Robert H. Duffus

PI Ppg Industries: 1 patents #662 of 1,216Top 55%

📍 Butler, PA: #185 of 347 inventorsTop 55%

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

Overall (All Time): #4,085,662 of 4,157,543Top 100%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4256173	Two regenerator-flue system for regenerative furnaces	Yih-Wan Tsai	1981-03-17