Peter S. Maa
21Patents
11h-index
28Co-inventors
75Inventor score
Filing activity: Nov 26, 1975 → May 23, 2016
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5055181A | Hydropyrolysis-gasification of carbonaceous material | Chemistry; Metallurgy | 56 | Expired |
| US5338441A | Liquefaction process | Chemistry; Metallurgy | 46 | Expired |
| US4485008A | Liquefaction process | Chemistry; Metallurgy | 37 | Expired |
| US4831003A | Catalyst composition and process of making | Performing Operations; Transporting | 26 | Expired |
| US4189371A | Multiple-stage hydrogen-donor coal liquefaction process | Chemistry; Metallurgy | 23 | Expired |
| US5795464A | Conversion of the organic component from tar sands to lower boiling products | Chemistry; Metallurgy | 22 | Expired |
| US4113602A | Integrated process for the production of hydrocarbons from coal or the like in which fines from gasifier are coked with heavy hydrocarbon oil | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4123347A | Coal liquefaction process | Chemistry; Metallurgy | 16 | Expired |
| US4092235A | Treatment of coal by alkylation or acylation to increase liquid products from coal liquefaction | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4022680A | Hydrogen donor solvent coal liquefaction process | Chemistry; Metallurgy | 15 | Expired |
| US4338182A | Multiple-stage hydrogen-donor coal liquefaction | Chemistry; Metallurgy | 14 | Expired |
| US5096569A | Catalytic hydropyrolysis of carbonaceous material with char recycle | Chemistry; Metallurgy | 9 | Expired |
| US5294349A | Coal depolymerization and hydroprocessing | Performing Operations; Transporting | 8 | Expired |
| US4338184A | Coal conversion in the presence of added alkali metal compounds | Chemistry; Metallurgy | 6 | Expired |
| US4322283A | Coal conversion in the presence of added hydrogen sulfide | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4313816A | Staged temperature coal conversion process | Chemistry; Metallurgy | 6 | Expired |
| US4283267A | Staged temperature hydrogen-donor coal liquefaction process | Chemistry; Metallurgy | 5 | Expired |
| US4824558A | Coal liquefaction process with metal/iodine cocatalyst | Chemistry; Metallurgy | 4 | Expired |
| US7419585B2 | Process for upgrading residua | Chemistry; Metallurgy | 2 | Expired |
| US9994778B2 | Direct coal liquefaction process and system | Chemistry; Metallurgy | 0 | Active |
| US7160437B2 | Method for determining the source of fouling in thermal conversion process units | Emerging Cross-Sectional Technologies | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.