Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4360420 | Distillation and solvent extraction process for rerefining used lubricating oil | Harold J. Beard, Richard H. O'Blasny | 1982-11-23 |
| 4342645 | Method of rerefining used lubricating oil | Harold J. Beard | 1982-08-03 |