Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5644912 | System for diagnosing deterioration of catalyst in exhaust system of internal combustion engine | — | 1997-07-08 |
| 5644073 | Diagnostic system for variable valve timing control system | Osamu Matsuno | 1997-07-01 |