Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838983 | Gas treatment apparatus and method | Norman E. Schumaker, Richard A. Stall, Craig R. Nelson | 1989-06-13 |
| 4828337 | Brake system for automotive vehicles | Lothar Schiel | 1989-05-09 |
| 4819544 | Two-stage reaction device for vacuum brake booster valves | — | 1989-04-11 |