Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5272872 | Method and apparatus of on-board catalytic converter efficiency monitoring | Peter John Grutter | 1993-12-28 |
| 5159810 | Catalytic converter monitoring using downstream oxygen sensor | Peter John Grutter, John Cushing, Alexander Y. Gopp | 1992-11-03 |