Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5209715 | Automatic force generating and control system | Christopher W. Walker, Sung-Hak Kim, Howell Hsiao, Steven Frank | 1993-05-11 |
| D325610 | Physical exerciser | Christopher W. Walker, Howell Hsiao, Sung-Hak Kim | 1992-04-21 |
| 5058888 | Automatic force generating and control system | Christopher W. Walker, Sung-Hak Kim, Howell Hsiao, Steven Frank | 1991-10-22 |