Patents by Inventor Kei Hirata
Kei Hirata 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: 9850336Abstract: The present invention relates to a copolymer including a monomer unit (a) derived from a conjugated diene having not more than 12 carbon atoms and a monomer unit (b) derived from farnesene; a process for producing the copolymer including at least the step of copolymerizing a conjugated diene having not more than 12 carbon atoms with farnesene; a rubber composition including (A) the copolymer, (B) a rubber component and (C) carbon black; a rubber composition including (A) the copolymer, (B) a rubber component and (D) silica; a rubber composition including (A) the copolymer, (B) a rubber component, (C) carbon black and (D) silica; and a tire using the rubber composition at least as a part thereof.Type: GrantFiled: April 2, 2013Date of Patent: December 26, 2017Assignees: KURARAY Co., Ltd., AMYRIS, INC.Inventors: Daisuke Koda, Kei Hirata
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Publication number: 20170327681Abstract: The present invention provides a sealing material composition including 100 parts by mass of a polymer of farnesene (A) and from 1 to 4,000 parts by mass of a filler (B).Type: ApplicationFiled: October 27, 2015Publication date: November 16, 2017Applicants: KURARAY CO., LTD., AMYRIS, INC.Inventors: Hiroshi KANBARA, Kei HIRATA
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Publication number: 20170260374Abstract: The present invention relates to a copolymer including a monomer unit (a) derived from isoprene and a monomer unit (b) derived from farnesene; a process for producing the copolymer including at least the step of copolymerizing isoprene with farnesene; a rubber composition including (A) the copolymer, (B) a rubber component and (C) carbon black; a rubber composition including (A) the copolymer, (B) a rubber component and (D) silica; a rubber composition including (A) the copolymer, (B) a rubber component, (C) carbon black and (D) silica; and a tire using the rubber composition at least as a part thereof.Type: ApplicationFiled: May 24, 2017Publication date: September 14, 2017Applicants: KURARAY CO., LTD., AMYRIS, INC.Inventors: Daisuke KODA, Kei Hirata
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Patent number: 9741371Abstract: A magnetic head includes a main pole, a write shield and a gap section. The write shield includes a trailing shield, a leading shield and two side shields. The gap section includes a trailing gap section, a leading gap section and two side gap sections. Each of the two side gap sections and the leading gap section increases in thickness with increasing distance from a medium facing surface. In the medium facing surface, the thickness of the leading gap section is greater than the width of each of the two side gap sections, and the width of each of the two side gap sections decreases with decreasing distance to the leading gap section.Type: GrantFiled: March 24, 2015Date of Patent: August 22, 2017Assignee: TDK CORPORATIONInventors: Atsushi Yamaguchi, Michitaka Nishiyama, Kei Hirata, Kenkichi Anagawa
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Patent number: 9732206Abstract: The present invention relates to a copolymer including a monomer unit (a) derived from isoprene and a monomer unit (b) derived from farnesene; a process for producing the copolymer including at least the step of copolymerizing isoprene with farnesene; a rubber composition including (A) the copolymer, (B) a rubber component and (C) carbon black; a rubber composition including (A) the copolymer, (B) a rubber component and (D) silica; a rubber composition including (A) the copolymer, (B) a rubber component, (C) carbon black and (D) silica; and a tire using the rubber composition at least as a part thereof.Type: GrantFiled: April 2, 2013Date of Patent: August 15, 2017Assignees: KURARAY CO., LTD., AMYRIS, INC.Inventors: Daisuke Koda, Kei Hirata
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Patent number: 9721592Abstract: This perpendicular magnetic recording head includes: a magnetic pole; a pair of side shields disposed to face each other with the magnetic pole interposed therebetween in a cross track direction; a pair of side gaps each provided between the magnetic pole and the pair of side shields; a trailing gap provided to cover the magnetic pole and the pair of side gaps, and having a first width in the cross track direction; and a first magnetic layer covering the trailing gap and having a second width larger than the first width in the cross track direction.Type: GrantFiled: May 26, 2016Date of Patent: August 1, 2017Assignee: TDK CORPORATIONInventors: Kei Hirata, Shingo Miyata
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Patent number: 9704511Abstract: The perpendicular magnetic recording head includes a magnetic pole including a first region and a second region, the first region having a first specific resistance and an end surface exposed on an air bearing surface, the second region having a second specific resistance higher than the first specific resistance and being located at a position recessed from the air bearing surface.Type: GrantFiled: November 12, 2014Date of Patent: July 11, 2017Assignee: TDK CORPORATIONInventors: Hideyuki Ukita, Kenkichi Anagawa, Kei Hirata, Atsushi Yamaguchi, Ittetsu Kitajima
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Patent number: 9640205Abstract: A magnetic recording-reproducing head includes, on a support member, a first head section having a function of executing a recording process and having a function of executing a reproducing process, and one or more second head sections each having a function of executing an erasing process and having no function of executing a reproducing process.Type: GrantFiled: March 10, 2016Date of Patent: May 2, 2017Assignee: TDK CORPORATIONInventors: Akimasa Kaizu, Kei Hirata, Yosuke Antoku
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Patent number: 9598507Abstract: A modified liquid diene-based rubber (A) including, in a molecule, a modified group (a) containing a (meth)acryloyl group as a part thereof and at least one modified group (b) selected from a dicarboxylic acid monoester and a dicarboxylic acid monoamide, with the proviso that the modified group (b) comprises no (meth)acryloyl group as a part thereof, wherein the functional group equivalent weights of the modified group (a) and the modified group (b) are each in the range of 700 to 40,000 g/eq. Also provided is a curable resin composition containing the modified liquid diene-based rubber.Type: GrantFiled: November 27, 2014Date of Patent: March 21, 2017Assignee: KURARAY CO., LTD.Inventors: Satoshi Motoda, Kei Hirata
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Publication number: 20170073509Abstract: [Object] The invention provides rubber compositions having excellent filler dispersibility, crosslinked products having excellent properties such as abrasion resistance, and tires that exhibit enhanced rolling resistance performance and attain simultaneous enhancements in steering stability and ice grip performance by virtue of using the compositions or the crosslinked products in portions of the tires. [Solution] The rubber composition includes 100 parts by mass of a solid rubber (A), 0.1 to 10 parts by mass of a modified liquid diene rubber (B) that is obtained by adding a modifying agent to an unmodified liquid diene rubber (B?) and has functional groups derived from the modifying agent, and 20 to 150 parts by mass of a filler (C).Type: ApplicationFiled: March 10, 2015Publication date: March 16, 2017Applicant: KURARAY CO., LTD.Inventors: Daisuke KODA, Kei HIRATA
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Publication number: 20170009065Abstract: [Object] The invention provides rubber compositions having excellent filler dispersibility, crosslinked products having excellent properties such as abrasion resistance, and tires that exhibit enhanced rolling resistance performance and attain simultaneous enhancements in steering stability and ice grip performance by virtue of using the compositions or the crosslinked products in portions of the tires. [Solution] The rubber composition includes 100 parts by mass of a solid rubber (A), 0.1 to 10 parts by mass of a modified liquid diene rubber (B) that is obtained by adding a modifying agent to an unmodified liquid diene rubber (B?) and has functional groups derived from the modifying agent, and 20 to 150 parts by mass of a filler (C).Type: ApplicationFiled: March 10, 2015Publication date: January 12, 2017Applicant: KURARAY CO., LTD.Inventors: Daisuke KODA, Kei HIRATA
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Patent number: 9534111Abstract: The present invention relates to a rubber composition including (A) at least one rubber component selected from the group consisting of a synthetic rubber and a natural rubber; (B) a polymer of farnesene; and (C) carbon black having an average particle size of from 5 to 100 nm, a content of the carbon black (C) in the rubber composition being from 20 to 100 parts by mass on the basis of 100 parts by mass of the rubber component (A).Type: GrantFiled: November 10, 2014Date of Patent: January 3, 2017Assignees: KURARAY CO., LTD., AMYRIS, INC.Inventors: Shigenao Kuwahara, Kei Hirata, Daisuke Koda
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Publication number: 20160284366Abstract: A magnetic head includes a main pole, a write shield and a gap section. The write shield includes a trailing shield, a leading shield and two side shields. The gap section includes a trailing gap section, a leading gap section and two side gap sections. Each of the two side gap sections and the leading gap section increases in thickness with increasing distance from a medium facing surface. In the medium facing surface, the thickness of the leading gap section is greater than the width of each of the two side gap sections, and the width of each of the two side gap sections decreases with decreasing distance to the leading gap section.Type: ApplicationFiled: March 24, 2015Publication date: September 29, 2016Inventors: Atsushi YAMAGUCHI, Michitaka NISHIYAMA, Kei HIRATA, Kenkichi ANAGAWA
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Patent number: 9421949Abstract: A wiper for a vehicle is provided with: an arm-side connection section; a blade-side connection section; support shafts which protrude from side walls of the blade-side connection section; and shaft support recesses which are provided in the arm-side connection section. When a wiper blade is located in a mounting-dismounting enabled region, the mounting-dismounting openings and the small-diameter sections of the support shafts match with each other, and the support shafts and the shaft support recesses can be mounted to and dismounted from each other. When the wiper blade is located in a mounting-dismounting disabled region, the mounting-dismounting openings and the small-diameter sections do not match with each other, and the support shafts and the shaft support recesses cannot be mounted to and dismounted from each other. A shape retaining section is located between the pair of the shaft support recesses.Type: GrantFiled: October 23, 2013Date of Patent: August 23, 2016Assignee: ASMO CO., LTD.Inventors: Keita Uchiyama, Kei Hirata
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Publication number: 20160229927Abstract: Provided is a modified liquid diene-based rubber having an acryloyl group or a methacryloyl group, which is highly compatible with various monomers, such as acrylate or methacrylate having relatively high polarity, which can form a curable resin composition containing the modified liquid diene-based rubber with good workability, which has a satisfactory curing rate during curing, and which is capable of providing the curable resin composition that forms a cured product having excellent mechanical properties derived from the modified liquid diene-based rubber and having excellent adhesion to various materials. Also provided is a curable resin composition containing the modified liquid diene-based rubber.Type: ApplicationFiled: November 27, 2014Publication date: August 11, 2016Applicant: KURARAY CO., LTD.Inventors: Satoshi MOTODA, Kei HIRATA
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Publication number: 20160200902Abstract: The present invention provides a rubber composition capable of producing a rubber molded article that is excellent in rolling resistance performance, steering stability, mechanical strength and abrasion resistance, and a tire obtained by using the rubber composition in at least a part thereof. The present invention relates to a rubber composition including (A) a rubber component including at least one rubber selected from the group consisting of a synthetic rubber and a natural rubber, (B) silica and (C) a modified polymer of farnesene obtained by introducing a functional group into a polymer of farnesene, in which a content of the silica (B) in the rubber composition is from 20 to 150 parts by mass on the basis of 100 parts by mass of the rubber component (A), and a content of the modified farnesene polymer (C) in the rubber composition is from 2 to 10 parts by mass on the basis of 100 parts by mass of the silica (B).Type: ApplicationFiled: August 11, 2014Publication date: July 14, 2016Applicants: KURARAY CO., LTD., AMYRIS, INC.Inventors: Daisuke KODA, Kei HIRATA
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Publication number: 20160133276Abstract: The perpendicular magnetic recording head includes a magnetic pole including a first region and a second region, the first region having a first specific resistance and an end surface exposed on an air bearing surface, the second region having a second specific resistance higher than the first specific resistance and being located at a position recessed from the air bearing surface.Type: ApplicationFiled: November 12, 2014Publication date: May 12, 2016Inventors: Hideyuki UKITA, Kenkichi ANAGAWA, Kei HIRATA, Atsushi YAMAGUCHI, Ittetsu KITAJIMA
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Patent number: 9315171Abstract: A wiper device includes: a pivot shaft that rotates back and forth within a predetermined angular range; an arm head that is fixed to the pivot shaft; a cover that is mounted to the arm head; and a wiper arm that is pivotally supported on the arm head to come into and out of contact with a surface to be wiped. The wiper arm includes an engagement concave portion that extends in a longitudinal direction of the wiper arm at a side portion in a pivot direction of the wiper arm. The cover includes an engagement convex portion that extends in the longitudinal direction of the wiper arm. Relative movement of the wiper arm and the cover is restricted by engagement between an engagement wall portion of the engagement concave portion and the engagement convex portion.Type: GrantFiled: April 2, 2015Date of Patent: April 19, 2016Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, ASMO CO., LTD.Inventors: Akira Matsuura, Junya Nogami, Kei Hirata, Takashi Umeno, Masanori Takeuchi
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Patent number: 9293165Abstract: A recording head has a near field light (NF light) generator generating NF light on a generator end surface that irradiates a magnetic recording (MR) medium; a main magnetic pole including a pole end surface facing an air bearing surface (ABS) that emits magnetic flux to the MR medium from the pole end surface; and a return shield having a shield end surface facing the ABS, that is magnetically linked with the main magnetic pole, and absorbs magnetic flux from the MR medium at the shield end surface. The pole end surface and the shield end surface are on the same side of the generator end surface in the down track direction, and are close to each other in the track crossing direction. A center line in the down track direction of the generator end surface extends between opposing sides of the pole end surface and the shield end surface.Type: GrantFiled: March 11, 2014Date of Patent: March 22, 2016Assignee: TDK CorporationInventors: Susumu Aoki, Takafumi Kobayashi, Ryo Hosoi, Kei Hirata
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Publication number: 20160053097Abstract: The invention relates to a rubber composition having a good processability, and simultaneously having a rolling resistance performance and hardness after vulcanization at high levels, with which the contamination of the mold for processing due to the bleeding-out of the plasticizer can be suppressed, and in which the migration of the plasticizer and so on is suppressed to a low level; a vulcanized rubber obtained by vulcanizing the rubber composition; and to a tire including the rubber composition as at least a part thereof. The rubber composition contains 100 parts by mass of rubber component (A) composed of at least one of a synthetic rubber and a natural rubber, 0.1 to 50 parts by mass of a diene polymer (B), 20 to 150 parts by mass of a filler (C), 0.1 to 10 parts by mass of a vulcanizing agent (D), 0.1 to 15 parts by mass of a vulcanization accelerator (E) and 0.1 to 15 parts by mass of vulcanization aid (F).Type: ApplicationFiled: March 25, 2014Publication date: February 25, 2016Applicant: KURARAY CO., LTD.Inventors: Daisuke KODA, Kei HIRATA, Hiroshi KANBARA