Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9289337 | Wheelchair ramp for a ride vehicle | Joel L. Fritsche, William L. Wolf, Charles Albert Flueck | 2016-03-22 |
DH
Don Robert Hilsen
Overall (All Time): #2,991,517 of 4,157,543Top 75%
1
Patents All Time