DH

Douglas E. Herum

📍 Estherville, IA: #9 of 22 inventorsTop 45%
🗺 Iowa: #8,735 of 15,303 inventorsTop 60%
Overall (All Time): #3,855,282 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5131796 Security fastener for threaded objects Roger A. Herum 1992-07-21