Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5237281 | Ion drag air flow meter | David B. Chang, Keith Pearson | 1993-08-17 |
| 4987582 | X-ray fluorescence imaging of elements | Keith Pearson, David B. Chang, Norton L. Moise, Victor Vali | 1991-01-22 |