Patents Represented by Attorney John W. Ditsler
  • Patent number: 5849677
    Abstract: This invention concerns a process for preparing a sulfurized olefin containing reduced amounts of thiones using a low molecular weight hydrocarbon to precipitate the thiones from the sulfurized olefin.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: December 15, 1998
    Assignee: Exxon Chemical Patents Inc
    Inventor: Michael Gerald Romanelli
  • Patent number: 5750476
    Abstract: The anti-shudder durability of power transmitting fluids, particularly automatic transmission fluids, is improved by incorporating a combination of low potency friction modifiers and phosphorus-containing compounds. The anti-shudder durability of these fluids may be further enhanced by inclusion of a metallic detergent and/or a polyol ester friction modifier.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: May 12, 1998
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Roger Keith Nibert, Ricardo Alfredo Bloch, Maryann Devine, Manoj Tandon, Raymond Frederick Watts
  • Patent number: 5622922
    Abstract: A homogenous product is formed by heating at a temperature in the range of from 50.degree. to 150.degree. C. a mixture of a benzotriazole and a 2,5-dihydrocarbyldithio-1,3,4-thiadiazole.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: April 22, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Dean B. Clarke, Dale R. Carroll
  • Patent number: 5397487
    Abstract: A combination of succinic anhydride amine derivatives and tetra propenyl succinic acid derivative rust inhibitors has been found to be synergistically effective in reducing the formation of rust in lubricating oils.
    Type: Grant
    Filed: August 26, 1993
    Date of Patent: March 14, 1995
    Assignee: Exxon Research & Engineering Co.
    Inventors: Lilianna Z. Pillon, Lloyd E. Reid, Andre E. Asselin
  • Patent number: 5391313
    Abstract: A refrigerator working fluid which comprises(a) tetrafluoroethane, and(b) a synthetic ester lubricant with a viscosity of about 150 cSt or less at 40.degree. C. and having the formula (R.sub.1 -R.sub.2).sub.n R.sub.3wherein R.sub.1 is ##STR1## in which R.sub.5, R.sub.6 and R.sub.7 are each independently hydrocarbyl group of from 1 to 7 carbon atoms with the proviso that the sum of carbon atoms in R.sub.5 +R.sub.6 +R.sub.7 is from 3 to 9,R.sub.2 is selected from the group consisting of (CH.sub.2 --CH.sub.2 --O--).sub.b, ##STR2## and mixtures thereof, where b is an integer from 1 to 3, R.sub.3 is a monobasic or polybasic carboxylic acid radical of the formula ##STR3## where R.sub.4 is a hydrocarbyl group having m carbon atoms where m is an integer from 1 to 9, andn is an integer from 1 to 4.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: February 21, 1995
    Assignee: Exxon Research and Engineering Company
    Inventors: Shlomo Antika, Thomas G. Dietz, Richard H. Schlosberg, David W. Turner, George A. Weisgerber
  • Patent number: 5277770
    Abstract: Plasma initiators that have become deactivated due to the accumulation of carbonaceous deposits, sulfur deposits, or both thereon can be regenerated by contact with an oxygen-containing gas in the presence of microwave radiation.
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: January 11, 1994
    Assignee: Exxon Research & Engineering Co.
    Inventor: William J. Murphy
  • Patent number: 5277771
    Abstract: Plasma initiators that have become deactivated due to the accumulation of carbonaceous deposits, sulfur deposits, or both thereon can be regenerated by contact with a gas containing molecular hydrogen in the presence of microwave radiation.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: January 11, 1994
    Assignee: Exxon Research & Engineering Company
    Inventors: William J. Murphy, Alberto Ravella
  • Patent number: 5264006
    Abstract: Distillate fuel compositions containing an alkyl ether mono amine having the formulaRO[C.sub.4 H.sub.8 O].sub.(9-18) CH.sub.2 CH.sub.2 CH.sub.2 NH.sub.2whereR is a highly branched alkyl group derived from a Guerbet alcohol containing between 12 and 40 carbon atomsare effective in reducing the formation of intake valve deposits in internal combustion engines.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: November 23, 1993
    Assignee: Exxon Research and Engineering Co.
    Inventors: Alan M. Schilowitz, James A. Krogh, Anita R. Mokadam, J. Michael Clumpner, Paul J. Berlowitz
  • Patent number: 5254275
    Abstract: The addition of an O-alkyl-N-alkoxycarbonylthionocarbamate to a lubricating oil imparts antiwear, antioxidant and/or friction reducing performance to the oil.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: October 19, 1993
    Assignee: Exxon Research and Engineering Company
    Inventors: Morton Beltzer, Jacob J. Habeeb, Karla S. Colle
  • Patent number: 5250081
    Abstract: A process for reducing smoke emitted from a two-cycle internal combustion engine wherein the engine is operated with a lubricant oil-fuel mixture containing certain quaternary ammonium hydroxides. A preferred quaternary ammonium hydroxide is tricapryl methyl quaternary ammonium hydroxide.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: October 5, 1993
    Assignee: Exxon Research & Engineering Company
    Inventors: Jacob J. Habeeb, Christopher J. May
  • Patent number: 5248407
    Abstract: Paving binders, especially hot mix paving mixtures, having excellent storage stability, reduced binder runoff, and high temperature viscosity are formed by adding a copolymer of ethylene with an alkyl acrylate or vinyl acetate and a neutralized sulfonated polymer to the asphalt. Preferably, the alkyl acrylate is methyl acrylate and the neutralized sulfonated polymer is a terpolymer of ethylene, propylene, and a diene monomer.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: September 28, 1993
    Assignee: Exxon Research and Engineering Company
    Inventors: Jacques G. Bardet, Martin L. Gorbaty, Nicholas C. Nahas
  • Patent number: 5228977
    Abstract: This invention relates to a method for producing asphalt that has improved low temperature properties. More specifically, the penetration and Penetration Index of an asphalt can be increased if the asphalt is heat soaked in the presence of a dehydrogenation agent at a temperature above the temperature at which oxidation of the asphalt occurs and below the temperature at which coking is initiated. Polyvinyl chloride and a chlorinated wax are preferred dehydrogenation agents.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: July 20, 1993
    Assignee: Exxon Research & Engineering Company
    Inventors: Lyle E. Moran, William J. Murphy
  • Patent number: 5229021
    Abstract: The addition of a polyalkylmethacrylate having a weight average molecular weight of at least 600,000 has been found to be effective in reducing the pour point of a wax isomerate to a level that cannot be obtained with conventional pour point depressants. In a preferred embodiment, the wax isomerate is a slack wax isomerate.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: July 20, 1993
    Assignee: Exxon Research & Engineering Company
    Inventors: Lillanna Z. Pillon, Andre E. Asselin
  • Patent number: 5227082
    Abstract: The rust inhibiting and demulsibility performance of a lubricating oil can be synergistically enhanced by incorporating a rust inhibitor having at least one COOH acid group and a particular class of pyridine derivatives.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: July 13, 1993
    Assignee: Exxon Research and Engineering Company
    Inventors: Lilianna Z. Pillon, Andre E. Asselin
  • Patent number: 5225094
    Abstract: The rust inhibition capability of a lubricating oil having an average ring number per mole of less than 1.5 can be enhanced by adding a rust inhibitor that is capable of reducing the oil/water interfacial tension to between about 1 to about 4 mN/m.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: July 6, 1993
    Assignee: Exxon Research and Engineering Company
    Inventors: Lilianna Z. Pillon, Andre E. Asselin, Gerald A. MacAlpine
  • Patent number: 5225081
    Abstract: Used lubricating oils can be rejuvenated by passing the oil through a filter system comprising a hollow solid composite that contains a thermoplastic binder and an active filter media of a chemically active filter media, a physically active filter media, or mixtures thereof. In a preferred embodiment, the composite is formed by forcing a substantially uniform mixture of thermoplastic binder particles, active filter media particles, solvent 600 Neutral base oil, and sodium stearate through an extrusion die of substantially uniform cross-section, wherein the mixture is subjected to heat, pressure, and cooling to consolidate the mixture so that it emerges from the die as a hollow solid composite. Most preferably, the composite will surround an inactive filter media located within the filter system.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: July 6, 1993
    Assignee: Exxon Research and Engineering Co.
    Inventor: Darrell W. Brownawell
  • Patent number: 5219478
    Abstract: The addition of an O-alkyl-N-alkoxycarbonylthionocarbamate salt of dithiobenzoic acid to a lubricating oil imparts antiwear and/or antioxidation performance to the oil.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: June 15, 1993
    Assignee: Exxon Research and Engineering Co.
    Inventors: Jacob J. Habeeb, Morton Beltzer
  • Patent number: 5215548
    Abstract: Distillate fuel compositions containing an amine salt of a sulfonic acid and a low volatility carrier fluid are effective in reducing the formation of intake valve deposits in internal combustion engines. Gasoline containing diamine salts in combination with a polyol ester carrier fluid is a particularly preferred distillate fuel composition.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: June 1, 1993
    Assignee: Exxon Research and Engineering Company
    Inventors: Thomas L. Ashcraft, Alan M. Schilowitz, Larry D. Talley, Paul J. Berlowitz
  • Patent number: 5205915
    Abstract: Methane can be effectively converted to acetylene, ethylene, and hydrogen by subjecting the methane to continuous microwave radiation in the presence of at least one plasma initiator that is capable of initiating an electric discharge in an electromagnetic field.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: April 27, 1993
    Assignee: Exxon Research & Engineering Company
    Inventors: Alberto Ravella, William J. Murphy
  • Patent number: 5205912
    Abstract: Methane can be effectively converted to acetylene, ethylene, and hydrogen by subjecting the methane to pulsed microwave radiation in the presence of at least one plasma initiator that is capable of initiating an electric discharge in an electromagnetic field.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: April 27, 1993
    Assignee: Exxon Research & Engineering Company
    Inventor: William J. Murphy