Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4454043 | Column switching procedure | David F. Tomkins, Melvin L. Rueppel | 1984-06-12 |
| 4227888 | Method for the quantitative determination of cyanide | Melvin L. Rueppel | 1980-10-14 |