Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7223080 | Double-acting, high pressure cryogenic pump | — | 2007-05-29 |
| 4487256 | Cryogenic heat exchanger | Robert D. Lutjens | 1984-12-11 |
| 4376377 | Unloading system for cryogenic pumps | Charles E. Tellez, Robert D. Lutjens | 1983-03-15 |