UM | 20-2004-0030459 | Height Control Device | Changhoon Lee | 10 years | M-Knife | |
| 6 | PT | 10-2003-0085576 | Auto Cutting System | Changhoon Lee | 10 years | Auto Cutter | |
| 7 | PT | 10-2006-0053985 | Continuous Cabind Binding Device | Changhoon Lee | 4 years | 4 Side Binding M/C |
|
| 8 | UM | 20-2009-0013224 | Cabin Binding Device | Changhoon Lee | 3 years | Mini Pleat Silicon Roller |
|
| 9 | PT | 10-2010-0054324 | Deep Pleat System | Changhoon Lee | 3 years | Eco-Mini | |
| 10 | PT | 10-2010-0054331 | Silicon Roller Device | Changhoon Lee | 3 years | Eco-Mini | |
