Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6357992 | Collapsible, powered platform for lifting wheelchair | Lynn O. Ringdahl | 2002-03-19 |
| 6053693 | Collapsible, powered platform for lifting wheelchair | Lynn O. Ringdahl | 2000-04-25 |
| 5672041 | Collapsible, powered platform for lifting wheelchair | Lynn O. Ringdahl, Jeffrey J. Stoen, Gary G. Gruber, Timothy W. Jenum | 1997-09-30 |