Patents Assigned to Castrol Limited
  • Patent number: 8703873
    Abstract: The composition and preparation of multifunctional graft polymers useful as dispersants are described. The dispersants described are suitable for controlling sludge and varnish as well as soot, friction and wear. The product is useful as a lubricant additive.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: April 22, 2014
    Assignee: Castrol Limited
    Inventor: Richard P. Sauer
  • Patent number: 8618028
    Abstract: Fire resistant lubricating grease compositions resistant to self ignition and/or capable of self extinguishment when contacted with surfaces having temperatures of up to 900° C. are disclosed. The invention provides for grease compositions comprising (1) base oil (which can be mineral, vegetable, synthetic or combinations thereof), (2) at least one grease thickener (selected from calcium sulfonates or lithium-based soaps), and (3) water as major components. The invention also provides a method for the preparation of the grease composition and a method for lubrication of bearings, gears, surfaces and other lubricated components comprising use of the grease composition of the present invention. The grease compositions of this invention display excellent fire resistance properties and still have outstanding physical and performance characteristics for applications where temperatures and loads are high, shock loading is significant and in the presence of significant amounts of water.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: December 31, 2013
    Assignee: Castrol Limited
    Inventors: Hocine Faci, Robert N. Cisler, Alex M. Medrano
  • Patent number: 8603954
    Abstract: The present invention relates to a graft polymer of (a) a polyalphaolefin having a weight average molecular weight of less than 15000 and a polydispersity of 1.1 to 10; (b) a nitrogenous, ethylenically unsaturated, aliphatic or aromatic, graftable monomer having from 2 to about 50 carbon atoms; and (c) an organo-metallic compound selected from organo-molybdenum, organo-titanium, organo-manganese compounds and mixtures thereof; a process for making the graft polymer; and a lubricating oil composition comprising a major amount of a base oil and a minor amount of the graft polymer.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: December 10, 2013
    Assignee: Castrol Limited
    Inventor: Richard P. Sauer
  • Publication number: 20130167431
    Abstract: The use as an anti-wear additive and/or friction modifier in a non-aqueous lubricant composition and/or in a fuel composition of at least one long chain fatty acid ester of a hydroxy carboxylic acid in which the long chain fatty acid has at least 4 carbon atoms and the ester is an oil-soluble ester of a mono- or poly-hydroxy carboxylic acid having 1 to 4 groups which are independently carboxylic acid groups or lower hydrocarbyl esters thereof and in which, when the hydroxy carboxylic acid is a mono-hydroxy carboxylic acid, the ester has a long chain fatty acid ester moiety of the hydroxy group of the hydroxy carboxylic acid and, when the hydroxy carboxylic acid is a poly-hydroxy carboxylic acid, the ester has independently long chain fatty acid ester moieties of one or two of the hydroxy groups of the poly-hydroxy carboxylic acid. Also, a non-aqueous lubricant composition and a fuel composition for an internal combustion engine which comprises at least one of said long chain fatty acid esters.
    Type: Application
    Filed: October 20, 2011
    Publication date: July 4, 2013
    Applicant: Castrol Limited
    Inventor: Kevin Richard West
  • Publication number: 20130072408
    Abstract: The use of an oil-soluble mono-, di-, or tri-glyceride of at least one hydroxy polycarboxylic acid, or a derivative thereof, as an anti-wear additive and/or friction modifier in a non-aqueous lubricant composition and/or in a fuel composition. Also, a non-aqueous lubricant composition and a fuel composition for an internal combustion engine which comprise at least one additive which is an oil-soluble mono-, di-, or tri-glyceride of at least one hydroxy polycarboxylic acid, or a derivative thereof.
    Type: Application
    Filed: June 21, 2011
    Publication date: March 21, 2013
    Applicant: Castrol Limited
    Inventors: Ieuan Stephen Adams, Rana Ali, John Philip Davies, Kevin Richard West
  • Patent number: 8327818
    Abstract: Apparatus and method for adding one or more additives to an engine lubricant, while the lubricant is circulating within an engine having an engine lubricant filter with a by-pass valve which opens when the pressure of the lubricant passing through the filter exceeds a pre-determined back-pressure value in which the apparatus further comprises an additive chamber containing one or more additives operably connected to the by-pass valve such that when the by-pass valve opens at the pre-determined back-pressure, at least some of the lubricant is caused to flow through the additive chamber and contact the one or more additives.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: December 11, 2012
    Assignee: Castrol Limited
    Inventors: Adrian Colin Jefferies, Gordon David Lamb
  • Patent number: 8263537
    Abstract: A polyalkene dispersant comprised of low MW polyalkene having an average molecular weight range of about 300 to about 10,000 and an ethylenically-unsaturated, aliphatic or aromatic, nitrogen- and oxygen-containing graftable monomer and methods of making the same are disclosed. The monomers are formed by reacting an acylating agent with amines having one or more primary or secondary amine to form a reaction product. Graft polyalkene dispersants comprising such monomers are formed by grafting the reaction product to the polyalkene backbone. Also described is lubricating oil comprising base oil and the dispersant polyalkene as described above.
    Type: Grant
    Filed: February 23, 2009
    Date of Patent: September 11, 2012
    Assignee: Castrol Limited
    Inventor: Irwin L. Goldblatt
  • Patent number: 8099207
    Abstract: Method for determining the performance of a motor vehicle consumable, including engine lubricant, fuel and tires in a motor vehicle having an engine with at least one fuel injection valve, a lubricating system and a CANbus network having at least three network nodes, each operably connected to a computer. The method includes operating the vehicle while supplying the engine with fuel through a fuel injection valve and lubricating the engine with the engine lubricant. A first CANbus network node transmits to the computer a signal indicative of the engine fuelling rate based upon the opening time of a fuel injection valve. One or more second CANbus network nodes transmit signals to the computer indicative of one or more variables indicative of the power output of the engine, and one or more third CANbus network nodes transmit signals to the computer indicative of the vehicle operating conditions.
    Type: Grant
    Filed: August 16, 2007
    Date of Patent: January 17, 2012
    Assignee: Castrol Limited
    Inventors: Timothy Edward Fletcher, William Hugh Preston
  • Publication number: 20110287992
    Abstract: The composition and preparation of multiple graft low molecular weight polymers useful as dispersants are described. The dispersants described are suitable for controlling sludge and varnish as well as soot. The product is useful as a lubricant additive and a fuel additive.
    Type: Application
    Filed: November 16, 2010
    Publication date: November 24, 2011
    Applicant: Castrol Limited
    Inventors: Irwin L. Goldblatt, Richard P. Sauer, Shean-jer Chen
  • Publication number: 20110251112
    Abstract: The present invention relates to a graft polymer of (a) a polyalphaolefin having a weight average molecular weight of less than 15000 and a polydispersity of 1.1 to 10; (b) a nitrogenous, ethylenically unsaturated, aliphatic or aromatic, graftable monomer having from 2 to about 50 carbon atoms; and (c) an organo-metallic compound selected from organo-molybdenum, organo-titanium, organo-manganese compounds and mixtures thereof; a process for making the graft polymer; and a lubricating oil composition comprising a major amount of a base oil and a minor amount of the graft polymer.
    Type: Application
    Filed: April 1, 2011
    Publication date: October 13, 2011
    Applicant: Castrol Limited
    Inventor: Richard P. Sauer
  • Publication number: 20110245119
    Abstract: The composition and preparation of multifunctional graft polymers useful as dispersants are described. The dispersants described are suitable for controlling sludge and varnish as well as soot, friction and wear. The product is useful as a lubricant additive.
    Type: Application
    Filed: March 29, 2011
    Publication date: October 6, 2011
    Applicant: Castrol Limited
    Inventor: Richard P. Sauer
  • Patent number: 7981847
    Abstract: A graft copolymer containing one or more ethylenically-unsaturated, aliphatic or aromatic, nitrogen- and oxygen-containing graftable monomers grafted to a polyolefin is disclosed. Novel monomers, methods of making such monomers, and graft copolymers comprising such monomers are based on reacting an acylating agent with an amine to form a reaction product. The reaction product may include more than one chemical compound formed from the combination of the acylating agent and the amine. The monomer is the graftable, ethylenically unsaturated, aliphatic or aromatic, nitrogen- and oxygen-containing compound(s) of the reaction product. The monomer may, but need not, be recovered from the product mixture. The preferred monomer is the reaction product of maleic anhydride and 4-aminodiphenylamine. Also described is a method of making a dispersant viscosity index improver. The monomer of the present invention may be grafted to a polyolefin in solutions or melts.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: July 19, 2011
    Assignee: Castrol Limited
    Inventors: Irwin L. Goldblatt, Shean-Jer Chen, Manish R. Patel, Stephen T. McKenna
  • Publication number: 20110082060
    Abstract: Fire resistant lubricating grease compositions resistant to self ignition and/or capable of self extinguishment when contacted with surfaces having temperatures of up to 9000 C are disclosed. The invention provides for grease compositions comprising (1) base oil (which can be mineral, vegetable, synthetic or combinations thereof), (2) at least one grease thickener (selected from calcium sulfonates or lithium-based soaps), and (3) water as major components. The invention also provides a method for the preparation of the grease composition and a method for lubrication of bearings, gears, surfaces and other lubricated components comprising use of the grease composition of the present invention. The grease compositions of this invention display excellent fire resistance properties and still have outstanding physical and performance characteristics for applications where temperatures and loads are high, shock loading is significant and in the presence of significant amounts of water.
    Type: Application
    Filed: June 1, 2009
    Publication date: April 7, 2011
    Applicant: Castrol Limited
    Inventors: Hocine Faci, Robert N. Cisler, Alex M. Medrano
  • Publication number: 20100200609
    Abstract: This invention relates to a vehicle fluid dispensing apparatus and a method of use. The apparatus includes a plurality of motive force devices for fluid communication with a plurality of reservoirs. The apparatus also includes a plurality of metering devices in fluid communication with the motive force devices and a single nozzle in fluid communication with the plurality of motive force devices.
    Type: Application
    Filed: April 13, 2010
    Publication date: August 12, 2010
    Applicant: Castrol Limited
    Inventor: Daniel J. Cadigan
  • Patent number: 7716972
    Abstract: A method for monitoring the performance of a compression-ignition, internal combustion engine which method comprises lubricating the engine with a crankcase lubricant, and introducing a fuel to the engine to operate the engine characterized in that the fuel comprises greater than 50% by weight of petroleum-based, middle distillate fuel oil and/or a Fischer Tropsch derived middle distillate fuel oil and 2.5% to 25% by weight of at least one lower alkyl ester of a fatty acid, and the performance of the engine is monitored by measuring the rate of ingress of lower alkyl ester of a fatty acid from the fuel into the crankcase lubricant by infra red spectroscopic analysis of the crankcase lubricant.
    Type: Grant
    Filed: August 22, 2006
    Date of Patent: May 18, 2010
    Assignee: Castrol Limited
    Inventor: William Hugh Preston
  • Publication number: 20090326756
    Abstract: A method for determining the performance of at least one motor vehicle consumable selected from the group consisting of engine lubricant, fuel and tyres, in a motor vehicle having an engine with at least one fuel injection valve, a lubricating system and a CANbus network comprising at least three network nodes, each operably connected to a computer, which method comprises: operating the vehicle whilst supplying the engine with the fuel through at least one fuel injection valve and lubricating the engine with the engine lubricant characterised in that: a first CANbus network node transmits to the computer, a signal indicative of the engine fuelling rate based upon the opening time of at least one of the fuel injection valves; one or more second CANbus network nodes transmit one or more signals to the computer indicative of one or more variables indicative of the power output of the engine; one or more third CANbus network nodes transmit one or more signals to the computer indicative of the vehicle operating co
    Type: Application
    Filed: August 16, 2007
    Publication date: December 31, 2009
    Applicant: Castrol Limited
    Inventors: Timothy Edward Fletcher, William Hugh Preston
  • Publication number: 20090126469
    Abstract: A method of monitoring the fire resistance of hydraulic fluids involves measuring a property of the hydraulic fluid that changes as the hydraulic fluid is used; relating the measurement to the fire resistance of the hydraulic fluid; and if necessary, taking remedial action in order to improve the fire resistance of the hydraulic fluid. A suitable property is the molecular weight of polymer anti-mist additives such as polymethyl methacrylate and the fire resistance may be improved by adding to the hydraulic fluid, a concentrate of the polymer in a suitable solvent when the measured molecular weight falls below an acceptable value.
    Type: Application
    Filed: August 22, 2006
    Publication date: May 21, 2009
    Applicant: CASTROL LIMITED
    Inventors: Ross Mitchell Walker, Mitchell Gregory Wilson
  • Patent number: 7514393
    Abstract: A polyalkene dispersant comprised of low MW polyalkene having an average molecular weight range of about 300 to about 10,000 and an ethylenically-unsaturated, aliphatic or aromatic, nitrogen- and oxygen-containing graftable monomer and methods of making the same are disclosed. The monomers are formed by reacting an acylating agent with amines having one or more primary or secondary amine to form a reaction product. Graft polyalkene dispersants comprising such monomers are formed by grafting the reaction product to the polyalkene backbone. Also described is lubricating oil comprising base oil and the dispersant polyalkene as described above.
    Type: Grant
    Filed: November 8, 2004
    Date of Patent: April 7, 2009
    Assignee: Castrol Limited
    Inventor: Irwin L. Goldblatt
  • Patent number: 7371713
    Abstract: A graft copolymer containing one or more ethylenically-unsaturated, aliphatic or aromatic, nitrogen- and oxygen-containing graftable monomers grafted to a polyolefin is disclosed. Novel monomers, methods of making such monomers, and graft copolymers comprising such monomers are based on reacting an acylating agent with an amine to form a reaction product. The reaction product may include more than one chemical compound formed from the combination of the acylating agent and the amine. The monomer is the graftable, ethylenically unsaturated, aliphatic or aromatic, nitrogen- and oxygen-containing compound(s) of the reaction product. The monomer may, but need not, be recovered from the product mixture. The preferred monomer is the reaction product of maleic anhydride and 4-aminodiphenylamine. Also described is a method of making a dispersant viscosity index improver. The monomer of the present invention may be grafted to a polyolefin in solutions or melts.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: May 13, 2008
    Assignee: Castrol Limited
    Inventors: Irwin L. Goldblatt, Shean-Jer Chen, Manish R. Patel, Stephen T. McKenna
  • Patent number: D526203
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: August 8, 2006
    Assignee: Castrol Limited
    Inventor: Prabhat Mishra