Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6001162 | Sulfur-treated asphalt compositions and their preparation | Roger E. Hayner | 1999-12-14 |
| 5728291 | Demetallation - high carbon conversion process, apparatus and asphalt products | Charles Benjamin Miller, Howard F. Moore, Robert H. Wombles, Carlton H. Jewitt, Roger E. Hayner +2 more | 1998-03-17 |
| 5601697 | Demetallation-High carbon conversion process, apparatus and asphalt products | Charles Benjamin Miller, Howard F. Moore, Robert H. Wombles, Carlton H. Jewitt, Roger E. Hayner +2 more | 1997-02-11 |