Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4428106 | Method of making double wall tubing assembly | Bonnie J. Campbell, James L. Cunningham, Karl J. Youtsey | 1984-01-31 |
| 4343350 | Double wall tubing assembly and method of making same | Bonnie J. Campbell, James L. Cunningham, Karl J. Youtsey | 1982-08-10 |