Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4998658 | Drilled unported vacuum drum with a porous sleeve | Joseph DiStefano, Roger A. Haas, Fred Kelley | 1991-03-12 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4998658 | Drilled unported vacuum drum with a porous sleeve | Joseph DiStefano, Roger A. Haas, Fred Kelley | 1991-03-12 |