Patents by Inventor Takumaru Sagawa
Takumaru Sagawa 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: 9677611Abstract: A low friction assembly is desired. The present invention relates to a new low-friction lubrication assembly comprising a first member relatively slidable against a second member, the first member having chemical affinity with an OH-group on its sliding surface; and one or more oxygen containing compounds, provided on the sliding surface of the first member and being able to produce a tribofilm attached to the sliding surface of the first member through hydrogen bond interactions. Preferably the second member comprises a similar OH-terminated sliding surface wherein an oxygen containing compound (lubricant)-supported interface between the first and second sliding surfaces results in a H- and/or OH-terminated interface developing repulsive forces thereinbetween.Type: GrantFiled: March 12, 2013Date of Patent: June 13, 2017Assignees: NISSAN MOTOR CO., LTD.Inventors: Jean Michel Martin, Makoto Kano, Takumaru Sagawa, Masahiko Watanabe, Yutaka Mabuchi
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Patent number: 8901052Abstract: A transmission oil composition for an automobile characterized in that it contains a base oil selected from the group consisting of a mineral oil, a synthetic oil and mixtures thereof; and a phosphate compound selected from the group consisting of (A) a zinc dithiophosphate having a hydrocarbon group, (B) a triaryl phosphate (C) a triaryl thiophosphate, and mixtures thereof at 0.1 to 15.0% by mass with respect to the total composition; wherein the composition has a volume resistivity of 1×107 ohm·m or more at 80° C.Type: GrantFiled: December 29, 2010Date of Patent: December 2, 2014Assignees: Nissan Motor Co., Ltd., Nippon Oil CorporationInventors: Takumaru Sagawa, Takafumi Ueno, Hisayuki Wada, Tooru Aoki
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Publication number: 20130190216Abstract: [Object] A low friction assembly is desired. [Solving Means] The present invention relates to a new low-friction lubrication assembly comprising a first member relatively slidable against a second member, the first member having chemical affinity with an OH-group on its sliding surface; and one or more oxygen containing compounds, provided on the sliding surface of the first member and being able to produce a tribofilm attached to the sliding surface of the first member through hydrogen bond interactions. Preferably the second member comprises a similar OH-terminated sliding surface wherein an oxygen containing compound (lubricant)-supported interface between the first and second sliding surfaces results in a H- and/or OH-terminated interface developing repulsive forces thereinbetween.Type: ApplicationFiled: March 12, 2013Publication date: July 25, 2013Inventors: Jean Michel MARTIN, Makoto KANO, Takumaru SAGAWA, Masahiko WATANABE, Yutaka MABUCHI
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Patent number: 8422339Abstract: [Object] A low friction assembly is desired. [Solving Means] The present invention relates to a new low-friction lubrication assembly comprising a first member relatively slidable against a second member, the first member having chemical affinity with an OH-group on its sliding surface; and one or more oxygen containing compounds, provided on the sliding surface of the first member and being able to produce a tribofilm attached to the sliding surface of the first member through hydrogen bond interactions. Preferably the second member comprises a similar OH-terminated sliding surface wherein an oxygen containing compound (lubricant)-supported interface between the first and second sliding surfaces results in a H- and/or OH-terminated interface developing repulsive forces thereinbetween.Type: GrantFiled: April 27, 2007Date of Patent: April 16, 2013Assignees: Nissan Motor Co., Ltd.Inventors: Jean Michel Martin, Makoto Kano, Takumaru Sagawa, Masahiko Watanabe, Yutaka Mabuchi
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Publication number: 20110092402Abstract: A transmission oil composition for an automobile characterized in that it contains a base oil selected from the group consisting of a mineral oil, a synthetic oil and mixtures thereof; and a phosphate compound selected from the group consisting of (A) a zinc dithiophosphate having a hydrocarbon group, (B) a triaryl phosphate (C) a triaryl thiophosphate, and mixtures thereof at 0.1 to 15.0% by mass with respect to the total composition; wherein the composition has a volume resistivity of 1×107 ohm·m or more at 80° C.Type: ApplicationFiled: December 29, 2010Publication date: April 21, 2011Inventors: Takumaru Sagawa, Takafumi Ueno, Hisayuki Wada, Tooru Aoki
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Patent number: 7607414Abstract: A member for an internal combustion engine, such as a piston, a valve and a fuel injection valve. The member includes a substrate. A carbon-based coating film is formed on the substrate to cover at least a part of a region of the substrate to which region fuel for the internal combustion engine is contactable. The carbon-based coating film contains fluorine and has a thickness of 10 ?m or less.Type: GrantFiled: September 13, 2005Date of Patent: October 27, 2009Assignee: Nissan Motor Co., Ltd.Inventors: Seiji Kamada, Hiroshi Kumagai, Midori Kondou, Kenji Kikuchi, Takumaru Sagawa, Yutaka Mabuchi, Takahiro Nakahigashi
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Publication number: 20090186783Abstract: [Object] A low friction assembly is desired. [Solving Means] The present invention relates to a new low-friction lubrication assembly comprising a first member relatively slidable against a second member, the first member having chemical affinity with an OH-group on its sliding surface; and one or more oxygen containing compounds, provided on the sliding surface of the first member and being able to produce a tribofilm attached to the sliding surface of the first member through hydrogen bond interactions. Preferably the second member comprises a similar OH-terminated sliding surface wherein an oxygen containing compound (lubricant)-supported interface between the first and second sliding surfaces results in a H- and/or OH-terminated interface developing repulsive forces thereinbetween.Type: ApplicationFiled: April 27, 2007Publication date: July 23, 2009Applicants: NISSAN MOTOR CO., LTD.Inventors: Jean Michel Martin, Makoto Kano, Takumaru Sagawa, Masahiko Watanabe, Yutaka Mabuchi
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Publication number: 20090118148Abstract: [Summary] [Object] To provide a low-friction sliding mechanism capable of exhibiting an extremely excellent ultra-low friction characteristics at a sliding face existing in a variety of uses. [Solving means] A low-friction sliding mechanism is constituted by disposing a lubricant containing glycerol, at a sliding face formed between sliding members which have respectively hard carbon thin films. A low-friction sliding mechanism is constituted by disposing a lubricant containing hydroxyl group, at a sliding face formed between sliding members which have respectively hard carbon thin films, wherein a friction coefficient of smaller than 0.02 is exhibited in a sliding contacting condition under a boundary lubrication which exhibits a friction coefficient of 0.1 to 0.14 at a sliding face between a steel and a steel in presence of an engine oil. Each hard carbon thin film is formed of a-C or ta-C. Each hard carbon thin film has a hardness of 1500 to 5000 Hv in micro-Vickers hardness under a load of 10 g.Type: ApplicationFiled: April 2, 2007Publication date: May 7, 2009Inventors: Jean Michel Martin, Makoto Kano, Takumaru Sagawa, Masahiko Watanabe
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Publication number: 20080058233Abstract: A transmission oil composition for an automobile characterized in that it contains a base oil selected from the group consisting of a mineral oil, a synthetic oil and mixtures thereof; and a phosphate compound selected from the group consisting of (A) a zinc dithiophosphate having a hydrocarbon group, (B) a triaryl phosphate (C) a triaryl thiophosphate, and mixtures thereof at 0.1 to 15.0% by mass with respect to the total composition; wherein the composition has a volume resistivity of 1×107 ohm·m or more at 80° C.Type: ApplicationFiled: October 24, 2007Publication date: March 6, 2008Applicants: NISSAN MOTOR CO., LTD., NIPPON OIL CORPORATIONInventors: Takumaru Sagawa, Takafumi Ueno, Hisayuki Wada, Tooru Aoki
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Patent number: 7307048Abstract: A transmission oil composition for an automobile characterized in that it contains a base oil selected from the group consisting of a mineral oil, a synthetic oil and mixtures thereof; and a phosphate compound selected from the group consisting of (A) a zinc dithiophosphate having a hydrocarbon group, (B) a triaryl phosphate (C) a triaryl thiophosphate, and mixtures thereof at 0.1 to 15.0% by mass with respect to the total composition; wherein the composition has a volume resistivity of 1×107 ohm·m or more at 80° C.Type: GrantFiled: May 28, 2002Date of Patent: December 11, 2007Assignees: Nissan Motor Co., Ltd., Nippon Oil CorporationInventors: Takumaru Sagawa, Takafumi Ueno, Hisayuki Wada, Tooru Aoki
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Publication number: 20060054127Abstract: A member for an internal combustion engine, such as a piston, a valve and a fuel injection valve. The member includes a substrate. A carbon-based coating film is formed on the substrate to cover at least a part of a region of the substrate to which region fuel for the internal combustion engine is contactable. The carbon-based coating film contains fluorine and has a thickness of 10 ?m or less.Type: ApplicationFiled: September 13, 2005Publication date: March 16, 2006Inventors: Seiji Kamada, Hiroshi Kumagai, Midori Kondou, Kenji Kikuchi, Takumaru Sagawa, Yutaka Mabuchi, Takahiro Nakahigashi
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Publication number: 20040209786Abstract: A transmission oil composition for an automobile characterized in that it contains a base oil selected from the group consisting of a mineral oil, a synthetic oil and mixtures thereof; and a phosphate compound selected from the group consisting of (A) a zinc dithiophosphate having a hydrocarbon group, (B) a triaryl phosphate (C) a triaryl thiophosphate, and mixtures thereof at 0.1 to 15.0% by mass with respect to the total composition; wherein the composition has a volume resistivity of 1×107 ohm·m or more at 80° C.Type: ApplicationFiled: February 11, 2004Publication date: October 21, 2004Inventors: Takumaru Sagawa, Takafumi Ueno, Hisayuki Wada, Tooru Aoki