Patents by Inventor Stephen Arrowsmith

Stephen Arrowsmith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8999903
    Abstract: Para-alkylated substituted diphenylamines are made by catalytically alkylating diphenylamine with a branched-chain alkene, such as propene, oligomer mixture in which the oligomer present in the greatest percentage has 15-24 carbon atoms. The alkylated diphenylamines are useful crankcase lubricant additives such as for reducing piston deposits and engine sludge.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: April 7, 2015
    Assignee: Infineum International Limited
    Inventors: Stephen Arrowsmith, Christopher J. Booth, Aubrey L. Burrows, Paul Wilson, Neal J. Milne, Lin Wangkan, Jacob Emert, Laurent Chambard
  • Patent number: 8759262
    Abstract: A lubricating oil composition for internal combustion engines, particularly heavy duty diesel (HDD) engines, having reduced phosphorus, sulfur and sulfated ash contents that provide excellent piston cleanliness performance and contain an amount of phenate detergent that introduces a relatively large amount of phenate soap into the lubricating oil composition.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: June 24, 2014
    Assignee: Infineum International Limited
    Inventors: Matthew D. Irving, Stephen Arrowsmith
  • Patent number: 8709988
    Abstract: Lubricating oil compositions having a sulfated ash content of no more than 1.0 mass %, which contain a major amount of oil of lubricating viscosity, a minor amount of calcium salicylate detergent, an amount of a magnesium-based detergent providing at least 200 ppm of magnesium, and a basic, low molecular weight, nitrogen-containing dispersant, which compositions provide improved top ring wear protection in internal combustion engines.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: April 29, 2014
    Assignee: Infineum International Limited
    Inventors: Stephen Arrowsmith, Matthew D. Irving
  • Patent number: 7906469
    Abstract: Lubricating oil compositions having a sulfated ash content of no more than 1.0 mass %, which contain a major amount of oil of lubricating viscosity, a minor amount of calcium salicylate detergent, an amount of a magnesium-based detergent providing the lubricating oil composition with at least 200 ppm of magnesium, an amount of a sulfur-containing molybdenum compound providing the lubricating oil composition with at least 20 ppm of molybdenum, and at least one nitrogen-containing dispersant providing the lubricating oil composition with at least 0.9 mass % nitrogen, which compositions provide improved top ring wear protection in internal combustion engines.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: March 15, 2011
    Assignee: Infineum International Limited
    Inventors: Stephen Arrowsmith, Matthew D. Irving
  • Publication number: 20100173811
    Abstract: Para-alkylated substituted diphenylamines are made by catalytically alkylating diphenylamine with a branched-chain alkene, such as propene, oligomer mixture in which the oligomer present in the greatest percentage has 15-24 carbon atoms. The alkylated diphenylamines are useful crankcase lubricant additives such as for reducing piston deposits and engine sludge.
    Type: Application
    Filed: June 6, 2008
    Publication date: July 8, 2010
    Inventors: Stephen Arrowsmith, Christopher J. Booth, Aubrey L. Burrows, Paul Wilson, Neal J. Milne, Lin Wangkan, Jacob Emert, Laurent Chambard
  • Patent number: 7660198
    Abstract: A method of identifying passive seismic events in seismic data that contains at least first seismic data traces acquired at a first seismic receiver and second seismic data traces acquired at a second receiver spatially separated from the first receiver comprises determining an overall measure of similarity for a pair of events in the seismic traces. The overall measure of similarity is indicative of similarity between the events acquired at the first seismic receiver and of similarity between the events acquired at the second seismic receiver. In one method, the overall measure of similarity is an overall cross-correlation coefficient. The overall cross-correlation coefficient is found by determining a first correlation coefficient for the pair of events from the data acquired at the first receiver and determining a second correlation coefficient for the pair of events from the data acquired at the second receiver.
    Type: Grant
    Filed: June 17, 2004
    Date of Patent: February 9, 2010
    Assignee: WesternGeco LLC
    Inventors: Stephen Arrowsmith, Leo Eisner
  • Publication number: 20080312472
    Abstract: Para-alkylated diphenylamine antioxidants are made by catalytically alkylating diphenylamine with an alkylating agent in the form of a mixture of branched-chain oligomers of butene, the alkylating agent having an average molecular weight in the range of 140 to 300 and a methylvinylidene isomer content of no greater than 10%.
    Type: Application
    Filed: June 14, 2007
    Publication date: December 18, 2008
    Inventors: Stephen Arrowsmith, Christopher James Booth, Aubrey L. Burrows, Paul Wilson, Ronald P. Wangner
  • Publication number: 20080070818
    Abstract: A lubricating oil composition including at least one sulphurized overbased metal phenate detergent prepared from a C9-C15 alkyl phenol, at least one sulphurizing agent, at least one metal and at least one overbasing agent. The detergent includes less than 6.0% by combined mass of unsulphurized C9-C15 alkyl phenol and its unsulphurized metal salt. The lubricating oil composition exhibits an improved rate of acid neutralization.
    Type: Application
    Filed: September 6, 2007
    Publication date: March 20, 2008
    Inventors: Stephen Arrowsmith, Laura Kosidowski, Jeremy R. Spencer, Peter D. Watts
  • Publication number: 20070149419
    Abstract: A lubricating oil composition for internal combustion engines, particularly heavy duty diesel (HDD) engines, having reduced phosphorus, sulfur and sulfated ash contents that provide excellent piston cleanliness performance and contain an amount of phenate detergent that introduces a relatively large amount of phenate soap into the lubricating oil composition.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 28, 2007
    Inventors: Matthew Irving, Stephen Arrowsmith
  • Publication number: 20060285438
    Abstract: A method of identifying passive seismic events in seismic data that contains at least first seismic data traces acquired at a first seismic receiver and second seismic data traces acquired at a second receiver spatially separated from the first receiver comprises determining an overall measure of similarity for a pair of events in the seismic traces. The overall measure of similarity is indicative of similarity between the events acquired at the first seismic receiver and of similarity between the events acquired at the second seismic receiver. In one method, the overall measure of similarity is an overall cross-correlation coefficient. The overall cross-correlation coefficient is found by determining a first correlation coefficient for the pair of events from the data acquired at the first receiver and determining a second correlation coefficient for the pair of events from the data acquired at the second receiver.
    Type: Application
    Filed: June 17, 2004
    Publication date: December 21, 2006
    Inventors: Stephen Arrowsmith, Leo Eisner
  • Publication number: 20060116299
    Abstract: Lubricating oil compositions having a sulfated ash content of no more than 1.0 mass %, which contain a major amount of oil of lubricating viscosity, a minor amount of calcium salicylate detergent, an amount of a magnesium-based detergent providing the lubricating oil composition with at least 200 ppm of magnesium, an amount of a sulfur-containing molybdenum compound providing the lubricating oil composition with at least 20 ppm of molybdenum, and at least one nitrogen-containing dispersant providing the lubricating oil composition with at least 0.9 mass % nitrogen, which compositions provide improved top ring wear protection in internal combustion engines.
    Type: Application
    Filed: November 29, 2005
    Publication date: June 1, 2006
    Inventors: Stephen Arrowsmith, Matthew Irving
  • Publication number: 20060116300
    Abstract: Lubricating oil compositions having a sulfated ash content of no more than 1.0 mass %, which contain a major amount of oil of lubricating viscosity, a minor amount of calcium salicylate detergent, an amount of a magnesium-based detergent providing at least 200 ppm of magnesium, and a basic, low molecular weight, nitrogen-containing dispersant, which compositions provide improved top ring wear protection in internal combustion engines.
    Type: Application
    Filed: November 29, 2005
    Publication date: June 1, 2006
    Inventors: Stephen Arrowsmith, Matthew Irving
  • Patent number: 7026273
    Abstract: A crankcase lubricating oil composition comprises an oil of lubricating viscosity, in a major amount, and, in respective minor amounts, a boron-containing additive and one or more co-additives, wherein the lubricating oil composition has greater than 200 ppm by mass of boron, less than 600 ppm by mass of phosphorus and less than 4000 ppm by mass of sulfur, based on the mass of the oil composition. Such compositions demonstrate provide improved wear performance.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: April 11, 2006
    Assignee: Infineum International Limited
    Inventors: Robert Robson, Roger W. Glyde, Alisdair J. Brown, Simon S. M. Chung, Stephen Arrowsmith
  • Patent number: 7018958
    Abstract: A lubricating oil composition having a total base number of at least about 8, comprising a major amount of oil of lubricating viscosity; an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into the lubricating oil composition no more than 0.06 wt. % of phosphorus; at least 1.2 wt. % of hindered phenol antioxidant; and boron, and/or a boron-containing compound or compounds in an amount providing the lubricating oil composition with at least 200 ppm by weight of boron, all weight percentages being based on the total weight of the lubricating oil composition.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: March 28, 2006
    Assignee: Infineum International Limited
    Inventors: Stephen Arrowsmith, Nancy Z. Diggs, Andrew J. D. Ritchie, Jorge O. Pain
  • Publication number: 20040235688
    Abstract: The use, in a minor amount, of a detergent composition comprising one or more metal detergents which comprises metal salts of organic acids, wherein the detergent composition comprises more than 50 mole %, based on the moles of the metal salts of organic acids in the detergent composition, of:
    Type: Application
    Filed: June 22, 2004
    Publication date: November 25, 2004
    Inventors: Christopher J. Locke, Mark G. Stevens, Peter Wrench, Stephen Arrowsmith, Rebecca C. Castle, Jane R. Galsworthy
  • Patent number: 6784143
    Abstract: The use, in a minor amount, of a detergent composition comprising one or more metal detergents which comprises metal salts of organic acids, wherein the detergent composition comprises more than 50 mole %, based on the moles of the metal salts of organic acids in the detergent composition, of: (I) a metal salt of an aromatic carboxylic acid, or (II) a metal salt of a phenol, or (III) both a metal salt of an aromatic carboxylic acid and a metal salt of a phenol, in a lubricating oil composition for improving the oxidation resistance of the lubricating oil composition, wherein the amount of phosphorus and sulfur in the oil composition is less than 0.09 mass % and at most 0.5 mass % respectively, based on the mass of the oil composition. It has also been found that a detergent composition comprising more than 50 mole % of a metal salt of an aromatic carboxylic acid improves the reduction in wear in an engine.
    Type: Grant
    Filed: May 9, 2002
    Date of Patent: August 31, 2004
    Assignee: Infineum International Ltd.
    Inventors: Christopher J. Locke, Mark G. Stevens, Peter Wrench, Stephen Arrowsmith, Rebecca C. Castle, Jane R. Galsworthy
  • Publication number: 20040127371
    Abstract: A lubricating oil composition for use in an internal combustion engine operated with a fuel having a sulphur content of less than 50 ppm, that contains a minor amount of at least one metal-containing detergent, which lubricating oil composition, when formulated for use in a diesel engine has a total ash content of less than 1.0 wt. %, and when formulated for use in a gasoline engine has a total ash content of less than 0.7 wt. %.
    Type: Application
    Filed: August 27, 2003
    Publication date: July 1, 2004
    Inventors: Stephen Arrowsmith, Alisdair J. Brown
  • Publication number: 20040077506
    Abstract: A lubricating oil composition having a total base number of at least about 8, comprising a major amount of oil of lubricating viscosity; an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into the lubricating oil composition no more than 0.06 wt. % of phosphorus; at least 1.2 wt. % of hindered phenol antioxidant; and boron, and/or a boron-containing compound or compounds in an amount providing the lubricating oil composition with at least 200 ppm by weight of boron, all weight percentages being based on the total weight of the lubricating oil composition.
    Type: Application
    Filed: October 22, 2002
    Publication date: April 22, 2004
    Inventors: Stephen Arrowsmith, Nancy Z. Diggs, Andrew J. D. Ritchie, Jorge O. Pain
  • Publication number: 20030148895
    Abstract: A crankcase lubricating oil composition comprises an oil of lubricating viscosity, in a major amount, and, in respective minor amounts, a boron-containing additive and one or more co-additives, wherein the lubricating oil composition has greater than 200 ppm by mass of boron, less than 600 ppm by mass of phosphorus and less than 4000 ppm by mass of sulfur, based on the mass of the oil composition. Such compositions demonstrate provide improved wear performance.
    Type: Application
    Filed: October 22, 2002
    Publication date: August 7, 2003
    Inventors: Robert Robson, Roger W. Glyde, Alisdair J. Brown, Simon S. M. Chung, Stephen Arrowsmith
  • Publication number: 20030134758
    Abstract: The use of an effective amount of one or more compounds capable of reducing friction coefficients under mixed lubrication or boundary lubrication conditions in a heavy duty diesel engine lubricating oil composition for improving the fuel economy of a heavy duty diesel engine.
    Type: Application
    Filed: December 12, 2002
    Publication date: July 17, 2003
    Inventors: Charles H. Bovington, Stephen Arrowsmith, Rebecca C. Castle, Peter Wrench