Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6067848 | Portable tire uniformity measurement system and method | James F. Siegfried, Donald E. Andrews, Gregory D. Chaplin | 2000-05-30 |
| 5448910 | Portable tire uniformity test machine | Martin A. Yurjevich, David A. Johnson, James F. Siegfried, Donald E. Andrews | 1995-09-12 |