Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4675030 | Purification of helium | Bogdan A. Czarnecki | 1987-06-23 |
| 4639257 | Recovery of carbon dioxide from gas mixture | Melvyn Duckett | 1987-01-27 |
| 4496383 | Production of nitrogen from air | Colin Hubbard, Melvyn Duckett | 1985-01-29 |