Patents by Inventor Hirotaka Tagawa
Hirotaka Tagawa 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: 11647761Abstract: A space which is present between an air intake surface (90a) provided with an air intake port and an air filter (76) is regarded as a primary space (P) through which air flows into the air filter (76), and a plurality of spaces, each of which is present between one of other surfaces of the air filter (76) and a filter box (90), are regarded as secondary spaces (Q) into each of which the air flows out from the air filter (76), so that the air is taken out from side surfaces and an upper surface of a filter unit (75). This configuration reduces the increase in size of the filter unit (75) of a gas supply device (30) even if a dust holding capacity of the filter is made larger than before.Type: GrantFiled: July 20, 2018Date of Patent: May 16, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Tagawa, Kazuyasu Matsui, Makoto Ikemiya
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Publication number: 20220404087Abstract: A casing is provided with a partition portion extending in a vertical direction so as to partition an outdoor space and an accommodation chamber from each other. The partition portion has an opening for providing communication between the outdoor space and the accommodation chamber. An eaves portion is provided above the opening.Type: ApplicationFiled: August 18, 2022Publication date: December 22, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Kento SHIBUYA, Hirotaka TAGAWA
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Patent number: 11137191Abstract: In a gas supply device that supplies gas to a target space through a filter unit, the filter unit is composed of a filter box and an air filter housed in the filter box, and the air filter is a filter having a filter substrate made of a membrane filter and a fibrous coating layer covering a surface of the filter substrate through which air is sucked.Type: GrantFiled: July 20, 2018Date of Patent: October 5, 2021Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Tagawa, Kazuyasu Matsui, Makoto Ikemiya
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Patent number: 11051525Abstract: A gas supply device is provided with a heating unit that heats gas flowing into a filter provided in a filter unit.Type: GrantFiled: September 19, 2018Date of Patent: July 6, 2021Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Tagawa, Makoto Ikemiya
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Publication number: 20200260749Abstract: A gas supply device is provided with a heating unit that heats gas flowing into a filter provided in a filter unit.Type: ApplicationFiled: September 19, 2018Publication date: August 20, 2020Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka TAGAWA, Makoto IKEMIYA
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Publication number: 20200229454Abstract: A space which is present between an air intake surface (90a) provided with an air intake port and an air filter (76) is regarded as a primary space (P) through which air flows into the air filter (76), and a plurality of spaces, each of which is present between one of other surfaces of the air filter (76) and a filter box (90), are regarded as secondary spaces (Q) into each of which the air flows out from the air filter (76), so that the air is taken out from side surfaces and an upper surface of a filter unit (75). This configuration reduces the increase in size of the filter unit (75) of a gas supply device (30) even if a dust holding capacity of the filter is made larger than before.Type: ApplicationFiled: July 20, 2018Publication date: July 23, 2020Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka TAGAWA, Kazuyasu MATSUI, Makoto IKEMIYA
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Publication number: 20200132355Abstract: In a gas supply device that supplies gas to a target space through a filter unit, the filter unit is composed of a filter box and an air filter housed in the filter box, and the air filter is a filter having a filter substrate made of a membrane filter and a fibrous coating layer covering a surface of the filter substrate through which air is sucked.Type: ApplicationFiled: July 20, 2018Publication date: April 30, 2020Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka TAGAWA, Kazuyasu MATSUI, Makoto IKEMIYA
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Patent number: 9561502Abstract: A conductive polymer material which can achieve longer operating life by improving resistance stability at the time of performing continuous conduction, a method for producing the conductive polymer material, and an image forming device member are provided. A conductive polymer material containing a quaternary ammonium base incorporated in a main chain of a polymer material as an electrolyte cation, and an alkyl sulfate radical as an electrolyte anion.Type: GrantFiled: January 10, 2014Date of Patent: February 7, 2017Assignee: BRIDGESTONE CORPORATIONInventors: Tadashi Nakajima, Hirotaka Tagawa
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Patent number: 9535354Abstract: A conductive roller in which dripping of a water-based coating during the manufacture thereof is restrained, and a manufacturing method thereof. The conductive roller includes a shaft, at least one elastic layer formed on the outer periphery of the shaft and a surface layer formed on the outer peripheral surface of the elastic layer. The elastic layer is formed by using a coating for elastic layers containing a liquid absorbing agent, and the surface layer is formed by using a coating for surface layers. The method comprises forming an elastic layer by applying a coating for elastic layers containing a liquid absorbing agent on the outer periphery of the shaft and drying to form the elastic layer; and forming a surface layer by, after forming the elastic layer, applying a coating for surface layers on the formed elastic layer and drying to form the surface layer.Type: GrantFiled: December 15, 2010Date of Patent: January 3, 2017Assignee: BRIDGESTONE CORPORATIONInventors: Hirotaka Tagawa, Junichi Takano, Izumi Yoshimura, Daijirou Sirakura
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Publication number: 20150352542Abstract: A conductive polymer material which can achieve longer operating life by improving resistance stability at the time of performing continuous conduction, a method for producing the conductive polymer material, and an image forming device member are provided. A conductive polymer material containing a quaternary ammonium base incorporated in a main chain of a polymer material as an electrolyte cation, and an alkyl sulfate radical as an electrolyte anion.Type: ApplicationFiled: January 10, 2014Publication date: December 10, 2015Applicant: BRIDGESTONE CORPORATIONInventors: Tadashi NAKAJIMA, Hirotaka TAGAWA
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Patent number: 9201337Abstract: A developing roller in which the decay rate of the surface potential is high and in which an image failure caused by the accumulation of electric charge does not occur is provided. The developing roller 10 includes a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft, and at least one coating layer 3, 4 formed on the outer periphery of the elastic layer. The volume resistivity of a layer on the inner periphery side of the elastic layer and the coating layer is smaller than the volume resistivity of a layer on the outer periphery side, and the difference between the volume resistivities of the elastic layer and the coating layer positioned on the outermost periphery side is in the range of 2.8 to 4.3 (Log ?cm).Type: GrantFiled: July 5, 2012Date of Patent: December 1, 2015Assignee: BRIDGESTONE CORPORATIONInventors: Hirotaka Tagawa, Takayuki Sugimura
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Patent number: 8932194Abstract: An electrically conductive roller which may easily obtain a desired surface roughness, and which has good setting property without problems such as high cost and compression set is provided. An electrically conductive roller 10 comprises a shaft 1, an elastic layer 2 supported on the periphery of the shaft and one surface layer 3 formed on the peripheral surface of the elastic layer 2. The elastic layer 2 is composed of a urethane foam in which the degree of swelling is not more than 120% with respect to the solvent used in the formation of the surface layer 3. The urethane foam preferably contains, as a polyol component, a polyester polyol having a hydroxyl value of 200 to 400 and 3 or more functional groups.Type: GrantFiled: May 8, 2008Date of Patent: January 13, 2015Assignee: Bridgestone CorporationInventors: Hirotaka Tagawa, Kota Kawano, Takayuki Sugimura
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Publication number: 20140126935Abstract: A developing roller in which the decay rate of the surface potential is high and in which an image failure caused by the accumulation of electric charge does not occur is provided. The developing roller 10 includes a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft, and at least one coating layer 3, 4 formed on the outer periphery of the elastic layer. The volume resistivity of a layer on the inner periphery side of the elastic layer and the coating layer is smaller than the volume resistivity of a layer on the outer periphery side, and the difference between the volume resistivities of the elastic layer and the coating layer positioned on the outermost periphery side is in the range of 2.8 to 4.3 (Log ?km).Type: ApplicationFiled: July 5, 2012Publication date: May 8, 2014Applicant: BRIDGESTONE CORPORATIONInventors: Hirotaka Tagawa, Takayuki Sugimura
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Patent number: 8711543Abstract: Provided is an electrifying roller which may be used in a contact electrification method, which may be manufactured more easily, and which may better prevent problems caused by an electrically conductive material.Type: GrantFiled: August 24, 2009Date of Patent: April 29, 2014Assignee: Bridgestone CorporationInventors: Junichi Takano, Hirotaka Tagawa, Izumi Egashira, Daijirou Sirakura
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Patent number: 8642148Abstract: Provided is an electrifying roller which is manufactured more easily, and has a good electrical conduction property with a small amount of electrically conductive material. Provided are electrifying rollers (10, 20) comprising a shaft 1, an elastic layer 2 formed on the periphery of the shaft 1, and a surface layer 3 formed on the periphery surface of the elastic layer 2, wherein the elastic layer 2 is formed by an ultraviolet curing resin having a phosphoester group. It is preferred that the ultraviolet curing resin be made of a compound represented by the following Formula (1): (wherein R1 is represented by the following Formula (2): (CH2)m??(2) (where m is an integer from 1 to 10), R2 is represented by any one of the following Formulae (3) to (9): R3 is represented by any one of the following Formulae (10) to (12): (where r, s and t are an integer from 10 to 150), and n is an integer from 1 to 10).Type: GrantFiled: August 24, 2009Date of Patent: February 4, 2014Assignee: Bridgestone CorporationInventors: Izumi Egashira, Hirotaka Tagawa, Junichi Takano, Daijirou Sirakura
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Patent number: 8550968Abstract: There is a developing roller having a low compression permanent strain without contaminating a photosensitive drum and deteriorating toners. The developing roller 1 comprises a shaft 2, an elastic layer 3 formed on an outer periphery of the shaft 2 and a surface coating layer 4 formed on an outer peripheral face of the elastic layer 3, in which the surface coating layer 4 comprises a urethane resin formed by crosslinking a lactone-modified polyol with a polyisocyanate. The urethane resin is preferable to be formed by crosslinking the lactone-modified polyol with two or more kinds of polyisocyanates.Type: GrantFiled: November 8, 2006Date of Patent: October 8, 2013Assignee: Bridgestone CorporationInventors: Takayuki Sugimura, Kouta Kawano, Takuro Sugimoto, Hirotaka Tagawa
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Patent number: 8401444Abstract: A developing roller which shows an excellent environmental performance and is free from occurrence of toner filming and toner leakage is provided. The developing roller 10 comprises a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft 1, and a single surface layer 3 formed on the outer peripheral surface of the elastic layer 2. The elastic layer 2 comprises a polyurethane foam and the surface layer 3 comprises an aqueous polyurethane resin as a major component and further a water-dispersible silica and/or an aqueous silicone acrylic graft polymer. As the aqueous polyurethane resin, a UV curing resin may be preferably used.Type: GrantFiled: July 14, 2008Date of Patent: March 19, 2013Assignee: Bridgestone CorporationInventors: Takayuki Sugimura, Kota Kawano, Hirotaka Tagawa
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Publication number: 20120316045Abstract: Provided is a conductive roller in which dripping of a coating, in particular, a water-based coating during the manufacture thereof is restrained, and a manufacturing method thereof. Provided is a conductive roller including a shaft 1, at least one elastic layer 2 formed on the outer periphery of the shaft 1 and a surface layer 3 formed on the outer peripheral surface of the elastic layer 2. The elastic layer 2 is formed by using a coating for elastic layers containing a liquid absorbing agent, and the surface layer 3 is formed by using a coating for surface layers.Type: ApplicationFiled: December 15, 2010Publication date: December 13, 2012Applicant: BRIDGESTONE CORPORATIONInventors: Hirotaka Tagawa, Junichi Takano, Izumi Yoshimura, Daijirou Sirakura
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Publication number: 20120129666Abstract: Provided is an electrifying roller which is manufactured more easily, and has a good electrical conduction property with a small amount of electrically conductive material. Provided are electrifying rollers (10, 20) comprising a shaft 1, an elastic layer 2 formed on the periphery of the shaft 1, and a surface layer 3 formed on the periphery surface of the elastic layer 2, wherein the elastic layer 2 is formed by an ultraviolet curing resin having a phosphoester group. It is preferred that the ultraviolet curing resin be made of a compound represented by the following Formula (1): (wherein R1 is represented by the following Formula (2): ?CH2?m??(2) (where m is an integer from 1 to 10), R2 is represented by any one of the following Formulae (3) to (9): R3 is represented by any one of the following Formulae (10) to (12): (where r, s and t are an integer from 10 to 150), and n is an integer from 1 to 10).Type: ApplicationFiled: August 24, 2009Publication date: May 24, 2012Applicant: BRIDGESTONE CORPORATIONInventors: Izumi Egashira, Hirotaka Tagawa, Junichi Takano, Daijirou Sirakura
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Publication number: 20110249372Abstract: Provided is an electrifying roller which may be used in a contact electrification method, which may be manufactured more easily, and which may better prevent problems caused by an electrically conductive material. Provided is an electrifying roller (10), (20) of the present invention has a shaft (1), an elastic layer (2) formed on the periphery of the shaft (1), and a surface layer (3) formed on the periphery surface of the elastic layer (2), wherein the elastic layer (2) is formed by an ultraviolet curing resin, and the surface layer is formed by a heat curing resin. it is preferred that the thickness of said elastic layer (2) be 0.9 to 1.3 mm and that the shaft (1) be a hollow cylinder or solid cylinder made of metal.Type: ApplicationFiled: August 24, 2009Publication date: October 13, 2011Applicant: BRIDGESTONE CORPORATIONInventors: Junichi Takano, Hirotaka Tagawa, Izumi Egashira, Daijirou Sirakura