Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5921047 | Building structure having prefabricated interfitting structural parts | — | 1999-07-13 |
| 5291904 | Dorsiflexion assisting device for hemiplegics | — | 1994-03-08 |
| 4771583 | Space divider system | Douglas C. Ball, William S. Stumpf, Gary R. Ludwig | 1988-09-20 |
| 4224769 | Space divider system | Douglas C. Ball | 1980-09-30 |