Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4364740 | Method for removing undesired components from coal | Lester G. Massey, William A. Abel | 1982-12-21 |
| 4362181 | Pressure relief system | Lester G. Massey, David A. George, William A. Abel | 1982-12-07 |
| 4313737 | Method for separating undesired components from coal by an explosion type comminution process | Lester G. Massey, William A. Abel | 1982-02-02 |