David R. Parrish
17Patents
7h-index
8Co-inventors
55Inventor score
Filing activity: Dec 9, 1970 → Nov 27, 1985
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4344486A | Method for enhanced oil recovery | Mechanical Engineering; Lighting; Heating | 162 | Expired |
| US4055399A | Tracers in predetermined concentration ratios | Fixed Constructions | 30 | Expired |
| US3947473A | Antioxidant chroman compounds | Chemistry; Metallurgy | 24 | Expired |
| US4026907A | Antioxidant chroman compounds | Chemistry; Metallurgy | 18 | Expired |
| US4003919A | Antioxidant chroman compounds | Chemistry; Metallurgy | 16 | Expired |
| US4018799A | Antioxidant chroman compounds | Chemistry; Metallurgy | 12 | Expired |
| US4431055A | Method for selective plugging of depleted channels or zones in in situ oil shale retorts | Fixed Constructions | 7 | Expired |
| US4150031A | Hydroxy methyl carbazole acetic acid and esters | Chemistry; Metallurgy | 2 | Expired |
| US4105696A | Asymmetric synthesis of organic compounds | Chemistry; Metallurgy | 2 | Expired |
| US4648450A | Method of producing synthesis gas by underground gasification of coal using specific well configuration | Emerging Cross-Sectional Technologies | 2 | Expired |
| US3975442A | 2-Alkyl-2-(3-oxoalkyl)-1,3-cyclopentadiones | Chemistry; Metallurgy | 2 | Expired |
| US4178289A | Carbazole acetic acid derivatives | Chemistry; Metallurgy | 1 | Expired |
| US3975440A | Asymmetric synthesis of organic compounds | Chemistry; Metallurgy | 1 | Expired |
| US4189447A | Substituted-hydroxytetrahydroindanones | Chemistry; Metallurgy | 0 | Expired |
| US4108898A | Asymmetric synthesis of organic compounds | Chemistry; Metallurgy | 0 | Expired |
| US4110380A | Asymmetric synthesis of organic compounds | Chemistry; Metallurgy | 0 | Expired |
| US4102929A | Asymmetric synthesis of organic compounds | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.