DH

David L. Helman

UN Unknown: 1 patents #29,356 of 83,584Top 40%
📍 Riverdale, MI: #2 of 6 inventorsTop 35%
🗺 Michigan: #49,615 of 86,293 inventorsTop 60%
Overall (All Time): #3,786,752 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5476241 Wheelchair accessory stand — 1995-12-19