David Krofchak

FM Fenicem Minerals: 1 patents #1 of 1Top 100%

📍 Markham, CA: #4 of 69 inventorsTop 6%

Overall (1997): #42,976 of 185,788Top 25%

Patents 1997

Issued Patents 1997

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
5626646	Method of recovering metals and producing a secondary slag from base metal smelter slag	—	1997-05-06
5593493	Method of making concrete from base metal smelter slag	—	1997-01-14