Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871382 | Air separation process using packed columns for oxygen and argon recovery | Robert M. Thorogood, Rodney John Allam, Alan L. Prentice, Bruce K. Dawson | 1989-10-03 |
| 4836836 | Separating argon/oxygen mixtures using a structured packing | Keith A. Ludwig, George S. Witmer, Charles M. Woods | 1989-06-06 |
| 4813988 | Suitable distillation column packing for the cryogenic separation of air | Keith A. Ludwig, Andrew J. Patrylak, John S. Zabrenski | 1989-03-21 |