John Campbell
12Patents
2h-index
12Co-inventors
51Inventor score
Filing activity: Jun 4, 1993 → Dec 24, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5433855A | Process for extracting metal values from aqueous solution | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5393431A | Process for extracting metals | Emerging Cross-Sectional Technologies | 2 | Expired |
| US9989664B2 | Process for mining alluvial deposits | Physics | 1 | Active |
| US5728853A | Chemical process | Emerging Cross-Sectional Technologies | 1 | Expired |
| US8609063B2 | Metal extractant reagents having increased resistance to degradation | Emerging Cross-Sectional Technologies | 0 | Active |
| US5557003A | Alkylphenoxy substituted bis (thio phosphoryl) amines | Emerging Cross-Sectional Technologies | 0 | Expired |
| US8088810B2 | Phenoxypyrazole composition and process for the solvent extraction of metals | Emerging Cross-Sectional Technologies | 0 | Active |
| US8349208B2 | Modification of copper/iron selectivity in copper solvent extraction systems | Emerging Cross-Sectional Technologies | 0 | Active |
| US8282857B2 | Modification of copper/iron selectivity in copper solvent extraction systems | Emerging Cross-Sectional Technologies | 0 | Active |
| US5502250A | Bis(dialkylthiophosphoryl)amines as metal extractants | Emerging Cross-Sectional Technologies | 0 | Expired |
| US8329124B2 | Metal extractant reagents having increased resistance to degradation | Emerging Cross-Sectional Technologies | 0 | Active |
| US8470052B2 | Phenoxypyrazole composition and process for the solvent extraction of metals | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.