Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| H651 | Gas phase photoacoustic detector for infrared spectroscopy | Dennis M. Davis, Lynn D. Hoffland | 1989-07-04 |
| 4839516 | Method for quantitative analysis of core samples | David L. Freeman, Donald G. Harville | 1989-06-13 |