Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8495977 | Intake and exhaust apparatus for four-stroke internal-combustion engine | Se Jin Song | 2013-07-30 |
| 8448613 | 8-stroke internal combustion engine | Se Jin Song | 2013-05-28 |