DH

Douglas M. Harper

📍 Inver Grove Heights, MN: #190 of 287 inventorsTop 70%
🗺 Minnesota: #32,449 of 52,454 inventorsTop 65%
Overall (All Time): #3,995,318 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4587753 House signaling device — 1986-05-13