Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5880480 | Optical liquid level sensor including built-in test circuitry | Sylvester M. Ellinger, Jerre G. Longfellow, Robert Downing LaClair | 1999-03-09 |
| 5761955 | Removable ultrasonic transducer with integral electrical disconnect | Frederick L. Lichtenfels, II | 1998-06-09 |
| 5669262 | Removable ultrasonic transducer with integral electrical disconnect | Frederick L. Lichtenfels, II | 1997-09-23 |