HL

Helen S. Leaver

AM Amax: 2 patents #35 of 180Top 20%
📍 Durango, CO: #63 of 211 inventorsTop 30%
🗺 Colorado: #17,029 of 40,980 inventorsTop 45%
Overall (All Time): #2,348,983 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4600435 Solvent extraction of cobalt (II) from sulfate solutions with cobalt extractants Ben W. Wiegers, Eddie C. Chou, John D. Bruno 1986-07-15
4221765 Purification of nickel chloride solutions Gustavo A. Meyer, Mark Allen Peters 1980-09-09