DH

David K. Helfenstein

📍 Benicia, CA: #156 of 234 inventorsTop 70%
🗺 California: #247,236 of 386,348 inventorsTop 65%
Overall (All Time): #3,352,556 of 4,157,543Top 85%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
7353777 Self-cleanable hair brush Michael Keith Morosin, Rose Chan Morosin 2008-04-08