DB

Donald F. Ball

CH Chemcut Holdings: 2 patents #7 of 23Top 35%
📍 State College, PA: #475 of 1,195 inventorsTop 40%
🗺 Pennsylvania: #30,495 of 74,527 inventorsTop 45%
Overall (All Time): #2,292,590 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5290384 Apparatus for controlled spray etching Karl F. G. Ketelhohn 1994-03-01
5228949 Method and apparatus for controlled spray etching Karl F. G. Ketelhohn 1993-07-20