Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871165 | Portable friction resistant exercise device | Howard B. Marshall, Gordon E. Kaye | 1989-10-03 |
| 4779866 | Portable friction resistant exercise device | Howard B. Marshall, Gordon E. Kaye | 1988-10-25 |
| 4343092 | Probe guide and holder | Robert O. Wahl, William D. Hay | 1982-08-10 |