Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5372027 | Controlled material flow hydroforming | Ralph E. Roper | 1994-12-13 |
| 5353618 | Apparatus and method for forming a tubular frame member | Ralph E. Roper, Douglas W. Tyger | 1994-10-11 |