Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5321953 | Cryogenic rectification system with prepurifier feed chiller | — | 1994-06-21 |
| 5228297 | Cryogenic rectification system with dual heat pump | Theodore F. Fisher | 1993-07-20 |
| 4666481 | Process for producing liquid helium | — | 1987-05-19 |