DH

Douglas S. Hart

📍 Kenai, AK: #7 of 28 inventorsTop 25%
🗺 Alaska: #188 of 1,355 inventorsTop 15%
Overall (All Time): #1,657,500 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
5259692 Ground breaking apparatus Larry D. Beller, Robert L. White 1993-11-09
5203274 Amphibious vehicle Larry D. Beller, Robert L. White 1993-04-20
5203729 Auger-driven amphibious toy Larry D. Beller, Robert L. White 1993-04-20