John A. Karch
21Patents
10h-index
12Co-inventors
72Inventor score
Filing activity: Jun 14, 1976 → Jun 10, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4790982A | Metal-containing spinel composition and process of using same | Emerging Cross-Sectional Technologies | 61 | Expired |
| US4963520A | Metal-containing spinel composition and process of using same | Emerging Cross-Sectional Technologies | 55 | Expired |
| US4957718A | Process for reducing emissions of sulfur oxides and composition useful in same | Performing Operations; Transporting | 44 | Expired |
| US4522937A | Preparative process for alkaline earth metal, aluminum-containing spinels | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4158548A | Process for removing sulfur from coal | Chemistry; Metallurgy | 19 | Expired |
| US4101444A | Catalyst demetallization utilizing a combination of reductive and oxidative washes | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4163709A | Catalyst demetallization by oxidation in a defined temperature range | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4243550A | Catalyst demetallization with a reductive SO.sub.2 wash | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4097244A | Process for removing sulfur from coal | Chemistry; Metallurgy | 12 | Expired |
| US4317713A | In situ aluminum passivation process | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4163710A | Cracking process employing a combination of reductive and oxidative washes | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4224038A | Process for removing sulfur from coal | Chemistry; Metallurgy | 9 | Expired |
| US4267032A | Demetallization process for a conversion catalyst | Chemistry; Metallurgy | 7 | Expired |
| US4234452A | High pressure oxygen aqueous phase catalyst demetallization | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4102811A | Catalyst demetallization by oxidation in a defined temperature range | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4105416A | Process for removing sulfur from coal | Chemistry; Metallurgy | 7 | Expired |
| US4197090A | Process for removing sulfur from coal | Chemistry; Metallurgy | 4 | Expired |
| US7309679B2 | Attrition resistant MTO catalyst | Chemistry; Metallurgy | 4 | Expired |
| US4293403A | Catalyst demetallization by converting the metal poisons to a sulfur containing metal compound having a defined low amount of sulfur | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4204840A | Process for removing sulfur from coal | Chemistry; Metallurgy | 2 | Expired |
| US12102986B2 | Catalyst for propane dehydrogenation to propylene | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.