Inventor · Valence, FR

Pierre Dufresne

58Patents
12h-index
60Co-inventors
87Inventor score

Filing activity: Jun 23, 1983 → Apr 25, 2018

Most-cited inventions

PatentTitleAreaCited byStatus
US5401392A Process for eliminating mercury and possibly arsenic in hydrocarbons Chemistry; Metallurgy 37 Expired
US5803575A Light generator for introducing light into optical fibers Physics 35 Expired
US9434893B2 Process for the start-up of hydrotreatment or hydroconversion units Chemistry; Metallurgy 27 Active
US4738941A Hydrocracking catalyst for the production of middle distillates Chemistry; Metallurgy 27 Expired
US7713905B2 Off-site treatment for hydrogenation catalysts Chemistry; Metallurgy 25 Active
US5177280A Process for producing alkylbenzenes using a catalyst based on a dealuminized Y zeolite and a catalyst based on a dealuminized mordenite Emerging Cross-Sectional Technologies 21 Expired
US4738940A Novel hydrocracking or cracking catalyst for hydrocarbon charges Chemistry; Metallurgy 18 Expired
US5854162A Offsite regeneration process for a catalyst containing at least one precious metal Chemistry; Metallurgy 17 Expired
US6059956A Off-site pretreatment of a hydrocarbon treatment catalyst Performing Operations; Transporting 14 Expired
US4780436A Zeolite of omega structure catalysts Performing Operations; Transporting 14 Expired
US5397756A Process for the presulphurization of hydrocarbon treatment catalysts Performing Operations; Transporting 13 Expired
US5306860A Method of hydroisomerizing paraffins emanating from the Fischer-Tropsch process using catalysts based on H-Y zeolite Emerging Cross-Sectional Technologies 13 Expired
US4766099A Catalyst for oil hydrorefining or mild hydrocracking of heavy oil charges to produce middle distillates Performing Operations; Transporting 12 Expired
US4723048A Process for dismutation and transalkylation of aromatic hydrocarbons in the presence of a zeolite catalyst Chemistry; Metallurgy 12 Expired
US7582587B2 Passivation of sulphur hydroconversion catalyst Emerging Cross-Sectional Technologies 12 Expired
US4784750A Catalytic cracking process Performing Operations; Transporting 11 Expired
US6100216A Process for incorporating sulfur into the pores of a hydrocarbon treatment catalyst Chemistry; Metallurgy 11 Expired
US5345019A Method of hydrocracking paraffins emanating from the Fischer-Tropsch process using catalysts based on H-Y zeolite Emerging Cross-Sectional Technologies 11 Expired
US5592748A Heat treatment of solid catalyst or adsorbent particles in the presence of fluid in a vibrating helical coil Emerging Cross-Sectional Technologies 10 Expired
US4891200A Omega type zeolite having high thermal stability, its process of preparation and its utilization Emerging Cross-Sectional Technologies 10 Expired
US4501656A Dewaxing process employing a catalyst with a highly dealuminated mordenite base Chemistry; Metallurgy 10 Expired
US5922638A Process for presulfurizing hydrotreatment catalysts Performing Operations; Transporting 10 Expired
US6753291B2 Process for sulfiding an additive-containing catalyst Chemistry; Metallurgy 10 Expired
US5508243A Heat treatment of solid catalyst or adsorbent particles in the presence of fluid in a vibrating helical coil Emerging Cross-Sectional Technologies 8 Expired
US4645752A Hydrocracking catalyst and process for manufacturing the same Chemistry; Metallurgy 7 Expired

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