John E. Shoff

NR North American Refractories: 1 patents #20 of 40Top 50%

📍 Clearfield, PA: #24 of 61 inventorsTop 40%

🗺 Pennsylvania: #43,221 of 74,527 inventorsTop 60%

Overall (All Time): #3,787,243 of 4,157,543Top 95%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
5478053	Refractory gas purging device	Tomas Richter, John Skok	1995-12-26