Ralf Kehl
6Patents
4h-index
4Co-inventors
46Inventor score
Filing activity: Sep 25, 1987 → Dec 12, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5632963A | Process for the removal of impurity elements from solutions of valuable metals | Emerging Cross-Sectional Technologies | 36 | Expired |
| US4834951A | Common separation of contaminating elements from electrolyte solutions of valuable metals | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5039496A | Process for selective extraction of contaminant elements from mixtures of electrolytes in solution | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5260039A | Process for the two-phase extraction of metal ions from phases containing solid metal oxides, agents and the use thereof | Emerging Cross-Sectional Technologies | 6 | Expired |
| US6045763A | Process for working up ammoniacal metal solutions including treating the wash water with an organic extraction solution | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4820417A | Use of citric acid partial esters for the extraction of iron | Emerging Cross-Sectional Technologies | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.