Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6212907 | Method for operating a cryogenic rectification column | John Fredric Billingham, Michael James Lockett | 2001-04-10 |
| 5921109 | Method for operating a cryogenic rectification column | John Billingham, Michael James Lockett | 1999-07-13 |