William T. Rule

TM The Hanna Mining: 2 patents #2 of 10Top 20%

📍 Hibbing, MN: #20 of 73 inventorsTop 30%

🗺 Minnesota: #23,881 of 52,454 inventorsTop 50%

Overall (All Time): #2,366,139 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4324654	Recovery of copper from copper oxide minerals	—	1982-04-13
4214983	Recovery of copper from copper oxide minerals	—	1980-07-29