Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5635653 | Ground water sampling device | Thomas M. Christy, Melvin P. Kejr | 1997-06-03 |
| 5612498 | Ground water sampling device | Thomas M. Christy, Melvin P. Kejr | 1997-03-18 |
| 5606139 | Soil sample probe with retaining ring for holding core-catching structure within the probe | Melvin P. Kejr, Thomas M. Christy | 1997-02-25 |
| 5553979 | Pull cap for attachment to a probe rod | Melvin P. Kejr | 1996-09-10 |