Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7537070 | Autonomous portable range extender | Boris Maslov, Chahee P. Cho | 2009-05-26 |
| 7449793 | Portable range extender with autonomous control of starting and stopping operations | Chahee P. Cho | 2008-11-11 |
| 7259664 | Sensorless fuel level and oil change indicators | Chahee P. Cho | 2007-08-21 |
| 7224132 | Portable range extender operable in automatic and manual modes | Chahee P. Cho | 2007-05-29 |