Patents by Inventor Michita Hokao
Michita Hokao 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: 10920163Abstract: The invention provides a grease composition for lubricating resins which contains a base oil, a diurea compound represented by formula (I) as a thickener: R1—NHCONH—R2—NHCONH—R3 (I) (wherein R2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 each independently represent a straight-chain or branched alkyl group having 8 to 22 carbon atoms), and a chained hydrocarbon polymer having a weight-average molecular weight of 20,000 to 300,000.Type: GrantFiled: December 28, 2015Date of Patent: February 16, 2021Assignees: KYODO YUSHI CO., LTD., NSK LTD.Inventors: Iwaki Hirooka, Haruhiko Kiyota, Takeshi Yamamoto, Michita Hokao
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Publication number: 20170362530Abstract: The invention provides a grease composition for lubricating resins which contains a base oil, a diurea compound represented by formula (I) as a thickener: R1—NHCONH —R2—NHCONH—R3 (I) (wherein R2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 each independently represent a straight-chain or branched alkyl group having 8 to 22 carbon atoms), and a chained hydrocarbon polymer having a weight-average molecular weight of 20,000 to 300,000.Type: ApplicationFiled: December 28, 2015Publication date: December 21, 2017Applicants: KYODO YUSHI CO., LTD., NSK Ltd.Inventors: Iwaki HIROOKA, Haruhiko KIYOTA, Takeshi YAMAMOTO, Michita HOKAO
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Publication number: 20150330451Abstract: A rolling bearing including a plurality of rolling elements rollably provided between an inner ring and an outer ring and having enclosed therein a grease composition obtained by adding three kinds of antirust agents which are a carboxylic acid-based antirust agent, a carboxylate-based antirust agent and an amine-based antirust agent, to a base oil which contains at least one kind of a mineral oil and a synthetic oil and has a kinematic viscosity of 200 to 400 mm2/s at 40° C., the grease composition having a penetration of 300 to 400 and a yield stress of 150 Pa or less at 40° C.Type: ApplicationFiled: December 27, 2012Publication date: November 19, 2015Applicants: KYODO YUSHI CO., LTD., NSK LTD.Inventors: Noriyuki INAMI, Haruka KANDA, Michita HOKAO, Atsushi YOKOUCHI, Shinya NAKATANI
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Publication number: 20150307805Abstract: A grease-enclosed bearing having enclosed therein a grease composition containing a thickener which is a diurea compound represented by Formula (1) or a mixture thereof, and a base oil containing an alkyldiphenyl ether oil and a poly-?-olefin oil as an optional component in a mass ratio of alkyldiphenyl ether oil:poly-?-olefin oil=from 40:60 to 100:0: R1-NHCONH—R2-NHCONH—R3??Formula (1) wherein at least either one of R1 and R3 is an aromatic hydrocarbon group having a carbon number of 6 to 12, the other one is an aromatic hydrocarbon group having a carbon number of 6 to 12 or an aliphatic hydrocarbon group having a carbon number of 6 to 20, and R2 is an aromatic hydrocarbon group having a carbon number of 6 to 15.Type: ApplicationFiled: December 2, 2013Publication date: October 29, 2015Applicants: KYODO YUSHI CO., LTD., NSK LTD.Inventors: Haruka KANDA, Noriyuki INAMI, Michita HOKAO, Atsushi YOKOUCHI, Katsuhiro KONNO
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Publication number: 20140199009Abstract: The present invention relates to: a grease composition that includes a base oil which has a pressure-viscosity coefficient as measured at 40° C. of 33 GPa?1 or less and a thickener which is contained in a projected-area proportion of 10% by area or higher; and a rolling device packed with the grease composition.Type: ApplicationFiled: August 24, 2012Publication date: July 17, 2014Applicant: NSK LTD.Inventors: Noriyuki Inami, Atsushi Yokouchi, Michita Hokao, Shinya Nakatani, Haruka Kanda, Kazuhiro Soga, Takayuki Miyagawa
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Patent number: 7196042Abstract: A grease composition is produced by mixing a thickener comprising a fluoro resin and a second thickener component (a metallic soap, a complex metallic soap, an N-substituted terephthalamic acid metal salt, organic bentonite or a calcium sulfonate complex) into a base oil. This grease composition is excellent in heat resistance, load carring capacity, water resistance, rust protection, lubricating life and the like. A rolling apparatus filled with the above grease composition has excellent lubricating ability and is long-lived under high-temperature conditions. Moreover, a grease composition is produced by mixing a thickener comprising a fluoro resin and carbon black as a second thickener component into a base oil. This grease composition is excellent in heat resistance, water resistance, rust protection, lubricating life, electric conductivity and the like. A rolling apparatus filled with the above grease composition has excellent electric conductivity and is long-lived under high-temperature conditions.Type: GrantFiled: March 4, 2003Date of Patent: March 27, 2007Assignee: NSK Ltd.Inventors: Shinya Nakatani, Yasunobu Fujita, Michita Hokao, Hirotoshi Miyajima
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Publication number: 20050221999Abstract: A grease composition is produced by mixing a thickener comprising a fluoro resin and a second thickener component (a metallic soap, a complex metallic soap, an N-substituted terephthalamic acid metal salt, organic bentonite or a calcium sulfonate complex) into a base oil. This grease composition is excellent in heat resistance, load carrying capacity, water resistance, rust protection, lubricating life and the like. A rolling apparatus filled with the above grease composition has excellent lubricating ability and is long-lived under high-temperature conditions. Moreover, a grease composition is produced by mixing a thickener comprising a fluoro resin and carbon black as a second thickener component into a base oil. This grease composition is excellent in heat resistance, water resistance, rust protection, lubricating life, electric conductivity and the like. A rolling apparatus filled with the above grease composition has excellent electric conductivity and is long-lived under high-temperature conditions.Type: ApplicationFiled: May 25, 2005Publication date: October 6, 2005Applicant: NSK Ltd.Inventors: Shinya Nakatani, Yasunobu Fujita, Michita Hokao, Hirotoshi Miyajima
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Publication number: 20050221997Abstract: A grease composition is produced by mixing a thickener comprising a fluoro resin and a second thickener component (a metallic soap, a complex metallic soap, an N-substituted terephthalamic acid metal salt, organic bentonite or a calcium sulfonate complex) into a base oil. This grease composition is excellent in heat resistance, load carrying capacity, water resistance, rust protection, lubricating life and the like. A rolling apparatus filled with the above grease composition has excellent lubricating ability and is long-lived under high-temperature conditions. Moreover, a grease composition is produced by mixing a thickener comprising a fluoro resin and carbon black as a second thickener component into a base oil. This grease composition is excellent in heat resistance, water resistance, rust protection, lubricating life, electric conductivity and the like. A rolling apparatus filled with the above grease composition has excellent electric conductivity and is long-lived under high-temperature conditions.Type: ApplicationFiled: May 25, 2005Publication date: October 6, 2005Applicant: NSK Ltd.Inventors: Shinya Nakatani, Yasunobu Fujita, Michita Hokao, Hirotoshi Miyajima
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Publication number: 20050221996Abstract: A grease composition is produced by mixing a thickener comprising a fluoro resin and a second thickener component (a metallic soap, a complex metallic soap, an N-substituted terephthalamic acid metal salt, organic bentonite or a calcium sulfonate complex) into a base oil. This grease composition is excellent in heat resistance, load carrying capacity, water resistance, rust protection, lubricating life and the like. A rolling apparatus filled with the above grease composition has excellent lubricating ability and is long-lived under high-temperature conditions. Moreover, a grease composition is produced by mixing a thickener comprising a fluoro resin and carbon black as a second thickener component into a base oil. This grease composition is excellent in heat resistance, water resistance, rust protection, lubricating life, electric conductivity and the like. A rolling apparatus filled with the above grease composition has excellent electric conductivity and is long-lived under high-temperature conditions.Type: ApplicationFiled: May 25, 2005Publication date: October 6, 2005Applicant: NSK Ltd.Inventors: Shinya Nakatani, Yasunobu Fujita, Michita Hokao, Hirotoshi Miyajima
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Patent number: 6919301Abstract: A grease composition with a thickener of a calcium sulfonate complex and a second thickener component in a base oil. The second thickener component may be, for instance, polyurea, a metallic soap, a complex metallic soap or an N-substituted terephthalamic acid metal salt. Alternatively, a grease composition with a thickener of an N-substituted terephthalamic acid metal salt and a second thickener component in a base oil. Furthermore, a grease composition with a thickener component of polyurea and complex metallic soap in an ester oil. Still further, a grease composition with a thickener of polyurea and a complex metallic soap in a base oil.Type: GrantFiled: October 15, 2002Date of Patent: July 19, 2005Assignee: NSK Ltd.Inventors: Shinya Nakatani, Hirotoshi Miyazima, Michita Hokao
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Publication number: 20040186025Abstract: A grease composition is produced by mixing a thickener comprising a fluoro resin and a second thickener component (a metallic soap, a complex metallic soap, an N-substituted terephthalamic acid metal salt, organic bentonite or a calcium sulfonate complex) into a base oil. This grease composition is excellent in heat resistance, load carring capacity, water resistance, rust protection, lubricating life and the like.Type: ApplicationFiled: March 4, 2003Publication date: September 23, 2004Applicant: NSK Ltd.Inventors: Shinya Nakatani, Yasunobu Fujita, Michita Hokao, Hirotoshi Miyajima
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Patent number: 6652149Abstract: In a rolling bearing, a plurality of rolling elements are rollably retained by a retainer between an inner ring and an outer ring, while being substantially equidistantly arranged. The rolling bearing is filled with a grease composition which contains a base oil including of fluorocarbon polymer oil, and a thickening agent including a polytetrafluoroethylene. A conductive material is added in an amount of 0.1 to 10 wt %, based on the total weight of the grease composition, to the grease composition.Type: GrantFiled: February 19, 2002Date of Patent: November 25, 2003Assignee: NSK Ltd.Inventors: Michita Hokao, Kenichi Iso
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Publication number: 20030176298Abstract: A grease composition is produced by mixing a thickener of a calcium sulfonate complex and a second thickener component (polyurea, a metallic soap, a complex metallic soap or an N-substituted terephthalamic acid metal salt) into a base oil. This grease composition is excellent in heat resistance, load carrying capacity, water resistance and lubricating life.Type: ApplicationFiled: October 15, 2002Publication date: September 18, 2003Applicant: NSK Ltd.Inventors: Shinya Nakatani, Hirotoshi Miyazima, Michita Hokao
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Publication number: 20020159662Abstract: In a rolling bearing, a plurality of rolling elements are rollably retained by a retainer between an inner ring and an outer ring, while being substantially equidistantly arranged. The rolling bearing is filled with a grease composition which contains a base oil including of fluorocarbon polymer oil, and a thickening agent including a polytetrafluoroethylene. A conductive material is added in an amount of 0.1 to 10 wt %, based on the total weight of the grease composition, to the grease composition.Type: ApplicationFiled: February 19, 2002Publication date: October 31, 2002Applicant: NSK LTD.Inventors: Michita Hokao, Kenichi Iso