Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889324 | Exothermic welding apparatus and method | James E. Whetsel, Richard E. Singer, Mark V. Samas, Michael D. Amos, David P. Kovarik | 1989-12-26 |
| 4881677 | Exothermic welding apparatus including a baffle cover assembly | Michael D. Amos, Mark V. Samas, Richard E. Singer, James E. Whetsel, David P. Kovarik | 1989-11-21 |