Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6998754 | Brush assemblies | Pimol Vonkchalee, Shepard Hockaday, Alvin Farthing, Otway Southall | 2006-02-14 |
| 6246144 | Carbon brush holders or cards | Shepard Hockaday, Beecher G. Simmons, Scott L. Fitzner | 2001-06-12 |