JF

John R. Frederick

📍 Washington, PA: #8 of 38 inventorsTop 25%
🗺 Pennsylvania: #948 of 4,234 inventorsTop 25%
Overall (1994): #114,485 of 165,921Top 70%
1
Patents 1994

Issued Patents 1994

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5308196 Yieldable confined core mine roof support — 1994-05-03