Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6993445 | Vortex flowmeter | David W. Clarke | 2006-01-31 |
| 6915242 | Evaluating a vortex flow-meter signal | David W. Clarke | 2005-07-05 |
| 6832179 | Evaluating a vortex flow-meter signal | David W. Clarke | 2004-12-14 |