Inventor
WITT DONALD R
17 patents
Patents
17 patentsUS4405501ASep 20, 1983
Aging of chromium-containing gel at high pH
PHILLIPS PETROLEUM CO110 citations96
US4392990AJul 12, 1983
Heating silica gel in inert atmosphere before activation
PHILLIPS PETROLEUM CO65 citations96
US4081407AMar 28, 1978
Catalyst support prepared by alcohol treatment of hydrogels
PHILLIPS PETROLEUM CO76 citations95
US5284811AFeb 8, 1994
Polymerization catalysts and processes
PHILLIPS PETROLEUM CO28 citations92
US4152503AMay 1, 1979
Catalyst support prepared by alcohol treatment of hydrogels
PHILLIPS PETROLEUM CO42 citations92
US3947433AMar 30, 1976
Supported chromium oxide catalyst having mixed adjuvant
PHILLIPS PETROLEUM CO45 citations92
US4436883AMar 13, 1984
Polymerization using a support formed by heating silica gel in inert atmosphere
PHILLIPS PETROLEUM CO24 citations82
US4246139AJan 20, 1981
Silica production
PHILLIPS PETROLEUM CO22 citations82
US4136061AJan 23, 1979
Continuous, multiple zone fluidized bed for particle treater
PHILLIPS PETROLEUM CO26 citations82
US3950316AApr 13, 1976
Catalyst support formed by adding acidic material to silica containing titanium
PHILLIPS PETROLEUM CO25 citations82
US5444132AAug 22, 1995
Controlled addition of alkali or alkaline earth salts to a chromium oxide catalyst
PHILLIPS PETROLEUM CO15 citations74
US5073531ADec 17, 1991
Olefin polymerization catalysts and preparation method
PHILLIPS PETROLEUM CO12 citations73
US4436882AMar 13, 1984
Polymerization process utilizing a catalyst prepared by aging of a chromium-containing gel at high pH
PHILLIPS PETROLEUM CO16 citations73
US4001196AJan 4, 1977
Reactivation of organochromium olefin polymerization catalyst in presence of oxygen
PHILLIPS PETROLEUM CO11 citations73
US3974101AAug 10, 1976
Olefin polymerization catalyst
PHILLIPS PETROLEUM CO16 citations73
US3948806AApr 6, 1976
Large pore silica and polymerization catalyst
PHILLIPS PETROLEUM CO9 citations73
US4009327AFeb 22, 1977
Polymerization of olefins
PHILLIPS PETROLEUM CO4 citations62