Patents by Inventor Masashi Mitsuoka
Masashi Mitsuoka 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: 10041540Abstract: A grease composition which is excellent in seizure resistance can be provided without deteriorating resistance to stirring in the rolling device, and a rolling device in which the grease composition intervenes to a predetermined portion can be also provided by use of a grease composition comprising a base oil and a thickener, the thickener being a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, the amount of cyclohexylamine in the amine mixture being 80% by mole or more and less than 91% by mole, and a worked penetration being 300 to 330.Type: GrantFiled: March 22, 2013Date of Patent: August 7, 2018Assignees: JTEKT CORPORATION, NIPPON GREASE CO., LTD.Inventors: Koji Yoshizaki, Kensuke Suzuki, Hiroki Iwamatsu, Masashi Mitsuoka
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Publication number: 20150078687Abstract: A grease composition which is excellent in seizure resistance can be provided without deteriorating resistance to stirring in the rolling device, and a rolling device in which the grease composition intervenes to a predetermined portion can be also provided by use of a grease composition comprising a base oil and a thickener, the thickener being a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, the amount of cyclohexylamine in the amine mixture being 80% by mole or more and less than 91% by mole, and a worked penetration being 300 to 330.Type: ApplicationFiled: March 22, 2013Publication date: March 19, 2015Inventors: Koji Yoshizaki, Kensuke Suzuki, Hiroki Iwamatsu, Masashi Mitsuoka
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Patent number: 8951945Abstract: There is provided a rolling bearing which inhibits spalling of a rolling element and has a long service life even under rigorous environments. The rolling bearing comprises grease for lubricating rolling contact parts and/or sliding contact parts between a first raceway surface and a rolling elements and/or between a second raceway surface and a rolling elements, wherein the grease comprises a base oil, a thickener and an extreme pressure additive, the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole, and a reaction temperature of the extreme pressure additive with iron is 260° C. or lower.Type: GrantFiled: April 12, 2012Date of Patent: February 10, 2015Assignees: JTEKT Corporation, Nippon Grease Co., Ltd.Inventors: Koji Yoshizaki, Kunihiro Yamaguchi, Komatsugu Nishimura, Michiru Ueda, Hiroki Iwamatsu, Masashi Mitsuoka
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Publication number: 20150023622Abstract: A grease composition which is excellent in seizure resistance can be provided without deteriorating resistance to stirring, in the rolling device, and a rolling device in which the grease composition intervenes to a predetermined portion can be also provided by use of a grease composition comprising a base oil, a thickener and an amine antioxidant, the thickener being a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, the amount of cyclohexylamine in the amine mixture being 91 to 99% by mole, and the amount of the amine antioxidant in the grease composition being 21% by mass or more.Type: ApplicationFiled: March 22, 2013Publication date: January 22, 2015Inventors: Koji Yoshizaki, Kensuke Suzuki, Hiroki Iwamatsu, Masashi Mitsuoka
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Patent number: 8741823Abstract: There is provided a grease composition, in which a grease film on the surface of the applied part is made thicker compared with conventional grease compositions, this thickness is maintained for a long period of time, and as a result, a longer service life against seizure compared with conventional grease compositions is assured. The grease composition comprises a base oil and a thickener, wherein the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, and an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole.Type: GrantFiled: April 12, 2012Date of Patent: June 3, 2014Assignee: Nippon Grease Co., Ltd.Inventors: Hiroki Iwamatsu, Masashi Mitsuoka
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Publication number: 20120269472Abstract: There is provided a rolling bearing which inhibits spalling of a rolling element and has a long service life even under rigorous environments. The rolling bearing comprises grease for lubricating rolling contact parts and/or sliding contact parts between a first raceway surface and a rolling elements and/or between a second raceway surface and a rolling elements, wherein the grease comprises a base oil, a thickener and an extreme pressure additive, the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole, and a reaction temperature of the extreme pressure additive with iron is 260° C. or lower.Type: ApplicationFiled: April 12, 2012Publication date: October 25, 2012Applicants: NIPPON GREASE CO., LTD., JTEKT CORPORATIONInventors: Koji YOSHIZAKI, Kunihiro Yamaguchi, Komatsugu Nishimura, Michiru Ueda, Hiroki Iwamatsu, Masashi Mitsuoka
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Publication number: 20120270762Abstract: There is provided a grease composition, in which a grease film on the surface of the applied part is made thicker compared with conventional grease compositions, this thickness is maintained for a long period of time, and as a result, a longer service life against seizure compared with conventional grease compositions is assured. The grease composition comprises a base oil and a thickener, wherein the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, and an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole.Type: ApplicationFiled: April 12, 2012Publication date: October 25, 2012Applicant: NIPPON GREASE CO., LTD.Inventors: Hiroki IWAMATSU, Masashi Mitsuoka
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Patent number: 8044005Abstract: A rolling bearing, for use in household appliances, having a high degree of quietness, an excellent durability at high temperatures and rotational speeds, a low torque, and excellent fretting property; and a lubricant composition which can be sealed into the rolling bearing. The lubricant composition includes a base oil and a thickening agent. The base oil is a mixed oil having the following characteristics of (a) to (c): (a) The base oil consists essentially of a synthetic hydrocarbon oil and an ester oil; (b) A kinematic viscosity of the mixed oil at 40° C. is 40 to 70 mm2/second; (c) A mixing weight ratio between the ester oil of the mixed oil and the synthetic hydrocarbon oil thereof is 30:70 to 70:30. The thickening agent comprises a diurea compound shown by a formula (1): where R1 and R3 are a straight-chain alkyl groups having 9 to 22 carbon atoms respectively, and R2 is an aromatic hydrocarbon group having 6 to 15 carbon atoms. The lubricant composition is sealed into the rolling bearing.Type: GrantFiled: May 24, 2004Date of Patent: October 25, 2011Assignee: NTN CorporationInventors: Hidenobu Mikami, Seiji Okamura, Hiroki Iwamatsu, Masashi Mitsuoka
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Publication number: 20040242439Abstract: A rolling bearing, for use in household appliances, having a high degree of quietness, an excellent durability at high temperatures and rotational speeds, a low torque, and excellent fretting property; and a lubricant composition which can be sealed into the rolling bearing. The lubricant composition includes a base oil and a thickening agent. The base oil is a mixed oil having the following characteristics of (a) to (c): (a) The base oil consists essentially of a synthetic hydrocarbon oil and an ester oil; (b) A kinematic viscosity of the mixed oil at 40° C. is 40 to 70 mm2/second; (c) A mixing weight ratio between the ester oil of the mixed oil and the synthetic hydrocarbon oil thereof is 30:70 to 70:30.Type: ApplicationFiled: May 24, 2004Publication date: December 2, 2004Inventors: Hidenobu Mikami, Seiji Okamura, Hiroki Iwamatsu, Masashi Mitsuoka