Patents by Inventor Takefumi Furuta
Takefumi Furuta 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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Publication number: 20230193075Abstract: The present invention provides an amide acid oligomer which has specific composition and which is capable of providing a cured product having excellent physical properties, in particular, an excellent glass transition temperature, etc.Type: ApplicationFiled: March 5, 2021Publication date: June 22, 2023Applicants: KANEKA CORPORATION, JAPAN AEROSPACE EXPLORATION AGENCYInventors: Takefumi Furuta, Yoshio Furukawa, Rikio Yokota, Yuichi Ishida
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Publication number: 20230042415Abstract: The present invention provides an amide acid oligomer which has specific composition and which is capable of providing a cured product having excellent physical properties, in particular, an excellent glass transition temperature, etc.Type: ApplicationFiled: September 29, 2022Publication date: February 9, 2023Applicants: KANEKA CORPORATION, JAPAN AEROSPACE EXPLORATION AGENCYInventors: Takefumi Furuta, Yoshio Furukawa, Rikio Yokota, Yuichi Ishida
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Patent number: 11492446Abstract: An object of the present invention is to reduce or eliminate a defect (e.g., a void) by achieving (i) a semipreg and a prepreg each of which allows a reduction in residual volatile component and (ii) methods for producing the semipreg and the prepreg, respectively, and consequently to achieve (iii) a fiber-reinforced composite material which has high heat resistance and superior mechanical strength and a (iv) a method for producing the fiber-reinforced composite material. The present invention attains the above object by providing, for example, a semipreg containing: powders of an imide oligomer; and reinforcement fibers, the imide oligomer being represented by a specific general formula (1).Type: GrantFiled: March 22, 2018Date of Patent: November 8, 2022Assignees: KANEKA CORPORATION, JAPAN AEROSPACE EXPLORATION AGENCYInventors: Yoshio Furukawa, Takefumi Furuta, Takeshi Chiba, Rikio Yokota, Yuichi Ishida
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Publication number: 20210340327Abstract: In order to provide an imide oligomer or the like which can give a cured product exhibiting excellent thermal oxidative stability, an imide oligomer is obtained by reacting together an aromatic tetracarboxylic acid component, an aromatic diamine component, and a terminal capping agent. The imide oligomer contains, in a specified proportion: a compound containing a phenylethynyl group; and a compound containing no carbon-carbon unsaturated bond capable of an addition reaction. One or each of the aromatic tetracarboxylic acid component and the aromatic diamine component contains a component having an asymmetrical and non-planar structure.Type: ApplicationFiled: July 14, 2021Publication date: November 4, 2021Applicant: KANEKA CORPORATIONInventors: Takefumi Furuta, Yoshio Furukawa, Rikio Yokota, Yuki Kubota, Yuichi Ishida
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Publication number: 20200148846Abstract: An object of the present invention is to reduce or eliminate a defect (e.g., a void) by achieving (i) a semipreg and a prepreg each of which allows a reduction in residual volatile component and (ii) methods for producing the semipreg and the prepreg, respectively, and consequently to achieve (iii) a fiber-reinforced composite material which has high heat resistance and superior mechanical strength and a (iv) a method for producing the fiber-reinforced composite material. The present invention attains the above object by providing, for example, a semipreg containing: powders of an imide oligomer; and reinforcement fibers, the imide oligomer being represented by a specific general formula (1).Type: ApplicationFiled: March 22, 2018Publication date: May 14, 2020Applicants: KANEKA CORPORATION, JAPAN AEROSPACE EXPLORATION AGENCYInventors: Yoshio FURUKAWA, Takefumi FURUTA, Takeshi CHIBA, Rikio YOKOTA, Yuichi ISHIDA
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Patent number: 10526450Abstract: A terminally modified imide oligomer is represented by a specific formula including a 2-phenyl-4,4?-diaminodiphenylether residue or a 4-phenoxy-1,3-diaminobenzene residue. A varnish is obtained by dissolving the terminally modified imide oligomer. A cured product is obtained by heat-curing the terminally modified imide oligomer, and a film including the cured product has a tensile elongation at break of 10% or more. An imide prepreg is obtained by impregnating fibers with the varnish and then drying the impregnated fibers. A fiber-reinforced composite material is obtained by layering and then heat-curing the imide prepreg.Type: GrantFiled: November 8, 2018Date of Patent: January 7, 2020Assignee: KANEKA CORPORATIONInventors: Takefumi Furuta, Masahiko Miyauchi, Rikio Yokota, Yuichi Ishida
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Publication number: 20190071541Abstract: A terminally modified imide oligomer is represented by a specific formula including a 2-phenyl-4,4?-diaminodiphenylether residue or a 4-phenoxy-1,3-diaminobenzene residue. A varnish is obtained by dissolving the terminally modified imide oligomer. A cured product is obtained by heat-curing the terminally modified imide oligomer, and a film including the cured product has a tensile elongation at break of 10% or more. An imide prepreg is obtained by impregnating fibers with the varnish and then drying the impregnated fibers. A fiber-reinforced composite material is obtained by layering and then heat-curing the imide prepreg.Type: ApplicationFiled: November 8, 2018Publication date: March 7, 2019Applicant: KANEKA CORPORATIONInventors: Takefumi Furuta, Masahiko Miyauchi, Rikio Yokota, Yuichi Ishida
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Patent number: 9844865Abstract: A driving tool includes a first cylinder that generates compressed air by reciprocating movement of a first piston slidably disposed therein. A longitudinal direction of the first cylinder intersects a longitudinal direction of a second cylinder and extends alongside a magazine that feeds fasteners onto an axis of movement of a driving part of a second piston. The first piston reciprocally slides in a direction that extends alongside the magazine. A tool handle is disposed on the side of the first cylinder that is opposite from the magazine in the direction of the axis of movement.Type: GrantFiled: April 4, 2013Date of Patent: December 19, 2017Assignee: MAKITA CORPORATIONInventors: Takefumi Furuta, Shinji Hirabayashi, Tadasuke Matsuno
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Publication number: 20150174748Abstract: A driving tool includes a first cylinder that generates compressed air by reciprocating movement of a first piston slidably disposed therein. A longitudinal direction of the first cylinder intersects a longitudinal direction of a second cylinder and extends alongside a magazine that feeds fasteners onto an axis of movement of a driving part of a second piston. The first piston reciprocally slides in a direction that extends alongside the magazine. A tool handle is disposed on the side of the first cylinder that is opposite from the magazine in the direction of the axis of movement.Type: ApplicationFiled: April 4, 2013Publication date: June 25, 2015Inventors: Takefumi Furuta, Shinji Hirabayashi, Tadasuke Matsuno
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Patent number: 8148000Abstract: It is an object of the invention to provide a technique to further increase protection performance for a battery pack of power tool. A representative power tool may include a tool body to which a tool bit is coupled to perform a predetermined operation, a driving motor that is disposed within the tool body, a battery pack that supplies driving current to the driving motor, the battery pack being removably mounted to the tool body and placed on the outside of the tool body in an exposed state, and a protector that is removably mounted to the tool body to protect the battery pack. The protector may include a battery pack protection area that protects the battery pack mounted to the tool body when the protector is mounted to the tool body. The battery pack protection area is dosed on at least part of the outer surface of the battery pack with a clearance and prevents transmission of external force upon the battery pack protection area to the battery pack.Type: GrantFiled: August 1, 2007Date of Patent: April 3, 2012Assignee: Makita CorporationInventors: Takefumi Furuta, Munetoshi Goto, Shinsuke Okuda
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Patent number: 7380612Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.Type: GrantFiled: October 5, 2007Date of Patent: June 3, 2008Assignee: Makita CorporationInventor: Takefumi Furuta
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Patent number: 7380613Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.Type: GrantFiled: October 5, 2007Date of Patent: June 3, 2008Assignee: Makita CorporationInventor: Takefumi Furuta
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Publication number: 20080041602Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.Type: ApplicationFiled: October 5, 2007Publication date: February 21, 2008Applicant: MAKITA CORPORATIONInventor: Takefumi Furuta
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Publication number: 20080035360Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.Type: ApplicationFiled: October 5, 2007Publication date: February 14, 2008Applicant: Makita CorporationInventor: Takefumi Furuta
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Publication number: 20080032190Abstract: It is an object of the invention to provide a technique to further increase protection performance for a battery pack of power tool. A representative power tool may include a tool body to which a tool bit is coupled to perform a predetermined operation, a driving motor that is disposed within the tool body, a battery pack that supplies driving current to the driving motor, the battery pack being removably mounted to the tool body and placed on the outside of the tool body in an exposed state, and a protector that is removably mounted to the tool body to protect the battery pack. The protector may include a battery pack protection area that protects the battery pack mounted to the tool body when the protector is mounted to the tool body. The battery pack protection area is dosed on at least part of the outer surface of the battery pack with a clearance and prevents transmission of external force upon the battery pack protection area to the battery pack.Type: ApplicationFiled: August 1, 2007Publication date: February 7, 2008Applicant: MAKITA CORPORATIONInventors: Takefumi Furuta, Munetoshi Goto, Shinsuke Okuda
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Patent number: 7308948Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.Type: GrantFiled: October 18, 2005Date of Patent: December 18, 2007Assignee: Makita CorporationInventor: Takefumi Furuta
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Patent number: 7131503Abstract: An impact driver capable of boring and having an excellent usability is provided. An anvil(8) is arranged so as to slightly move in the axial direction. A first cam(29) having cam gears(30, 30 . . . ) is externally provided at the anvil so as to be integral with the anvil(8). At the rear of the first cam(29), a second cam(31) having cam gears(32, 32 . . . ) and further having cam gears(36, 36 . . . ) at its outer circumference is externally provided to the anvil(8) so as to be rotatable. At the backward position of the anvil(8), the cam gears(30, 32) contacts with each other. On the other hand, in the cylindrical portion(27) of the hammer case(5), an engaging pin(37) capable of engaging with an engaging gear(36) of the second cam(31) is provided. The engaging pin(37) can change its location by the rotative operation of a mode-change ring(40), whereby a percussion mode and a non-percussion mode is selected.Type: GrantFiled: January 31, 2005Date of Patent: November 7, 2006Assignee: Makita CorporationInventors: Takefumi Furuta, Hidenori Nagasaka
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Patent number: 7124839Abstract: An impact driver in which a drill mode can be selected without fail is provided. In a hammer case, a connecting sleeve is provided so as to be slidable back and forth. At the backward position, the connecting sleeve engages with only a first engaging tooth provided on the outer circumference of the hammer for rotating integrally. At the forward position, it engages with both the first engaging tooth of the hammer and a second engaging tooth of an anvil for rotating integrally with both of them, and thus a drill mode is obtained. Further, an operating bolt is provided in the hammer case to be inserted into a concave groove of the connecting sleeve through a guide groove formed in the hammer case. The operating bolt slides the connecting sleeve to the forward or backward position by its movement in the guide groove.Type: GrantFiled: March 3, 2005Date of Patent: October 24, 2006Assignee: Makita CorporationInventors: Takefumi Furuta, Yoshihiro Ito
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Publication number: 20060090913Abstract: An electric power tool is provided which prevents malfunction with excellent operability even when one operation mode among various modes is selectable. In a gear case of a housing, there are provided a clutch switching groove which engages with a connecting projection of a clutch switching lever, a slit which guides a guide body having a stepped pin which penetrates an impact switching groove to engage with an auxiliary ring, and a percussion switching groove which engages with a connecting projection of a percussion switching lever. In addition, a switching case is externally provided, so that combination of sliding positions of each switching member can be changed. As the switching case can be operated by a switching button, any of all operation modes, which are, a drill mode, an impact mode, a percussion drill mode, and a clutch mode can be selected with the switching button only.Type: ApplicationFiled: October 18, 2005Publication date: May 4, 2006Applicant: Makita CorporationInventor: Takefumi Furuta
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Patent number: D520834Type: GrantFiled: July 26, 2005Date of Patent: May 16, 2006Assignee: Makita CorporationInventors: Takefumi Furuta, Yuji Yamamoto