DC

David A. Chatfield

NS National Steel: 2 patents #6 of 84Top 8%
📍 Dorpsstraat, PA: #210 of 560 inventorsTop 40%
🗺 Pennsylvania: #30,495 of 74,527 inventorsTop 45%
Overall (All Time): #2,363,939 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4407679 Method of producing high tensile aluminum-magnesium alloy sheet and the products so obtained Carmen C. Manzonelli 1983-10-04
4251294 Method for producing fully-processed low-carbon electrical steel Joseph F. Rzepka, Alan C. Preble 1981-02-17