DH

David H. Hanssen

FI Frommelt Industries: 1 patents #6 of 8Top 75%
📍 Dubuque, IA: #358 of 571 inventorsTop 65%
🗺 Iowa: #8,735 of 15,303 inventorsTop 60%
Overall (All Time): #3,977,333 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4676293 Impact-resistant overhead door — 1987-06-30