Duval Corporation
17Patents
0Active
17Granted
32Portfolio score
Filing activity: May 27, 1975 → Jul 30, 1985
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4272341A | Process for recovery of metal values from lead-zinc ores, even those having a high carbonate content | Emerging Cross-Sectional Technologies | 26 | Expired |
| US4551213A | Recovery of gold | Chemistry; Metallurgy | 25 | Expired |
| US4025400A | Process and apparatus for the recovery of particulate crystalline product from an electrolysis system | Chemistry; Metallurgy | 16 | Expired |
| US4491279A | Portable rock crushing and conveying system | Performing Operations; Transporting | 15 | Expired |
| US4513859A | Conveyor with readily replaceable roller | Performing Operations; Transporting | 15 | Expired |
| US4342592A | Non-polluting process for recovery of precious metal values from ores including those containing carbonate materials | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4536214A | Metal sulphide extraction | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4517064A | Electrolytic cell | Chemistry; Metallurgy | 9 | Expired |
| US4147309A | Hydroset pressure relief system | Performing Operations; Transporting | 8 | Expired |
| US4544460A | Removal of potassium chloride as a complex salt in the hydrometallurgical production of copper | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4045335A | Beneficiation of kieserite and langbeinite from a langbeinite ore | Performing Operations; Transporting | 6 | Expired |
| US4518418A | Electron beam refinement of metals, particularly copper | Chemistry; Metallurgy | 6 | Expired |
| US4488902A | Horizontal, multistage electron beam refinement of metals with recycle | Chemistry; Metallurgy | 5 | Expired |
| US4634467A | Hydrometallurgical process for copper recovery | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4475771A | Cyclic solution mining of borate ores | Fixed Constructions | 4 | Expired |
| US3986943A | Hydrometallurgical process for the production of antimony | Chemistry; Metallurgy | 3 | Expired |
| US4545972A | Process for recovery of metal chloride and cuprous chloride complex salts | Emerging Cross-Sectional Technologies | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.