Patents Assigned to The Yokohama Rubber Co., Ltd.
  • Publication number: 20210213786
    Abstract: In a pneumatic tire including main grooves extending in a tire circumferential direction in a tread portion, and including a sipe extending in a tire lateral direction on a rib defined by the main grooves, the sipe includes an edge on a leading side and an edge on a trailing side, chamfered portions shorter than a sipe length of the sipe are formed on respective edges, non-chamfered regions on which no other chamfered portion exists exist on portions opposing to respective chamfered portions in the sipe, a maximum depth x (mm) of the sipe and a maximum depth y (mm) of the chamfered portion satisfy x×0.1?y?x×0.3+1.0, and a sipe width of the sipe is constant in a range from an end portion positioned inside in a tire radial direction of the chamfered portion to a groove bottom of the sipe.
    Type: Application
    Filed: February 14, 2017
    Publication date: July 15, 2021
    Applicant: The Yokohama Rubber Co., LTD.
    Inventors: Hiraku Kouda, Tatsuro Shinzawa, Takanori Uemura
  • Patent number: 11040572
    Abstract: A rubber composition for a tire contains 100 parts by mass of a diene rubber (A) and from 1 to 60 parts by mass of an organic microparticle (B); an average particle size of the organic microparticle (B) being from 0.001 to 100 ?m, the organic microparticle (B) having a complex structure composed of a compatible component that is compatible with the diene rubber (A) and an incompatible component that is not compatible with the diene rubber (A), the complex structure having an inner part in which an amount of the incompatible component is greater than an amount of compatible component, and an outer part which covers at least a part of the inner part and in which the amount of the compatible component is greater than an amount of the incompatible component. A pneumatic tire including such rubber composition has a desirable elongation, rigidity, durability, and wear resistance.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: June 22, 2021
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazushi Kimura, Hirokazu Kageyama, Satoshi Mihara
  • Patent number: 11008445
    Abstract: The present invention is to provide an aromatic vinyl-diene copolymer which exhibits excellent mechanical properties and wear resistance when being formed into a tire, a method for producing the aromatic vinyl-diene copolymer, and a rubber composition containing the aromatic vinyl-diene copolymer. The aromatic vinyl-diene copolymer of an embodiment of the present invention is an aromatic vinyl-diene copolymer which is a copolymer of an aromatic vinyl and a diene, wherein the content of a repeating unit derived from an aromatic vinyl is 18 mass % or greater, among repeating units derived from a diene, a proportion of a vinyl structure is 8 mol % or less, a proportion of a 1,4-trans structure is 75 mol % or less, and a proportion of a 1,4-cis structure is from 17 to 90 mol %, and a glass transition temperature is ?60° C. or lower.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: May 18, 2021
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuya Uenishi, Makoto Ashiura, Motoji Fujita, Naoya Amino, Satoshi Mihara, Yu Shinke
  • Patent number: 11001654
    Abstract: The present invention is to provide a diene polymer that exhibits excellent low rolling resistance when used in a tire, a method for producing the diene polymer, and a rubber composition containing the diene polymer. The diene polymer of an embodiment of the present invention is produced by polymerizing a monomer containing at least a diene monomer by using an initiator prepared from an organolithium compound, an alkyl aluminum, and a metal alcoholate, and then terminating the polymerization by using an electrophile selected from the group consisting of titanium halides, tin halides, cyclic silazanes, alkoxysilanes, epoxides, amines, ketones, and compounds represented by Formula (N) below.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: May 11, 2021
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuya Uenishi, Naoya Amino, Makoto Ashiura, Motoji Fujita, Satoshi Mihara, Yu Shinke
  • Patent number: 10988751
    Abstract: A method enables olefin compound production with a high productivity, and an enzyme is used in the method. Mutations involving amino acid substitution are introduced into various sites of diphosphomevalonate decarboxylase (MVD) to prepare multiple MVD variants. Then, these variants are evaluated in terms of catalytic activity for producing an olefin compound such as isoprene, and have found as a result that the catalytic activity is improved when serine at position 153 and threonine at position 209 are each substituted with a different amino acid. In addition, the catalytic activity of the variants is further improved when glycine at position 152 is further substituted with a different amino acid.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: April 27, 2021
    Assignees: RIKEN, ZEON CORPORATION, THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Ryoko Orishimo, Tomokazu Shirai, Kazuhiro Takahashi, Misao Hiza, Yusuke Tanabe
  • Patent number: 10968587
    Abstract: In a pneumatic fender, reinforcing layers of a body portion and reinforcing layers of a predetermined range in the longitudinal direction of a fender near a boundary between each hemispherical portion and the body portion are formed by aligning cords of reinforcing layers of the body portion and that of the predetermined range in parallel, and in a neutral state without expansion, the cords of the reinforcing layers of the body portion meet each other and the cords of the reinforcing layers of the predetermined range meet each other, and cord angles A and B are each set to from 15° to 45° with respect to the longitudinal direction of the fender. When the interior of the fender is set to a specified internal pressure, the cord angles A and B increase to extent of a static angle, and the body portion and the predetermined range expand.
    Type: Grant
    Filed: June 7, 2018
    Date of Patent: April 6, 2021
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kouko Tsuchiya, Minami Shibuya, Keiichi Hasegawa, Gang Hou, Satoshi Shibayama, Akihiro Iemoto, Shunichi Ono, Michito Kaneko
  • Patent number: 10961548
    Abstract: Mutations involving amino acid substitution were introduced into various sites of diphosphomevalonate decarboxylase (MVD), thus preparing a large number of MVD variants. Then, the variants were each evaluated in terms of a catalytic activity for production of olefin compounds such as isoprene. As a result, it was found that substitution of glycine at position with a different amino acid resulted in improvement in the catalytic activity. In addition, it was found that the MVD in which arginine at position and threonine at position in addition to the position were further substituted with different amino acids, respectively, also had the high catalytic activity.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: March 30, 2021
    Assignees: RIKEN, ZEON CORPORATION, THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Ryoko Orishimo, Tomokazu Shirai, Kazuhiro Takahashi, Misao Hiza, Yusuke Tanabe
  • Patent number: D909288
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: February 2, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Noriyoshi Koyama, Hiraku Kouda
  • Patent number: D910048
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: February 9, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Yasuhiko Araki
  • Patent number: D912610
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: March 9, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Hironori Wada
  • Patent number: D914582
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: March 30, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Daichi Sugiyama
  • Patent number: D914584
    Type: Grant
    Filed: April 10, 2019
    Date of Patent: March 30, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Masatoshi Shimizu
  • Patent number: D914587
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: March 30, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Noriyoshi Koyama, Hiraku Kouda
  • Patent number: D915270
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: April 6, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Noboru Kuwahara
  • Patent number: D915271
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: April 6, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Noboru Kuwahara
  • Patent number: D916004
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: April 13, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Noboru Kuwahara
  • Patent number: D920223
    Type: Grant
    Filed: April 10, 2019
    Date of Patent: May 25, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Takanori Uemura, Takashi Hoshiba
  • Patent number: D924786
    Type: Grant
    Filed: April 30, 2020
    Date of Patent: July 13, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Yasutaka Akashi
  • Patent number: D924788
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: July 13, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Noboru Kuwahara
  • Patent number: D924789
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: July 13, 2021
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Kenichi Sato, Hiraku Kouda