John E. Hofmann
13Patents
11h-index
13Co-inventors
69Inventor score
Filing activity: Dec 22, 1970 → Aug 20, 1999
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5976475A | Reducing NO.sub.x emissions from an engine by temperature-controlled urea injection for selective catalytic reduction | Emerging Cross-Sectional Technologies | 119 | Expired |
| US6361754B1 | Reducing no emissions from an engine by on-demand generation of ammonia for selective catalytic reduction | Emerging Cross-Sectional Technologies | 74 | Expired |
| US6203770A | Urea pyrolysis chamber and process for reducing lean-burn engine NOx emissions by selective catalytic reduction | Emerging Cross-Sectional Technologies | 72 | Expired |
| US5968464A | Urea pyrolysis chamber and process for reducing lean-burn engine NO.sub.x emissions by selective catalytic reduction | Emerging Cross-Sectional Technologies | 71 | Expired |
| US4978514A | Combined catalytic/non-catalytic process for nitrogen oxides reduction | Performing Operations; Transporting | 32 | Expired |
| US5543123A | Low pressure formation of a urea hydrolysate for nitrogen oxides reduction | Performing Operations; Transporting | 30 | Expired |
| US5048432A | Process and apparatus for the thermal decomposition of nitrous oxide | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US5139754A | Catalytic/non-catalytic combination process for nitrogen oxides reduction | Performing Operations; Transporting | 27 | Expired |
| US5286467A | Highly efficient hybrid process for nitrogen oxides reduction | Performing Operations; Transporting | 26 | Expired |
| US5658547A | Simplified efficient process for reducing NO.sub.x, SO.sub.x, and particulates | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4997631A | Process for reducing nitrogen oxides without generating nitrous oxide | Emerging Cross-Sectional Technologies | 20 | Expired |
| US5229090A | Process for nitrogen oxides reduction to lowest achievable level | Performing Operations; Transporting | 4 | Expired |
| US3936490A | Process for conducting organonitrile addition reactions | Chemistry; Metallurgy | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.