Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4638846 | Method of making thin-walled ductile iron castings | Allen D. Ackerman, Conrad G. Perkey, Robert A. Martin | 1987-01-27 |
| 4372112 | Thin-walled exhaust gas manifold casting | Allen D. Ackerman, Conrad G. Perkey, Robert A. Martin | 1983-02-08 |