Patents by Inventor Takayuki Kawamura
Takayuki Kawamura 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: 8946134Abstract: The present invention provides a grease composition or a lubricating oil composition which is capable of effectively preventing hydrogen brittleness-caused peeling from occurring on a rolling surface of a rolling bearing, is excellent in durability in a high temperature and speed operation, and can be used for a long time. A grease-packed bearing (1) has an inner ring (2), an outer ring (3), and a plurality of rolling elements (4). A sealing member (6) for sealing a grease composition (7) is provided at openings (8a) and (8b) disposed at both axial ends of the inner ring (2) and the outer ring (3). The grease composition (7) includes a base grease composed of a base oil and a thickener and an additive added to the base grease. The additive contains at least one compound selected from among plant-derived polyphenolic compounds and compounds formed by decomposition thereof.Type: GrantFiled: February 24, 2010Date of Patent: February 3, 2015Assignee: NTN CorporationInventors: Hidenobu Mikami, Yosuke Taguchi, Takayuki Kawamura
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Patent number: 8673829Abstract: It is an object of the present invention to provide a grease composition (7) which can be used for a long term in a wide temperature range from low to high temperatures by using comparatively inexpensive base oil. It is another object of the present invention to provide a rolling bearing and a universal joint in which the grease composition (7) is enclosed. The grease composition (7) is composed of base grease, consisting of base oil and a thickener, to which an additive is added. The base oil contains not less than 50 wt % of highly refined oil having a viscosity index of 120 to 180. The additive contains at least ZnDTP and 0.2 to 6 parts by weight of poly (metha) acrylate having a kinematic viscosity of not less than 100 mm2/s and less than 850 mm2/s at 100° C. for 100 parts by weight of the base grease. The grease composition (7) is enclosed in the circumferences of rolling elements (4) of a rolling bearing (1).Type: GrantFiled: September 3, 2009Date of Patent: March 18, 2014Assignee: NTN CorporationInventor: Takayuki Kawamura
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Patent number: 8632233Abstract: A vehicle lighting device is provided which is capable of merely changing a shade, thereby using a first reflector and a second reflector as they are, to cope with a variety of light distribution pattern specifications, and which is capable of avoiding deformation of a shade due to a thermal effect even if incidence of sunlight going back has optically focused on the shade. In a heat sink member 40, there are arranged: a semiconductor-type light source 10; a first reflector 21 covering the semiconductor-type light source 10 therewith; a second reflector 22 for causing the reflected light from the first reflector 21 so as to be made incident thereto and then reflecting the incident light forward of the lighting device; and a shade 30 for shading a part of the reflected light from the first reflector 21 so as to be made incident to the second reflector 22. The shade 30 is configured as another member independent of the first and second reflectors 21, 22, and is arranged in the heat sink 40.Type: GrantFiled: February 24, 2011Date of Patent: January 21, 2014Assignee: Ichikoh Industries, Ltd.Inventor: Takayuki Kawamura
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Patent number: 8629090Abstract: The present invention provides a rust resisting grease composition showing an excellent rust resisting performance without using nitrites and the grease composition-enclosed bearing. The rust resisting grease composition contains a base oil, a thickener, and a rust resisting component. The rust resisting component contains a metallic salt of a polybasic acid, a polyvalent alcohol in which a part of a hydroxyl group is blocked, and at least one compound selected from an organic sulfonate and a fatty ester. The content of the component is 0.1 to 10 parts by weight based on the total amount of the base oil and the thickener. The base oil contains at least one oil selected from synthetic hydrocarbon oil and ether oil. The thickener is a urea thickener. The content of the thickener is 5 to 30 parts by weight based on the total amount of the base oil and the thickener.Type: GrantFiled: March 25, 2005Date of Patent: January 14, 2014Assignee: NTN CorporationInventor: Takayuki Kawamura
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Patent number: 8622785Abstract: A method of turning the surface of a die, which is used to make a product, into an antireflective roughened one includes the steps of: a) producing a first roughness on the surface of the die; and b) producing a second roughness, which is smaller than the first roughness, on the surface of the die on which the first roughness has already been produced.Type: GrantFiled: June 16, 2010Date of Patent: January 7, 2014Assignee: Panasonic CorporationInventors: Koichiro Hirabayashi, Tetsuya Uno, Kazutake Boku, Takayuki Kawamura
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Patent number: 8609598Abstract: The present invention relates to a nitrite free grease composition having an oil base, a thickener, and several additives, including a metal salt of dibasic acid. The metal salt having sub-groups that can either be aliphatic or aromatic hydrocarbons. Additionally, the present invention relates to a grease-sealed bearing with a longer lifetime and excellent rust preventative properties.Type: GrantFiled: July 21, 2003Date of Patent: December 17, 2013Assignee: NTN CorporationInventors: Hidenobu Mikami, Takayuki Kawamura, Mitsunari Asao, Eiichirou Shimazu
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Publication number: 20130276563Abstract: The present invention provides a grease composition which contains a small amount (not more than 0.06 wt %) of molybdenum and yet is capable of achieving an excellent low friction property when mechanical parts in which the grease composition has been packed are operated under a severe sliding condition in which they are subjected to a high speed and a high contact pressure. The present invention also provides a bearing, a universal joint, and a linear motion device in which the grease composition of the present invention is packed. A grease composition (7) is packed inside a grease-packed bearing (1) in such a way that the grease composition (7) is applied to at least the circumference of each rolling element (4). The grease composition (7) contains base oil, a thickener, and an additive. The additive includes molybdenum dithiocarbamate and sodium dithiocarbamate. The content of the molybdenum for the whole weight of the grease composition (7) is set to not more than 0.06 wt %.Type: ApplicationFiled: December 16, 2011Publication date: October 24, 2013Applicant: NTN CORPORATIONInventors: Takayuki Kawamura, Mitsunari Asao
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Patent number: 8414171Abstract: A periphery of a projecting lens is heated due to radiation heat exerted by light emitted from a light source, like peripheries of the light source and a reflector. However, a lens holder holding the projecting lens is integrally molded with a heat sink member, so that a heat at the periphery of the projecting lens is well transmitted to the heat sink member by means of the lens holder, and is efficiently radiated by means of the heat sink member.Type: GrantFiled: September 10, 2009Date of Patent: April 9, 2013Assignee: Ichikoh Industries, Ltd.Inventor: Takayuki Kawamura
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Publication number: 20120316091Abstract: The present invention provides a thickener which allows grease having an excellent durability in a high-temperature and high-speed condition to be produced, the grease containing the thickener, a method of producing the thickener and the grease, and a grease-packed bearing. A grease (7) to be packed in a bearing (1) is obtained by adding a thickener for a grease comprising a compound shown by a chemical formula (1) shown below or a compound shown by a chemical formula (2) shown below; In the chemical formula (1) or the chemical formula (2), R1 shows a diamine residue or a diisocyanate residue; R2 shows a residue of a dicarboxylic acid in which two adjacent carbon atoms form an imide ring or residues of derivative of the dicarboxylic acid; R3 shows a tetracarboxylic acid residue or residues of derivatives of the tetracarboxylic acid; R4 shows a hydrogen atom residue, a monoamine residue or a monoisocyanate residue; and n indicates integers of 0 through 5.Type: ApplicationFiled: February 18, 2011Publication date: December 13, 2012Applicant: NTN CORPORATIONInventor: Takayuki Kawamura
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Patent number: 8329623Abstract: The present invention provides a grease composition (7) which has a low friction and a low viscosity and is durable at a high temperature and a grease-sealed bearing (1) in which the grease composition is enclosed. The grease composition contains base oil, a thickener, and an additive. The base oil contains an ionic liquid consisting of a cation component and an anion component. The additive contains a corrosion inhibitor such as nitrites, molybdates or dibasic acid salts. The thickener is fluorine resin such as polytetrafluoroethylene. The grease composition (7) is applied to a periphery of each rolling element (4) of the grease-sealed bearing (1).Type: GrantFiled: March 31, 2009Date of Patent: December 11, 2012Assignee: NTN CorporationInventor: Takayuki Kawamura
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Publication number: 20120277132Abstract: A lubricant composition capable of effectively preventing a rolling surface of a bearing from flaking owing to hydrogen embrittlement. The bearing is lubricated with the lubricant composition. The lubricant composition is lubricating oil or grease. The lubricant composition contains a molybdate. The lubricant composition also contains an organic acid salt. At least one molybdate is selected from sodium molybdate, potassium molybdate, and lithium molybdate. The organic acid salt is a sodium salt of an organic acid having one to 20 carbon atoms. 0.01 to 5 wt % of the molybdate is added to the entirety of the lubricant composition. 5 wt % to 70 wt % of the organic acid salt is added to the addition amount of the molybdate. The lubricant composition forms a film containing a molybdenum compound in addition to an iron oxide film on a worn surface of the bearing.Type: ApplicationFiled: April 30, 2012Publication date: November 1, 2012Applicant: NTN CORPORATIONInventors: Mika Kohara, Takayuki Kawamura, Kenji Tamada
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Patent number: 8280421Abstract: A terminal device free of interference between an RACH and a PUSCH or the like even when a base station device with a large coverage is installed. In the device, a configuration number extraction unit (103) extracts a configuration number from a BCH received by a BCH reception unit (102). A control unit (104) determines the corresponding RACH format (the necessity of repetition, the CP length TCP, the second preamble length TPRE2, and the GT length TGT) according to the configuration number, notifies a repetition unit (109) of the result of the judgment of necessity of repetition, notifies the repetition unit (109) of the second preamble length TPRE2, notifies a CP addition unit (110) of the CP length TCP, and notifies a GT addition unit (112) of the GT length TGT. When the repetition unit (109) receives the notification of performing the repetition, it performs the repetition according to the second preamble length received from a TPRE2 determination section (154).Type: GrantFiled: August 8, 2008Date of Patent: October 2, 2012Assignee: Panasonic CorporationInventors: Masahiko Nanri, Tsutomu Onuki, Takayuki Kawamura
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Patent number: 8188016Abstract: A lubricant composition capable of preventing a rolling surface of a bearing from flaking owing to hydrogen embrittlement. The bearing is lubricated with the lubricant composition which is a lubricating oil or grease. The lubricant composition contains a molybdate and an organic acid salt. At least one molybdate is selected from sodium molybdate, potassium molybdate, and lithium molybdate. The organic acid salt is a sodium salt of an organic acid having one to 20 carbon atoms. The lubricant composition forms a film containing a molybdenum compound in addition to an iron oxide film on a worn surface of the bearing or on a fresh surface of an iron-based metal generated by wear. The bearing is used as a rolling bearing for use in electric parts and auxiliary machines of a vehicle. The bearing is also used as a bearing, for a motor, in which the lubricant composition is sealed.Type: GrantFiled: July 6, 2004Date of Patent: May 29, 2012Assignee: NTN CorporationInventors: Mika Kohara, Takayuki Kawamura, Kenji Tamada
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Publication number: 20120004002Abstract: A terminal device free of interference between an RACH and a PUSCH or the like even when a base station device with a large coverage is installed. In the device, a configuration number extraction unit (103) extracts a configuration number from a BCH received by a BCH reception unit (102). A control unit (104) determines the corresponding RACH format (the necessity of repetition, the CP length TCP, the second preamble length TPRE2, and the GT length TGT) according to the configuration number, notifies a repetition unit (109) of the result of the judgment of necessity of repetition, notifies the repetition unit (109) of the second preamble length TPRE2, notifies a CP addition unit (110) of the CP length TCP, and notifies a GT addition unit (112) of the GT length TGT. When the repetition unit (109) receives the notification of performing the repetition, it performs the repetition according to the second preamble length received from a TPRE2 determination section (154).Type: ApplicationFiled: August 8, 2008Publication date: January 5, 2012Applicant: PANASONIC CORPORATIONInventors: Masahiko Nanri, Tsutomu Onuki, Takayuki Kawamura
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Patent number: 8058216Abstract: The present invention provides a grease composition capable of securely preventing an abnormal noise from being generated when it is cold and having a long life at a high temperature, and a rolling bearing in which this grease is enclosed. The grease composition having heat-resistant properties and performance of preventing the generation of a low-temperature abnormal noise contains a base oil, a thickener, and an additive, and is used for a rolling bearing. A worked penetration of the grease composition at 25° C. is 300 or less, and an unworked penetration thereof at ?20° C. is 200 or more. The grease-enclosed rolling bearing has an inner ring, an outer ring, rolling elements interposed between the inner ring and the outer ring, and the above-described grease composition enclosed on a periphery of the rolling elements. The grease-enclosed rolling bearing is used for an automotive electric auxiliary machine.Type: GrantFiled: December 15, 2005Date of Patent: November 15, 2011Assignee: NTN CorporationInventor: Takayuki Kawamura
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Patent number: 8048835Abstract: The present invention provides a grease composition capable of securely preventing generation of a low-temperature abnormal noise when it is cold and a grease-enclosed bearing. A grease composition comprises a base oil and a thickener, wherein the base oil has a pour point not more than ?50° C. and a kinematic viscosity not less than 15 mm2/s at 40° C. The base oil is at least one oil selected from a PAO oil and a perfluoro ether oil. The thickener is at least one substance selected from a urea compound and a fluororesin. A mixing consistency of the grease composition is in the range of 250 to 350. A grease-enclosed bearing has an inner ring, an outer ring, rolling elements interposed between the inner ring and the outer ring, and a grease composition enclosed on a periphery of the rolling elements. The grease-enclosed bearing is used for an automotive electric auxiliary machine.Type: GrantFiled: March 25, 2005Date of Patent: November 1, 2011Assignee: NTN CorporationInventors: Takayuki Kawamura, Mitsunari Asao, Masaki Egami
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Publication number: 20110211361Abstract: A vehicle lighting device is provided which is capable of merely changing a shade, thereby using a first reflector and a second reflector as they are, to cope with a variety of light distribution pattern specifications, and which is capable of avoiding deformation of a shade due to a thermal effect even if incidence of sunlight going back has optically focused on the shade. In a heat sink member 40, there are arranged: a semiconductor-type light source 10; a first reflector 21 covering the semiconductor-type light source 10 therewith; a second reflector 22 for causing the reflected light from the first reflector 21so as to be made incident thereto and then reflecting the incident light forward of the lighting device; and a shade 30 for shading a part of the reflected light from the first reflector 21 so as to be made incident to the second reflector 22. The shade 30 is configured as another member independent of the first and second reflectors 21, 22, and is arranged in the heat sink 40.Type: ApplicationFiled: February 24, 2011Publication date: September 1, 2011Inventor: Takayuki KAWAMURA
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Patent number: 7980732Abstract: An projector type lamp includes a casing formed with a front open end and configured by connecting an upper casing member and a lower casing member to each other; a concave mirror formed on an inside face of the casing; a light source provided at the first focal point of the concave mirror; a convex lens configured to be held between the upper casing member and the lower casing member at the front open end of the casing and adapted to refract a reflected light that is emitted from the light source and reflected on the concave mirror so as to project a substantially parallel pencil beam forward from the project type lamp; provisional fixers provided on the upper casing member and the lower casing member respectively and configured to latch one another so as to provisionally fix the casing members to one another in place; and a fastener configured to fasten the provisionally-fixed casing members together.Type: GrantFiled: March 6, 2008Date of Patent: July 19, 2011Assignee: Ichikoh Industries, Ltd.Inventor: Takayuki Kawamura
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Publication number: 20110136578Abstract: It is an object of the present invention to provide a grease composition (7) which can be used for a long term in a wide temperature range from low to high temperatures by using comparatively inexpensive base oil. It is another object of the present invention to provide a rolling bearing and a universal joint in which the grease composition (7) is enclosed. The grease composition (7) is composed of base grease, consisting of base oil and a thickener, to which an additive is added. The base oil contains not less than 50 wt % of highly refined oil having a viscosity index of 120 to 180. The additive contains at least ZnDTP and 0.2 to 6 parts by weight of poly(metha)acrylate having a kinematic viscosity of not less than 100 mm2/s and less than 850 mm2/s at 100° C. for 100 parts by weight of the base grease. The grease composition (7) is enclosed in the circumferences of rolling elements (4) of a rolling bearing (1).Type: ApplicationFiled: September 3, 2009Publication date: June 9, 2011Applicant: NTN CORPORATIONInventor: Takayuki Kawamura
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Patent number: 7910525Abstract: The present invention provides a grease composition capable of effectively preventing a rolling surface of a bearing from having hydrogen brittleness-caused peeling, a grease-enclosed bearing in which the grease composition is enclosed, and a rotation-transmitting apparatus with a built-in one-way clutch in which the grease composition is enclosed at a sliding portion. The grease composition contains a base grease consisting of a base oil and a thickener; and an additive added to the base grease. The grease composition prevents a frictional wear surface of the sliding portion or a newly generated surface consisting of iron or the like exposed owing to wear from being peeled owing to hydrogen brittleness. The additive contains a bismuth-based additive or a magnesium-based additive. The bismuth-based additive consists of at least one of inorganic bismuth and organic bismuth not containing a sulfur component. The magnesium-based additive consists of at least one of inorganic magnesium and organic magnesium.Type: GrantFiled: April 20, 2006Date of Patent: March 22, 2011Assignee: NTN CorporationInventors: Hidenobu Mikami, Takayuki Kawamura