Patents Represented by Attorney W. L. Stumpf

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  • One-step stabilizing and dewaxing of lube oils
    Patent number: 4561967
    Abstract: A one-step dewaxing and stabilizing process for hydrocracked lube oils is disclosed wherein said process employs an intermediate pore size zeolite having a high silica-alumina ratio and being free of hydrogenation components and said process being operated at pressures of less than 13 bar.
    Type: Grant
    Filed: December 15, 1983
    Date of Patent: December 31, 1985
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Low activity catalyst oligomerization process
    Patent number: 4511746
    Abstract: A process for the pure oligomerization of C.sub.2 -C.sub.6 alkenes over low hydrogen transfer activity molecular sieves is disclosed.
    Type: Grant
    Filed: September 25, 1981
    Date of Patent: April 16, 1985
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Zeolite SSZ-16
    Patent number: 4508837
    Abstract: A crystalline zeolite, SSZ-16, is prepared from organic nitrogen-containing species derived from 1,4-di(1-azoniabicyclo[2.2.2]octane) lower alkane compounds.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: April 2, 1985
    Assignee: Chevron Research Company
    Inventor: Stacey I. Zones
  • Process for preparing olefins at high pressure
    Patent number: 4502945
    Abstract: A highly efficient process for producing olefins using intermediate pore size zeolites is disclosed. The use of a specific range of silica:alumina mole ratios (175:1 to about 300:1) at pressure over 30 psia has been found to decrease catalyst deactivation rates for these intermediate pore size catalysts.
    Type: Grant
    Filed: June 9, 1982
    Date of Patent: March 5, 1985
    Assignee: Chevron Research Company
    Inventors: Hazel C. Olbrich, Dennis J. O'Rear
  • Low pressure oligomerization of gaseous olefins
    Patent number: 4423268
    Abstract: A process for oligomerizing normally gaseous olefins over essentially alumina free molecular sieves at low pressures is disclosed.
    Type: Grant
    Filed: January 8, 1982
    Date of Patent: December 27, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Oligomerization of gaseous olefins
    Patent number: 4423269
    Abstract: A process for oligomerizing gaseous olefins using intermediate pore size molecular sieves is disclosed.
    Type: Grant
    Filed: September 25, 1981
    Date of Patent: December 27, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Hydrocarbon conversion with crystalline silicates
    Patent number: 4416766
    Abstract: A process for selectively converting adsorbable hydrocarbon feeds containing straight-chain and slightly branched-chain hydrocarbons to olefins by contacting the feeds with crystalline silicates.
    Type: Grant
    Filed: October 22, 1981
    Date of Patent: November 22, 1983
    Assignee: Chevron Research Company
    Inventor: Bernard F. Mulaskey
  • Fluidized oligomerization
    Patent number: 4417087
    Abstract: A fluidized oligomerization process is disclosed.
    Type: Grant
    Filed: April 30, 1982
    Date of Patent: November 22, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Oligomerization of liquid olefins
    Patent number: 4417088
    Abstract: A new process for oligomerizing liquid olefins using intermediate pore size molecular sieves is disclosed.
    Type: Grant
    Filed: September 25, 1981
    Date of Patent: November 22, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Efficient fluidized oligomerization
    Patent number: 4417086
    Abstract: A highly efficient oligomerization process using molecular sieves is disclosed.
    Type: Grant
    Filed: April 30, 1982
    Date of Patent: November 22, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Multistep oligomerization process
    Patent number: 4414423
    Abstract: A multistep process for preparing high-boiling hydrocarbons from normally gaseous hydrocarbons is disclosed.
    Type: Grant
    Filed: September 25, 1981
    Date of Patent: November 8, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Hydrocarbon conversion with low-sodium crystalline silicates
    Patent number: 4401555
    Abstract: Hydrocarbon conversion in the presence of a low-sodium form crystalline silicate converts normal and slightly branched paraffins, at least in part, to olefins.
    Type: Grant
    Filed: October 22, 1981
    Date of Patent: August 30, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Hydrocarbon conversion with crystalline silicate particle having an aluminum-containing outer shell
    Patent number: 4394251
    Abstract: Hydrocarbon conversion processes with crystalline silicates surrounded by an alumina containing isostructural shell are claimed.
    Type: Grant
    Filed: April 28, 1981
    Date of Patent: July 19, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Crystalline silicate particle having an aluminum-containing outer shell
    Patent number: 4394362
    Abstract: Crystalline silicate particles having an aluminum-containing isostructural outer shell. The particles are prepared by first crystallizing crystalline silicate particles from a first reaction medium and thereafter crystallizing an isostructural outer shell onto said crystalline silicate particles from a reaction medium containing an increased source of aluminum.
    Type: Grant
    Filed: April 28, 1981
    Date of Patent: July 19, 1983
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Hydrocarbon upgrading process
    Patent number: 4390413
    Abstract: A petroleum distillate feed is upgraded and an olefinic product is produced by contacting the feed with ZSM-5-type zeolite at (1) a temperature in the 500.degree. F.-800.degree. F. range; (2) a pressure below about 13 atmospheres gauge; and (3) an LHSV in the 0.1-15 V/V/Hr range.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: June 28, 1983
    Assignee: Chevron Research Company
    Inventors: Dennis J. O'Rear, Jerome F. Mayer
  • Stabilizing and dewaxing lube oils
    Patent number: 4361477
    Abstract: A two-step process for dewaxing and stabilizing hydrocracked lubricating oil stocks is disclosed. High-silica zeolite produces catalytic dewaxer effluent containing lower olefins for favorable stabilizing (alkylation) reactions by contact with acidic catalyst substantially free of hydrogenation activity.
    Type: Grant
    Filed: April 17, 1981
    Date of Patent: November 30, 1982
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Catalytic dewaxing
    Patent number: 4360419
    Abstract: An improved catalytic dewaxing process using a CZH-5 zeolite having a hydrogenation component is disclosed.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: November 23, 1982
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller
  • Benzene synthesis
    Patent number: 4347394
    Abstract: A process for selectively producing benzene using intermediate pore size zeolites substantially free of acidity is disclosed.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: August 31, 1982
    Assignee: Chevron Research Company
    Inventors: Clifford M. Detz, Leslie A. Field
  • Production of lubricating oils
    Patent number: 4347121
    Abstract: A process is provided for preparing stable lubricant oil stocks, comprising hydrocracking a hydrocarbonaceous feed to produce a hydrocrackate having a total nitrogen content of less than about 10 ppm by weight, followed by dewaxing and stabilizing the hydrocrackate.
    Type: Grant
    Filed: October 9, 1980
    Date of Patent: August 31, 1982
    Assignee: Chevron Research Company
    Inventors: Jerome F. Mayer, Stephen J. Miller, Dennis J. O'Rear
  • Cyclic process for upgrading a hydrocarbon or hydrocarbon-forming feed using a ZSM-5 zeolite
    Patent number: 4330396
    Abstract: In a cyclic process for upgrading a hydrocarbon or hydrocarbon-forming feed by steps including regenerating of the zeolite catalyst, the operating period or cycle is substantially increased by using a ZSM-5 zeolite having a silica-to-alumina mol ratio in the range 61 to 140.
    Type: Grant
    Filed: October 18, 1978
    Date of Patent: May 18, 1982
    Assignee: Chevron Research Company
    Inventor: Stephen J. Miller