Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887464 | Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud | Trevor Burgess, Vassilios Kalessidis, Andre Orban, John R. Williams, Klaus J. Zanker | 1989-12-19 |