John E. Duddy
12Patents
5h-index
8Co-inventors
59Inventor score
Filing activity: May 9, 1997 → Feb 5, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7938952B2 | Process for multistage residue hydroconversion integrated with straight-run and conversion gasoils hydroconversion steps | Chemistry; Metallurgy | 61 | Active |
| US5925238A | Catalytic multi-stage hydrodesulfurization of metals-containing petroleum residua with cascading of rejuvenated catalyst | Chemistry; Metallurgy | 40 | Expired |
| US7704377B2 | Process and installation for conversion of heavy petroleum fractions in a boiling bed with integrated production of middle distillates with a very low sulfur content | Chemistry; Metallurgy | 38 | Active |
| US10800982B2 | Processing scheme for production of low sulfur bunker fuel | Chemistry; Metallurgy | 9 | Active |
| US5906953A | Catalyst rejuvenation process | Performing Operations; Transporting | 5 | Expired |
| US7938953B2 | Selective heavy gas oil recycle for optimal integration of heavy oil conversion and vacuum gas oil treating | Chemistry; Metallurgy | 3 | Active |
| US8226821B2 | Direct coal liquefaction with integrated product hydrotreating and catalyst cascading | Chemistry; Metallurgy | 3 | Active |
| US10487274B2 | Integrated coal liquefaction, petroleum or biomass facility with decreased carbon dioxide production and higher carbon and thermal efficiencies | Emerging Cross-Sectional Technologies | 3 | Active |
| US7919054B2 | Process and installation for conversion of heavy petroleum fractions in a boiling bed with integrated production of middle distillates with a very low sulfur content | Chemistry; Metallurgy | 2 | Active |
| US8252169B2 | Process for upgrading coal pyrolysis oils | Chemistry; Metallurgy | 1 | Active |
| US10400108B2 | Carbon black feedstock from direct coal liquefaction | Chemistry; Metallurgy | 0 | Active |
| US10351712B2 | Carbon black feedstock from direct coal liquefaction | General | 0 | Revoked |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.