Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831160 | Removal of volatile acids from NMP solvent vapors with sacrificial metal and ion exchange | — | 1989-05-16 |
| 4490240 | Removal of corrodants from NMP solvent by contacting with sacrificial metal | Roy V. Comeaux, Douglas G. Ryan | 1984-12-25 |
| 4346008 | Rotary drum filter | Douglas G. Ryan | 1982-08-24 |
| 4208382 | Removing H.sub.2 S from gas with recycled NMP extraction solvent | John H. Blume, James D. Bushnell | 1980-06-17 |