Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4967594 | Sheathing and venting of resistance-tape level sensor | Albert D. Ehrenfried, William E. Pierce, Thomas C. Thorstensen | 1990-11-06 |
| 4942764 | Mounting head for a resistance-tape level sensor | Edwin P. Dews, William E. Pierce, Albert D. Ehrenfried | 1990-07-24 |