Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4798369 | Ultrasonic air spring system | David A. Weitzenhof | 1989-01-17 |
| 4796870 | Suspension system for vehicles containing combination isolator mount and air spring closure | Keith E. Hoffman | 1989-01-10 |