Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5105662 | Liquid level measurement system | Norman F. Marsh | 1992-04-21 |
| 4910878 | Suspended-cable apparatus for measuring level of material in a storage vessel | Phillip P. Fleckenstein, John T. Knepler | 1990-03-27 |