DE

David Erfer

📍 Broomall, PA: #86 of 152 inventorsTop 60%
🗺 Pennsylvania: #43,221 of 74,527 inventorsTop 60%
Overall (All Time): #4,118,030 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4218154 Writing instrument with self-closure — 1980-08-19