DH

Dennis J. Helfritch

📍 Rapid City, SD: #3 of 17 inventorsTop 20%
🗺 South Dakota: #16 of 82 inventorsTop 20%
Overall (1997): #160,190 of 185,788Top 90%
1
Patents 1997

Issued Patents 1997

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5695616 Electron beam flue gas scrubbing treatment Ralph D. Genuario 1997-12-09