Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4978172 | Gob methane drainage system | Jeffrey J. Schwoebel | 1990-12-18 |
| 4858689 | Coal gasification well drilling process | — | 1989-08-22 |
| D264983 | Exerciser | — | 1982-06-15 |
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4978172 | Gob methane drainage system | Jeffrey J. Schwoebel | 1990-12-18 |
| 4858689 | Coal gasification well drilling process | — | 1989-08-22 |
| D264983 | Exerciser | — | 1982-06-15 |