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).

  • Patent number: 11699460
    Abstract: A PMR (perpendicular magnetic recording) write head includes a main write pole (MP) that is surrounded by magnetic shields, including laterally disposed side shields (SS), a trailing shield (TS) and a leading shield (LS). The leading shield includes a leading-edge taper (LET) that conformally abuts a tapered side of the write pole. The leading-edge shield and the leading-edge taper can be independently recessed in a proximal direction away from an air bearing surface (ABS) plane so that one or the other of them is recessed and the other remains coplanar with the ABS, or both are recessed by independent amounts. In another configuration the LS is not planar but has a recessed portion in a center track region and two surrounding regions that are coplanar with the ABS plane.
    Type: Grant
    Filed: March 30, 2022
    Date of Patent: July 11, 2023
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Yuhui Tang, Yue Liu, Kei Hirata
  • Publication number: 20220223176
    Abstract: A PMR (perpendicular magnetic recording) write head includes a main write pole (MP) that is surrounded by magnetic shields, including laterally disposed side shields (SS), a trailing shield (TS) and a leading shield (LS). The leading shield includes a leading-edge taper (LET) that conformally abuts a tapered side of the write pole. The leading-edge shield and the leading-edge taper can be independently recessed in a proximal direction away from an air bearing surface (ABS) plane so that one or the other of them is recessed and the other remains coplanar with the ABS, or both are recessed by independent amounts. In another configuration the LS is not planar but has a recessed portion in a center track region and two surrounding regions that are coplanar with the ABS plane.
    Type: Application
    Filed: March 30, 2022
    Publication date: July 14, 2022
    Inventors: Ying Liu, Yuhui Tang, Yue Liu, Kei Hirata
  • Patent number: 11295767
    Abstract: A PMR (perpendicular magnetic recording) write head includes a main write pole (MP) that is surrounded by magnetic shields, including laterally disposed side shields (SS), a trailing shield (TS) and a leading shield (LS). The leading shield includes a leading-edge taper (LET) that conformally abuts a tapered side of the write pole. The leading-edge shield and the leading-edge taper can be independently recessed in a proximal direction away from an air bearing surface (ABS) plane so that one or the other of them is recessed and the other remains coplanar with the ABS, or both are recessed by independent amounts. In another configuration the LS is not planar but has a recessed portion in a center track region and two surrounding regions that are coplanar with the ABS plane.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: April 5, 2022
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Yuhui Tang, Yue Liu, Kei Hirata
  • Publication number: 20210139679
    Abstract: The invention provides a peroxide crosslinkable rubber composition including a hydrogenated nitrile rubber that is enhanced in scorch stability without deterioration in superior characteristics of crosslinked products of the composition. The invention also provides a crosslinked product of such a rubber composition. The rubber composition includes 100 parts by mass of a hydrogenated nitrile rubber (A), 5 to 100 parts by mass of a filler (B), 1 to 10 parts by mass of an organic peroxide (C), and 1 to 20 parts by mass of a liquid diene rubber (D) having a polystyrene-equivalent weight average molecular weight of 3,000 to 120,000 as measured by gel permeation chromatography (GPC).
    Type: Application
    Filed: June 21, 2019
    Publication date: May 13, 2021
    Inventors: Yosuke UEHARA, Kei HIRATA
  • Patent number: 10839829
    Abstract: A magnetic head includes a medium facing surface, a coil, a main pole, and a substrate. The main pole includes a first layer, and a second layer lying on the first layer. The first layer includes a thickness-changing portion whose dimension in a direction perpendicular to a top surface of the substrate decreases with decreasing distance to the medium facing surface. At least part of the second layer is located on the thickness-changing portion.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: November 17, 2020
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Tetsuya Roppongi, Kei Hirata, Atsushi Yamaguchi, Michitaka Nishiyama
  • Patent number: 10781298
    Abstract: 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: Grant
    Filed: May 24, 2017
    Date of Patent: September 22, 2020
    Assignees: KURARAY CO., LTD., AMYRIS, INC.
    Inventors: Daisuke Koda, Kei Hirata
  • Publication number: 20200176021
    Abstract: A PMR (perpendicular magnetic recording) write head includes a main write pole (MP) that is surrounded by magnetic shields, including laterally disposed side shields (SS), a trailing shield (TS) and a leading shield (LS). The leading shield includes a leading-edge taper (LET) that conformally abuts a tapered side of the write pole. The leading-edge shield and the leading-edge taper can be independently recessed in a proximal direction away from an air bearing surface (ABS) plane so that one or the other of them is recessed and the other remains coplanar with the ABS, or both are recessed by independent amounts. In another configuration the LS is not planar but has a recessed portion in a center track region and two surrounding regions that are coplanar with the ABS plane.
    Type: Application
    Filed: December 4, 2018
    Publication date: June 4, 2020
    Inventors: Ying Liu, Yuhui Tang, Yue Liu, Kei Hirata
  • Patent number: 10665391
    Abstract: Disclosed herein is an apparatus that includes a bottom electrode, a top electrode, and a dielectric film disposed between the bottom electrode and the top electrode. The bottom electrode includes TiN having more (111) crystal orientation than (200) crystal orientation.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: May 26, 2020
    Assignee: Micron Technology, Inc.
    Inventor: Kei Hirata
  • Patent number: 10586558
    Abstract: A magnetic head includes a main pole and a write shield. The write shield includes a bottom shield, a first side shield and a second side shield. The first side shield has first and second sidewalls. The second side shield has third and fourth sidewalls. Each of the second and fourth sidewalls has a top edge farthest from a top surface of a substrate. The top edge of each of the second and fourth sidewalls is parallel to a medium facing surface. A portion of a top surface of the bottom shield, the first sidewall, and the third sidewall define a receiving section to receive a portion of the main pole. The receiving section has a bottom including a first inclined portion, a second inclined portion, and a third inclined portion.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: March 10, 2020
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Hironori Araki, Atsushi Yamaguchi, Kei Hirata
  • Patent number: 10550248
    Abstract: 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: Grant
    Filed: August 11, 2014
    Date of Patent: February 4, 2020
    Assignees: KURARAY CO., LTD., AMYRIS, INC.
    Inventors: Daisuke Koda, Kei Hirata
  • Patent number: 10522178
    Abstract: A PMR writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, lead edge taper (LET), and side shields are comprised of a low moment high damping (LMHD) magnetic material having a damping constant ?0.04 and a magnetic flux density (Bs) from 1 kilogauss (kG) to 8 kG. The LMHD magnetic material may be FeNiM, FeCoM, FeNM, or FeCoNiM where M is a 3d, 4d, or 5d transition metal. The LET layer has a tapered side adjoining the leading gap and with a thickness that decreases to zero at height h1 of 50 nm to 500 nm from the air bearing surface. The leading shield also has a backside at h1. Wide adjacent track erasure is minimized while area density capability is enhanced compared with conventional shields with Bs from 10-19 kG.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: December 31, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Yue Liu, Kei Hirata, Yuhui Tang
  • Patent number: 10490210
    Abstract: A PMR writer is disclosed with a leading shield in which a lower (LS2) layer, a middle LS1 layer, and an upper leading edge taper (LET) layer have a damping parameter?0.04, and extend from an air bearing surface (ABS) to a first height (h1) from the ABS. The LS2 layer has a notch filled with dielectric material at the air bearing surface (ABS) that extends to a height?h1, or may be completely replaced with dielectric material. Two notch front sides each form an angle ? with the LS1 bottom surface, and two notch inner sides between the ABS and LS2 backside form angle ? with the ABS where each of ? and ? is from 10 degrees to 170 degrees. Accordingly, bits per square inch performance is improved while substantially maintaining tracks per square inch capability for an overall gain in area density capability.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: November 26, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Yue Liu, Kei Hirata, Yuhui Tang
  • Patent number: 10414834
    Abstract: There are provided a modified liquid diene rubber that can be used for a curable resin composition and a resin composition containing the modified liquid diene rubber. The curable resin composition containing the modified liquid diene rubber has a much higher curing rate than that in the related art, and the resulting cured product has excellent mechanical properties, transparency, and heat resistance. Produced are a modified liquid diene rubber and a resin composition containing the modified liquid diene rubber. The modified liquid diene rubber includes a modifying group (p) partly containing a (meth)acryloyl group therein and a monomer unit (a1) derived from a conjugated diene compound. A carbon-carbon double bond derived from the conjugated diene compound has a hydrogenation rate of 30 to 95 mol %, and the modifying group (p) has a functional group equivalent weight of 700 to 20,000 g/eq.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: September 17, 2019
    Assignee: KURARAY CO., LTD.
    Inventors: Satoshi Motoda, Kei Hirata
  • Patent number: 10370525
    Abstract: [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: Grant
    Filed: March 10, 2015
    Date of Patent: August 6, 2019
    Assignee: KURARAY CO., LTD.
    Inventors: Daisuke Koda, Kei Hirata
  • Patent number: 10339964
    Abstract: A perpendicular magnetic recording writer is disclosed wherein a first trailing shield (HMTS) layer has a down-track (DT) thickness d in portions thereof proximate to a center plane that bisects the main pole tip trailing side to enable enhanced trailing shield return field at track center thereby improving bits per inch (BPI) capability. Meanwhile, at off track center positions, that in some embodiments are from 25 nm to 500 nm from the center plane, the HMTS layer has a DT thickness d1, where d1>d, and a smaller dielectric gap between the HMTS layer and the main pole thereby protecting side shield return field and adjacent track interference (ATI) performance. A method of forming the HMTS layer on a write gap is provided and includes patterning the HMTS layer in a back portion to form openings that are filled with the smaller dielectric gap and HTMS layer thickness d1.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: July 2, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Yue Liu, Yuhui Tang, Kei Hirata
  • Patent number: 10297277
    Abstract: A magnetic head includes a coil, and a magnetic path forming section for defining a first space for a portion of the coil to pass through. The magnetic path forming section includes a core section. The coil includes a first winding portion and a second winding portion connected in series. The first winding portion includes one or two first coil elements extending to pass through the first space, and extends once or twice around the entire perimeter of the core section. The second winding portion does not pass through the first space, and extends less than once around the entire perimeter of the core section to rotate n degrees about a center point of the core section, where n is greater than 270 and smaller than 360.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: May 21, 2019
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Atsushi Yamaguchi, Kei Hirata
  • Publication number: 20190148067
    Abstract: Disclosed herein is an apparatus that includes a bottom electrode, a top electrode, and a dielectric film disposed between the bottom electrode and the top electrode. The bottom electrode includes TiN having more (111) crystal orientation than (200) crystal orientation.
    Type: Application
    Filed: November 13, 2017
    Publication date: May 16, 2019
    Applicant: Micron Technology, Inc.
    Inventor: Kei Hirata
  • Patent number: 10227481
    Abstract: 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: Grant
    Filed: March 25, 2014
    Date of Patent: March 12, 2019
    Assignee: KURARAY CO., LTD.
    Inventors: Daisuke Koda, Kei Hirata, Hiroshi Kanbara
  • Publication number: 20180022835
    Abstract: There are provided a modified liquid diene rubber that can be used for a curable resin composition and a resin composition containing the modified liquid diene rubber. The curable resin composition containing the modified liquid diene rubber has a much higher curing rate than that in the related art, and the resulting cured product has excellent mechanical properties, transparency, and heat resistance. Produced are a modified liquid diene rubber and a resin composition containing the modified liquid diene rubber. The modified liquid diene rubber includes a modifying group (p) partly containing a (meth)acryloyl group therein and a monomer unit (a1) derived from a conjugated diene compound. A carbon-carbon double bond derived from the conjugated diene compound has a hydrogenation rate of 30 to 95 mol %, and the modifying group (p) has a functional group equivalent weight of 700 to 20,000 g/eq.
    Type: Application
    Filed: December 22, 2015
    Publication date: January 25, 2018
    Applicant: KURARAY CO., LTD.
    Inventors: Satoshi MOTODA, Kei HIRATA
  • Patent number: 9850336
    Abstract: 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: Grant
    Filed: April 2, 2013
    Date of Patent: December 26, 2017
    Assignees: KURARAY Co., Ltd., AMYRIS, INC.
    Inventors: Daisuke Koda, Kei Hirata