DD

Donn W. Duffey

RI Rockwell International: 1 patents #839 of 2,155Top 40%
📍 Pittsburgh, PA: #4,559 of 7,570 inventorsTop 65%
🗺 Pennsylvania: #43,221 of 74,527 inventorsTop 60%
Overall (All Time): #4,003,959 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4619283 Stem seal for tapered lubricated plug valves E. Frederick Schoeneweis 1986-10-28