Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12013435 | Calibration system and method | Timothy S. Meyers, Daniel Gruber, Kenneth J. Swidwa | 2024-06-18 |
| 4900897 | Sheathed electric heating element assembly | Donald M. Cunningham, T. Randall Markum | 1990-02-13 |
| 4687905 | Electric immersion heating element assembly for use with a plastic water heater tank | Donald M. Cunningham, T. Randall Markum | 1987-08-18 |