Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4994149 | Diluent substitution apparatus | David W. McDougall, Ronald G. Holcek | 1991-02-19 |
| 4882041 | Diluent substitution process | David W. McDougall, Ronald G. Holcek | 1989-11-21 |
| 4661242 | Diluent distillation process and apparatus | David W. McDougall, Robert E. Heigold | 1987-04-28 |