Inventor · Irvine, CA, US

Howard D. Simpson

42Patents
17h-index
17Co-inventors
78Inventor score

Filing activity: Dec 17, 1976 → Jul 28, 1997

Most-cited inventions

PatentTitleAreaCited byStatus
US4460707A Hydroprocessing catalyst and method for preparing it Chemistry; Metallurgy 90 Expired
US5389595A Hydroprocessing catalyst, its use, and method of preparation Performing Operations; Transporting 54 Expired
US5300217A Hydroprocess utilizing a delta alumina-supported nickel and molybdenum catalyst Performing Operations; Transporting 50 Expired
US4548710A Hydrocarbon processing Chemistry; Metallurgy 46 Expired
US5686375A Hydroprocessing catalyst and its use Performing Operations; Transporting 45 Expired
US5334307A Resid hydroprocessing catalyst Performing Operations; Transporting 39 Expired
US4255282A Hydrotreating catalyst and process for its preparation Chemistry; Metallurgy 33 Expired
US4500424A Desulfurization catalyst and process Performing Operations; Transporting 28 Expired
US4431526A Multiple-stage hydroprocessing of hydrocarbon oil Chemistry; Metallurgy 25 Expired
US4394302A Hydrodesulfurization catalyst on lithium-containing support and method for its preparation Chemistry; Metallurgy 24 Expired
US5906731A Process for hydroprocessing hydrocarbons Chemistry; Metallurgy 24 Expired
US4846961A Hydroprocessing catalyst with a Ni-P-Mo Chemistry; Metallurgy 24 Expired
US4818743A Desulfurization catalyst and the catalyst prepared by a method Performing Operations; Transporting 23 Expired
US4568449A Hydrotreating catalyst and process Chemistry; Metallurgy 22 Expired
US4879265A Hydroprocessing catalyst and phosphorous and citric acid containing impregnating solution Chemistry; Metallurgy 20 Expired
US4738944A Ni-P-Mo catalyst and hydroprocessing use thereof Performing Operations; Transporting 20 Expired
US5223472A Demetallation catalyst Performing Operations; Transporting 17 Expired
US4284531A Methanation catalysts and process for their preparation Chemistry; Metallurgy 17 Expired
US4513097A Hydrotreating catalyst and a method for preparing the catalyst Chemistry; Metallurgy 17 Expired
US5403806A Phosphorous-containing hydroprocessing catalyst and method of preparation Performing Operations; Transporting 17 Expired
US4568450A Hydrocarbon conversion process Chemistry; Metallurgy 16 Expired
US4455390A Catalyst and method for impregnating at a pH less than one Chemistry; Metallurgy 15 Expired
US4969990A Hydroprocessing with a catalyst having a narrow pore size distribution Performing Operations; Transporting 14 Expired
US5494568A Hydrocarbon conversion process Performing Operations; Transporting 14 Expired
US4886582A Resid hydroprocessing catalyst and method of preparation Performing Operations; Transporting 13 Expired

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.