DE

David A. Engstrom

📍 Warren, PA: #57 of 119 inventorsTop 50%
🗺 Pennsylvania: #43,221 of 74,527 inventorsTop 60%
Overall (All Time): #3,981,423 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4691428 Spanner for torsion springs and method for its use — 1987-09-08