Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6658841 | Method for checking a three-way exhaust catalytic converter of an internal-combustion engine | Hong Zhang | 2003-12-09 |
| 6539705 | Method for monitoring and exhaust-gas catalytic converter of an internal combustion engine | Hong Zhang | 2003-04-01 |