Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852384 | Automatic calibration and control system for a combined oxygen and combustibles analyzer | Gordon D. Woolbert, John W. Robertson | 1989-08-01 |
| 4846410 | Apparatus for monitoring low-level combustibles | John W. Robertson, Gordon D. Woolbert | 1989-07-11 |