Patents Represented by Attorney Penny L. Prater
  • Patent number: 8268187
    Abstract: The present invention is directed to a refrigerator oil composition comprising (a) at least one diester species having the following structure: wherein R1, R2, R3, and R4 are the same or independently selected from hydrocarbon groups having from 2 to 17 carbon atoms; and (b) a refrigerant.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: September 18, 2012
    Assignee: Chevron U.S.A. Inc.
    Inventors: David C. Krammer, Ravindra Shah, Stephen J. Miller, Saleh Elomari
  • Patent number: 8188019
    Abstract: The present invention is generally directed to triester-based lubricant compositions. The present invention is also directed to methods of making these and other similar lubricant compositions. In some embodiments, the methods for making such triester-based lubricants utilize a biomass precursor comprising mono-unsaturated fatty acids, wherein such mono-unsaturated fatty acids are reduced to mono-unsaturated fatty alcohols en route to the synthesis of triester species for use as/in the triester-based lubricant compositions. Subsequent steps in such synthesis may employ carboxylic acids and/or acyl halides/anhydrides derived from biomass and/or Fischer-Tropsch synthesis.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: May 29, 2012
    Assignee: Chevron U.S.A. Inc
    Inventors: Saleh A. Elomari, Stephen Joseph Miller, Zhen Zhou
  • Patent number: 8062545
    Abstract: An antifreeze composition having improved thermal stability is provided. In one embodiment, the antifreeze concentrate composition comprises from 50 to 99.8 wt. % of a glycol-based freezing point depressant selected from the group of: alkylene glycols, glycol monoethers, glycerins, and mixtures thereof; 0.01 to 10 wt. % of at least one of a 2-ethylhexanoic acid, isononanoic acid and 3,5,5-trimethylhexanoic acid; and 0.01 to 5 wt. % of at least one of octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, neodecanoic acid, benzoic acid, 2-hydroxybenzoic acid, p-terbutylbenzoic acid, and mixtures thereof. In one embodiment, the composition is employed as a concentrate in admixture with 10 to 90 wt. % water. In one embodiment no more than one dicarboxylic acid is used as an additive. In another embodiment no dicarboxylic acid is present.
    Type: Grant
    Filed: August 9, 2010
    Date of Patent: November 22, 2011
    Assignee: Chevron U.S.A Inc.
    Inventors: Serge S. Lievens, Jurgen P. DeKimpe
  • Patent number: 8062546
    Abstract: A molybdate-free antifreeze composition having improved thermal stability is provided. In one embodiment, the antifreeze concentrate composition comprises from 50 to 99 wt. % of a glycol-based freezing point depressant selected from the group of: alkylene glycols, glycol monoethers, glycerins, and mixtures thereof; 0.01 to 10 wt. % of at least one of a 2-ethylhexanoic acid, isononanoic acid and 3,5,5-trimethylhexanoic acid; and 0.01 to 5 wt. % of at least one of heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, neodecanoic acid, 2-hydroxybenzoic acid, p-terbutylbenzoic acid, and mixtures thereof. In one embodiment, the composition is employed as a concentrate in admixture with 10 to 90 wt. % water.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: November 22, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Serge S. Lievens, Jurgen P. DeKimpe
  • Patent number: 8057695
    Abstract: A toxicological friendly antifreeze composition having improved thermal stability is provided. In one embodiment, the antifreeze composition comprises from 5 to 80 wt. % of an aqueous freezing point depressant selected from alkali metal salts of acetates, formates, proprionates, adipiates, and succinates, and mixtures thereof; 0.1 to 10 wt. % of at least one of a 2-ethylhexanoic acid, isononanoic acid and 3,5,5-trimethylhexanoic acid; and 0.1 to 10 wt. % of at least one of octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, neodecanoic acid, benzoic acid, 2-hydroxybenzoic acid, p-terbutylbenzoic acid, and mixtures thereof. In one embodiment, the composition is employed as a concentrate in admixture with 10 to 90 wt. % water. The composition may be totally free of glycol, or, in an alternate embodiment, possess a glycol:non-glycol base ratio of 1:2 to 1:20.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: November 15, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Serge S. Lievens, Jurgen P. De Kimpe
  • Patent number: 7932217
    Abstract: A gear oil composition is provided. The composition comprises a synergistic amount of an isomerized base oil having consecutive numbers of carbon atoms and less than 10 wt % naphthenic carbon by n-d-M for the gear oil composition to have a traction coefficient at 15 mm2/s. of less than 0.030 and a pressure viscosity coefficient of at least 15.0 at 80° C., 20 Newton load, and 1.1 m/s rolling speed. In one embodiment, the sufficient amount of isomerized base oil ranges from 20 to 80 wt. % based on the total weight of the gear oil composition.
    Type: Grant
    Filed: June 4, 2008
    Date of Patent: April 26, 2011
    Assignee: Chevron U.S.A., Inc.
    Inventors: Allan G. Hee, Trevor Miller
  • Patent number: 7919440
    Abstract: A lubricating composition with improved storage stability comprising a major amount of an oil of lubricating viscosity, at least one alkali metal borate, at least one polysulfide mixture having at least 40% dihydrocarbyl tetrasulfide or higher sulfides, and at least one non-acidic phosphorus compound comprised of a trihydrocarbyl phosphate and a dihydrocarbyl dithiophosphate derivative is disclosed. In addition to improved storage stability, the composition has improved wear performance when the ratio of polysulfides is controlled.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: April 5, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: John A. Zakarian, Michael J. Haire
  • Patent number: 7879773
    Abstract: A lubricating oil composition having superior storage stability and load-carrying effect is disclosed. The composition comprises four components: (1) an alkali metal borate; (2) an oil-soluble sulfur compound; (3) a trialkyl hydrogen phosphite; and (4) a mixture of greater than 50% neutralized acidic phosphates that are essentially free of monothiophosphates.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: February 1, 2011
    Assignee: Chevron U.S.A., Inc.
    Inventors: John A. Zakarian, Michael J. Haire
  • Patent number: 7790054
    Abstract: An antifreeze composition having improved thermal stability is provided. In one embodiment, the antifreeze concentrate composition comprises from 50 to 99 wt. % of a glycol-based freezing point depressant selected from the group of: alkylene glycols, glycol monoethers, glycerins, and mixtures thereof; 0.01 to 10 wt. % of at least one of a 2-ethylhexanoic acid, isononanoic acid and 3,5,5-trimethylhexanoic acid; and 0.01 to 5 wt. % of at least one of octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, neodecanoic acid, benzoic acid, 2-hydroxybenzoic acid, p-terbutylbenzoic acid, and mixtures thereof. In one embodiment, the composition is employed as a concentrate in admixture with 10 to 90 wt. % water.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: September 7, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventors: Serge S. Lievens, Jurgen P. DeKimpe
  • Patent number: 7674364
    Abstract: A hydraulic fluid composition having excellent seal compatibility is prepared from an isomerized base oil is provided. The composition comprising (i) 80 to 99.999 wt. % of a lubricating base oil having consecutive numbers of carbon atoms, less than 10 wt % naphthenic carbon by n-d-M, less than 0.10 wt. % olefins and less than 0.05 wt. % aromatics, a molecular weight of greater than 600 by ASTM D 2503-92 (Reapproved 2002), a wt % total molecules with cycloparaffinic functionality greater than 25 and a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 10; and (ii) optionally from 0.001 to 6 wt % of a viscosity modifier; and (iii) 0-10 wt % of at least an additive package. When used in operations, the composition results in an average volume change in a rubber seal of less than 3% and an average hardness change in the rubber seal of less than 1 pts. when tested under ASTM D 471-06 (SRE NBR1 at 100° C., 168 hours).
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: March 9, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia V. Lemay
  • Patent number: 7569507
    Abstract: The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomerized product, with increased yield of isomerized material and decreased production of light ends.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: August 4, 2009
    Assignee: Chevron U.S.A., Inc.
    Inventors: Stacey I. Zones, Guang Zhang, Kamala Krishna, Joseph A. Biscardi, Paul Marcantonio, Euthimios Vittoratos
  • Patent number: 7531082
    Abstract: In the refining of crude oil, hydroprocessing units such as hydrotreaters and hydrocrackers are used to remove impurities such as sulfur, nitrogen, and metals from the crude oil. They are also used to convert the feed into valuable products such as naphtha, jet fuel, kerosene and diesel. The current invention provides very high to total conversion of heavy oils to products in a single high-pressure loop, using multiple reaction stages. A hot high pressure separator is located between the first and second reaction stages. Overhead from the separator is treated in a distillate upgrader, which may operate in co-current or countercurrent mode.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: May 12, 2009
    Assignee: Chevron U.S.A. Inc.
    Inventors: Ujjal K. Mukherjee, Art Dahlberg
  • Patent number: 7485267
    Abstract: The process of this invention is directed to the removal of metals from an unsupported spent catalyst. The catalyst is subjected to leaching reactions. Vanadium is removed as a precipitate, while a solution comprising molybdenum and nickel is subjected to further extraction steps for the removal of these metals. Molybdenum may alternately be removed through precipitation.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: February 3, 2009
    Assignee: Chevron U.S.A. Inc.
    Inventor: Paul J. Marcantonio
  • Patent number: 7468126
    Abstract: The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomerized product, with increased yield of isomerized material and decreased production of light ends.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: December 23, 2008
    Assignee: Chevron U.S.A., Inc.
    Inventors: Stacey I. Zones, Guang Zhang, Kamala Krishna, Joseph A. Biscardi, Paul Marcantonio, Euthimios Vittoratos
  • Patent number: 7431822
    Abstract: Applicants have developed a new residuum full hydroconversion slurry reactor system that allows the catalyst, unconverted oil, hydrogen, and converted oil to circulate in a continuous mixture throughout an entire reactor with no confinement of the mixture. The mixture is separated internally, within one of more of the reactors, to separate only the converted oil and hydrogen into a vapor product while permitting the unconverted oil and the slurry catalyst to continue on into the next sequential reactor as a liquid product. A portion of the unconverted oil is then converted to lower boiling point hydrocarbons in the next reactor, once again creating a mixture of unconverted oil, hydrogen, converted oil, and slurry catalyst. Further hydroprocessing may occur in additional reactors, fully converting the oil. The oil may alternately be partially converted, leaving a concentrated catalyst in unconverted oil which can be recycled directly to the first reactor.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: October 7, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Darush Farshid, James Murphy, Bruce Reynolds
  • Patent number: 7431824
    Abstract: The instant invention is directed to a process employing slurry catalyst compositions in the upgrading of heavy oils. The slurry catalyst composition is not permitted to settle, which would result in possible deactivation. The slurry is recycled to an upgrading reactor for repeated use and products require no further separation procedures for catalyst removal.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: October 7, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kaidong Chen, Julie Chabot
  • Patent number: 7431823
    Abstract: The instant invention is directed to a new residuum full hydroconversion slurry reactor system that allows the catalyst, unconverted oil and converted oil to circulate in a continuous mixture throughout an entire reactor with no confinement of the mixture. The mixture is partially separated in between the reactors to remove only the products and hydrogen, while permitting the unconverted oil and the slurry catalyst to continue on into the next sequential reactor where a portion of the unconverted oil is converted to lower boiling point hydrocarbons, once again creating a mixture of unconverted oil, converted oil, and slurry catalyst. Further hydroprocessing may occur in additional reactors, fully converting the oil. The oil may alternately be partially converted, leaving a highly concentrated catalyst in unconverted oil which can be recycled directly to the first reactor.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: October 7, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Darush Farshid, Bruce Reynolds
  • Patent number: 7431831
    Abstract: A new residuum full hydroconversion slurry reactor system has been developed that allows the catalyst, unconverted oil, products and hydrogen to circulate in a continuous mixture throughout an entire reactor with no confinement of the mixture. The mixture is partially separated in between the reactors to remove only the products and hydrogen while permitting the unconverted oil and the slurry catalyst to continue on into the next sequential reactor. In the next reactor, a portion of the unconverted oil is converted to lower boiling point hydrocarbons, once again creating a mixture of unconverted oil, products, hydrogen and slurry catalyst. Further hydroprocessing may occur in additional reactors, fully converting the oil. The oil may alternately be partially converted, leaving a highly concentrated catalyst in unconverted oil which can be recycled directly to the first reactor. The slurry reactor system is, in this invention, preceded by an in-line pretreating step, such as hydrotreating or deasphalting.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: October 7, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Darush Farshid, Bruce Reynolds
  • Patent number: 7427349
    Abstract: The present invention relates to the field of hydroprocessing, and more particularly relates to a process directed to fuels hydrocracking and distillate feed hydrofining. This process has at least two stages. A relatively unconverted hydrofined product may be removed prior to the second stage, providing flexibility. In another embodiment, fresh feed may be added prior to the second stage. In both embodiments, fuels production is maintained at a constant level.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: September 23, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Ujjal K. Mukherjee, Kevin L. Hofer, Darush Farshid
  • Patent number: 7410928
    Abstract: The instant invention is directed to the preparation of a catalyst composition suitable for the hydroconversion of heavy oils. The catalyst composition is prepared by a series of steps, involving mixing a Group VIB metal oxide particularly molybdenum oxide and aqueous ammonia to form an aqueous mixture, and sulfiding the mixture to form a slurry. The slurry is then promoted with a Group VIII metal. Subsequent steps involve mixing the slurry with a hydrocarbon oil and combining the resulting mixture with hydrogen gas and a second hydrocarbon oil having a lower viscosity than the first oil. An active catalyst composition is thereby formed.
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: August 12, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kaidong Chen, Pak C. Leung, Bruce E. Reynolds