Patents by Inventor Morikuni Nakazato
Morikuni Nakazato 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).
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Patent number: 9187706Abstract: A lubricating oil composition employable in combination with a low sulfur content fuel oil is preferably composed of a base oil having a sulfur content of at most 0.2 wt. %, an ashless dispersant comprising an alkenyl- or alkyl-succinimide or a derivative thereof, a metal-containing detergent containing an organic acid metal salt, a zinc dialkyldithiophosphate, a zinc dialkylaryldithiophosphate, and an oxidation inhibitor selected from the group consisting of a phenol compound, an amine compound, and a molybdenum-containing compound, wherein a ratio of the phosphorus content of the zinc dialkyldithiophosphate to the phosphorus content of the zinc dialkylaryldithiophosphate is in the range of 20:1 to 2:1.Type: GrantFiled: May 6, 2003Date of Patent: November 17, 2015Assignee: CHEVRONTEXACO CORPORATIONInventors: Satoshi Hirano, Shigeru Iwamoto, Morikuni Nakazato
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Publication number: 20150175929Abstract: Provided is a lubricating oil composition that is highly fuel-efficient and has high wear resistance and is particularly suited for lubrication of a motorcycle four-cycle gasoline engine or a diesel engine vehicle having an exhaust gas after-treatment device. The lubricating oil composition, which is a lubricating oil composition having an SAE viscosity grade of 5W20, comprises a base oil and predetermined amounts of additive components comprising of a nitrogen-containing ash-free dispersant, an alkali earth metal-containing detergent, a phosphorus-containing anti-wear agent, an antioxidant, and a viscosity index-improving agent, wherein the viscosity index is within a range of 140 to 230, the high-shear viscosity at 150° C. is 2.9 mPa·s or higher, and the NOACK evaporation loss is 13% or less.Type: ApplicationFiled: March 3, 2015Publication date: June 25, 2015Applicant: CHEVRON JAPAN LTDInventors: Hiroki Andoh, Morikuni Nakazato
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Patent number: 8784642Abstract: A lubricating oil composition of SAE viscosity grade 0W20 which comprises a base oil and additive components comprising a nitrogen-containing ashless dispersant, an alkaline earth metal-containing detergent, a phosphorus-containing wear inhibitor, an oxidation inhibitor and a viscosity index improver and which shows a viscosity index of 200-240, a HTHS viscosity of not less than 2.9 mPa·s s at 150° C. and a Noack evaporation loss of not more than 13% favorably gives a high fuel economy and high wear inhibition to a four cycle gasoline engine of motorcycles and a diesel engine mounted on motor cars equipped with an exhaust gas post-processing apparatus.Type: GrantFiled: November 11, 2011Date of Patent: July 22, 2014Assignee: Chevron Japan Ltd.Inventors: Hiroki Andoh, Morikuni Nakazato
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Publication number: 20130237465Abstract: Provided is a lubricating oil composition that is highly fuel-efficient and has high wear resistance and is particularly suited for lubrication of a motorcycle four-cycle gasoline engine or a diesel engine vehicle having an exhaust gas after-treatment device. The lubricating oil composition, which is a lubricating oil composition having an SAE viscosity grade of 5W20, comprises a base oil and predetermined amounts of additive components comprising of a nitrogen-containing ash-free dispersant, an alkali earth metal-containing detergent, a phosphorus-containing anti-wear agent, an antioxidant, and a viscosity index-improving agent, wherein the viscosity index is within a range of 140 to 230, the high-shear viscosity at 150° C. is 2.9 mPa·s or higher, and the NOACK evaporation loss is 13% or less.Type: ApplicationFiled: March 6, 2013Publication date: September 12, 2013Applicant: Chevron Japan LimitedInventors: Hiroki Andoh, Morikuni Nakazato
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Patent number: 8361940Abstract: A low sulfated ash, tow sulfur, low phosphorus, low zinc lubricating, oil composition preferably employable for internal combustion engines using a low sulfur hydrocarbon fuel comprises a base oil having a saturated component of 85 wt. % or more, a viscosity index of 110 or more, and a sulfur content of 0.01 wt. % or less; an alkaline earth metal-containing detergent; a nitrogen-containing ashless dispersant of a weight average molecular weight of 4,500 or more; a phenolic or amine oxidation inhibitor; and a basic nitrogen-containing compound-oxymolybdenum complex.Type: GrantFiled: September 12, 2007Date of Patent: January 29, 2013Assignee: Chevron Japan Ltd.Inventors: Morikuni Nakazato, Yoshitaka Takeuchi, Takahiro Muramatsu
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Publication number: 20120132166Abstract: A lubricating oil composition of SAE viscosity grade 0W20 which comprises a base oil and additive components comprising a nitrogen-containing ashless dispersant, an alkaline earth metal-containing detergent, a phosphorus-containing wear inhibitor, an oxidation inhibitor and a viscosity index improver and which shows a viscosity index of 200-240, a HTHS viscosity of not less than 2.9 mPa·s s at 150° C. and a Noack evaporation loss of not more than 13% favorably gives a high fuel economy and high wear inhibition to a four cycle gasoline engine of motorcycles and a diesel engine mounted on motor cars equipped with an exhaust gas post-processing apparatus.Type: ApplicationFiled: November 11, 2011Publication date: May 31, 2012Applicant: Chevron Japan Ltd.Inventors: Hiroki Andoh, Morikuni Nakazato
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Publication number: 20090005278Abstract: A lubricating oil composition for internal combustion engines comprising a base oil having and lubricating viscosity and additives composed of a) a salt of an alkali metal or alkaline earth metal and an alkylsalicylate and/or an alkylcarboxylate, b) a nitrogen atom-containing ashless dispersant and/or a nitrogen atom-containing dispersive viscosity index improver, c) a neutral salt of a fatty acid and a fatty amine, and d) oxidation inhibitor, is effective for lubricating diesel engines using a low sulfur-content fuel, even though it has a low sulfated ash content, a low sulfur content and a low phosphorus content.Type: ApplicationFiled: June 27, 2008Publication date: January 1, 2009Inventors: Yoshitake Takeuchi, Takahiro Muramatsu, Yoshito Yamashita, Morikuni Nakazato
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Publication number: 20080076686Abstract: A low sulfated ash, tow sulfur, low phosphorus, low zinc lubricating, oil composition preferably employable for internal combustion engines using a low sulfur hydrocarbon fuel comprises a base oil having a saturated component of 85 wt. % or more, a viscosity index of 110 or more, and a sulfur content of 0.01 wt. % or less; an alkaline earth metal-containing detergent; a nitrogen-containing ashless dispersant of a weight average molecular weight of 4,500 or more; a phenolic or amine oxidation inhibitor; and a basic nitrogen-containing compound-oxymolybdenum complex.Type: ApplicationFiled: September 12, 2007Publication date: March 27, 2008Inventors: Morikuni Nakazato, Yoshitaka Takeuchi, Takahiro Muramatsu
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Publication number: 20070184992Abstract: It has been discovered that a lubricating oil composition containing a certain combination of a nitrogen-containing dispersant and a metal-containing detergent of an alkali metal salt of alkylphenol derivative having a Mannich base structure, together with a phosphorus-containing organic compound, can be effectively employed in a method for improving the acrylic rubber sealant compatibility in an internal combustion engine, if the ratio of the nitrogen-containing dispersant and a metal-containing detergent of an alkali metal salt of alkylphenol derivative having a Mannich base structure is adjusted to a specific range, i.e., in the range of from 1:0.005 to 1:2 in terms of the nitrogen contents.Type: ApplicationFiled: December 20, 2006Publication date: August 9, 2007Inventors: Yoshitaka Takeuchi, Yoshito Yamashita, Morikuni Nakazato
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Publication number: 20030216266Abstract: A lubricating oil composition employable in combination with a low sulfur content fuel oil is preferably composed of a base oil having a sulfur content of at most 0.2 wt. %, an ashless dispersant comprising an alkenyl- or alkyl-succinimide or a derivative thereof, a metal-containing detergent containing an organic acid metal salt, a zinc dialkyldithiophosphate, a zinc dialkylaryldithiophosphate, and an oxidation inhibitor selected from the group consisting of a phenol compound, an amine compound, and a molybdenum-containing compound, wherein a ratio of the phosphorus content of the zinc dialkyldithiophosphate to the phosphorus content of the zinc dialkylaryldithiophosphate is in the range of 20:1 to 2:1.Type: ApplicationFiled: May 6, 2003Publication date: November 20, 2003Inventors: Satoshi Hirano, Shigeru Iwamoto, Morikuni Nakazato
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Patent number: 6569818Abstract: A lubricating oil composition having a low P content of 0.01 to 0.1 wt. %, and a sulfated ash of 0.1 to 1 wt. %, which is composed of a) a major amount of mineral base oil having a low S content of at most 0.1 wt. %; b) an ashless alkenyl or alkyl-succinimide dispersant; c) a metal-containing detergent (non-sulfurized alkali metal or alkaline earth metal salt of an alkylsalicylic acid and/or non-sulfurized alkali metal or alkaline earth metal salt of an alkylphenol derivative having a Mannich base structure); d) Zn-DTP; e) an oxidation inhibitor (phenol compound and/or amine compound) and wherein the sulfur content is 0.01 to 0.3 wt %. The lubricating oil composition shows good high temperature detergency notwithstanding its low S, P, and sulfated ash content, and is favorably employable in diesel engines using fuel of an extremely low sulfur content.Type: GrantFiled: May 30, 2001Date of Patent: May 27, 2003Assignee: Chevron Oronite Company, LLCInventors: Morikuni Nakazato, Shigeru Iwamoto, Satoshi Hirano
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Patent number: 6531428Abstract: A low phosphorous lubricating oil composition for internal combustion engines comprising an alkylthiocarbamate compound of the formula: wherein each of R1, R2, R3, and R4 independently represents an alkyl group of 1-18 carbon atoms, and (X) represents S, S—S, S—CH2—S, S—CH2CH2—S, S—CH2CH2CH2—S, or S—CH2CH(CH3)—S, and additive compositions and additive packages utilizing the above compound.Type: GrantFiled: April 4, 1994Date of Patent: March 11, 2003Assignee: Chevron Oronite Company LLCInventors: Morikuni Nakazato, Jiro Magarifuchi, Akihiro Mochizuki, Hiroshi Tanabe
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Publication number: 20020098990Abstract: A low phosphorous lubricating oil composition for internal combustion engines comprising an alkylthiocarbamate compound of the formula: 1Type: ApplicationFiled: April 4, 1994Publication date: July 25, 2002Inventors: MORIKUNI NAKAZATO, JIRO MAGARIFUCHI, AKIHIRO MOCHIZUKI, HIROSHI TANABE
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Publication number: 20020019320Abstract: A lubricating oil composition having a low P content of 0.01 to 0.1 wt. %, and a sulfated ash of 0.1 to 1 wt. %, which is composed of a) a major amount of mineral base oil having a low S content of at most 0.1 wt. %; b) an ashless alkenyl or alkyl-succinimide dispersant; c) a metal-containing detergent (non-sulfurized alkali metal or alkaline earth metal salt of an alkylsalicylic acid and/or non-sulfurized alkali metal or alkaline earth metal salt of an alkylphenol derivative having a Mannich base structure); d) Zn-DTP; e) an oxidation inhibitor (phenol compound and/or amine compound) and wherein the sulfur content is 0.01 to 0.3 wt %. The lubricating oil composition shows good high temperature detergency notwithstanding its low S, P, and sulfated ash content, and is favorably employable in diesel engines using fuel of an extremely low sulfur content.Type: ApplicationFiled: May 30, 2001Publication date: February 14, 2002Inventors: Morikuni Nakazato, Shigeru Iwamoto, Satoshi Hirano
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Patent number: 5629272Abstract: An engine oil composition which comprises a metal-containing detergent, zinc dithiophosphate, and a boron-containing ashless dispersant dissolved or dispersed in a base oil; characterized by further containing an antiwear agent having an aliphatic amide compound and either a dithiocarbamate compound or an ester derived from a fatty acid and boric acid.Type: GrantFiled: December 3, 1993Date of Patent: May 13, 1997Assignee: Oronite Japan LimitedInventors: Morikuni Nakazato, Jiro Magarifuchi, Yoshifumi Isozaki
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Patent number: 5569405Abstract: An engine oil composition having a base oil, an ashless dispersant, a metal-containing detergent, zinc dithiophosphate and a sulfur-containing phenol derivative. Examples of sulfur-containing phenol derivative include 2,4-bis{(octylthio)methyl}-o-cresol, 2,2-thiodiethylenebis{3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate}, and tridecyl 2-(3,5-di-ti-butyl-4-hydroxybenzylthio)acetate.Type: GrantFiled: August 27, 1993Date of Patent: October 29, 1996Assignee: Chevron Chemical CompanyInventors: Morikuni Nakazato, Takahiro Muramatsu, Shigeru Iwamoto
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Patent number: 4530771Abstract: A lubricating oil composition containing esters constituted with glycerol, fatty acid and boric acid, which esters having carboxylic acid residue, glycerol residue and boric acid residue at a specific proportion.The proportion for the carboxylic acid residue and glycerol residue ranges 0-2.0 mols and 1.5-2.0 mols respectively per unit mol of a boric acid residue, and the glycerol residue is 1.2 mols or more based on 1 mol of the carboxylic acid residue.Lubricating oil additives according to the invention have almost no corrosion property in bearing portions, and do not form any solid film on themselves when allowed to stand in the air.Type: GrantFiled: July 26, 1983Date of Patent: July 23, 1985Assignee: Karonite Chemical Co., Ltd.Inventors: Takaharu Nakano, Akihiro Mochizuki, Morikuni Nakazato, Tatsuro Tsuneno