Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887464 | Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud | Eli Tannenbaum, Trevor Burgess, Vassilios Kalessidis, Andre Orban, Klaus J. Zanker | 1989-12-19 |
| 4835304 | High density ester damping fluids | — | 1989-05-30 |