Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4728778 | Cooking apparatus | WongJung O. Choi | 1988-03-01 |
| 4610416 | Book holder | — | 1986-09-09 |
| 4496191 | Selective mining from horizontal holes | David L. McCain | 1985-01-29 |
| 4318302 | Method of determining mine roof stability | — | 1982-03-09 |
| 4278363 | Rock bolt and installation system | — | 1981-07-14 |
| 4265570 | Mine roof control | Hilmar A. von Schonfeldt | 1981-05-05 |