Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4967594 | Sheathing and venting of resistance-tape level sensor | John A. Gunnarson, William E. Pierce, Thomas C. Thorstensen | 1990-11-06 |
| 4942764 | Mounting head for a resistance-tape level sensor | Edwin P. Dews, William E. Pierce, John A. Gunnarson | 1990-07-24 |
| 4816799 | Resistive material level sensor | Michael D. Dabrowski | 1989-03-28 |