Patents Assigned to Bridgestone Corporation
  • Tire
    Patent number: 11673430
    Abstract: Provided is a tire including: a decorative portion that is formed on an outer surface of the tire and has a base surface; and a pattern region that is provided at the decorative portion and includes plural projections projecting from the base surface and formed at an interval of from more than 0.1 mm to 1.0 mm, the plural projections having a height of from 0.1 mm to 1.0 mm, in which at least in the pattern region, the plurality of projections is inclined in one direction with respect to a normal line perpendicular to the base surface.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: June 13, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Sotaro Iwabuchi, Takayuki Fukunaga
  • ADHESIVE COMPOSITION FOR ORGANIC FIBER CORD, RUBBER-ORGANIC FIBER CORD COMPOSITE, AND TIRE
    Publication number: 20230174833
    Abstract: The present disclosure provides: an adhesive composition capable of realizing good adhesion even when neither resorcin nor formalin is included therein; and a rubber-organic fiber cord composite and a tire, which are excellent in adhesion between rubber and organic fiber cords and make a low impact on the environment. Specifically, the present invention provides an adhesive composition for an organic fiber cord, comprising therein: an epoxy compound (A); a compound (B) having an amide group and an amino group per molecule; and rubber latex (C). Further, the present disclosure provides a rubber-organic fiber cord composite, comprising a rubber member and an organic fiber cord, wherein at least a portion of the organic fiber cord is coated with the adhesive composition described above.
    Type: Application
    Filed: April 27, 2021
    Publication date: June 8, 2023
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shingo ONOUE, Masaaki KAKAMURA
  • RUBBER COMPOSITION AND TIRE
    Publication number: 20230174751
    Abstract: Provided is a rubber composition having excellent wear resistance while having good low heat generating properties. The rubber composition contains a rubber component and carbon black, where the rubber component contains natural rubber and butadiene rubber, a proportion of the natural rubber is less than 80% by mass, a content of the carbon black is 40 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the rubber component, and when carbon blacks A, B and C are defined under predetermined conditions, the carbon black contains at least the carbon black A and the carbon black B, and a content of the carbon black C is 0 or the smallest among the carbon blacks A to C.
    Type: Application
    Filed: March 10, 2021
    Publication date: June 8, 2023
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Kei MITO, Toru MIYAZAKI
  • TIRE
    Publication number: 20230173850
    Abstract: A tire includes a first circumferential main groove 11 and a second circumferential main groove 12 in a tread surface 1. A resonator 21 is formed in an intermediate land portion 20 partitioned between the first circumferential main groove and the second circumferential main groove. The resonator has an auxiliary groove 211 whose both ends terminate within the intermediate land portion. The groove depths D1 of the first and second circumferential main grooves are 50% or less of the groove widths W2 of the first and second circumferential main grooves, respectively. The groove depth D3 of the auxiliary groove of the resonator is 70% or more of the groove depth D1 of the first circumferential main groove.
    Type: Application
    Filed: May 6, 2021
    Publication date: June 8, 2023
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yoshiki NAKATA, Mayuko KARASAWA
  • Rubber vulcanization processes employing an eutectic mixture
    Patent number: 11667774
    Abstract: A process for preparing a rubber vulcanizate, the process comprising (i) providing a vulcanizable composition of matter including a sulfur-based curative, zinc oxide, and a eutectic solvent; and (ii) heating the vulcanizable composition to thereby effect vulcanization.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: June 6, 2023
    Assignee: Bridgestone Corporation
    Inventors: Erin Sheepwash, Julia A. Dart, Michael C. Davis
  • PNEUMATIC RADIAL TIRE FOR AIRCRAFT
    Publication number: 20230166562
    Abstract: A pneumatic radial tire for aircraft in the present disclosure includes a bead core formed by a pair of cable beads embedded in a respective pair of bead portions, a pair of bead fillers respectively arranged outward in a tire radial direction from the pair of bead cores, and a carcass formed by two or more carcass plies that extend toroidally between the pair of bead cores. In a tire widthwise cross-sectional view, an end of a carcass ply, among the two or more carcass plies, closest to the bead filler in a region inward in a tire width direction from the bead filler is located in a region corresponding to 45° to 90° inward in the tire width direction when 0° is defined as outward in the tire radial direction from a center of the bead core.
    Type: Application
    Filed: December 17, 2020
    Publication date: June 1, 2023
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Gaku OGAWA, Takuya MATSUMOTO
  • Tire wear estimation method
    Patent number: 11662272
    Abstract: A method for efficiently estimating a degree of wear of a tire in which a normalized deformation speed index is set as a wear measure. The normalized deformation speed index is obtained by normalizing an index of a deformation speed near an edge of a tire contact patch, the index being calculated from magnitudes of peaks appearing in a radial acceleration waveform obtained by differentiating tire radial acceleration detected by an acceleration sensor. The degree of wear of the tire is estimated using the wear measure, the ground contact time ratio, a worn tire approximate formula and an approximate formula when a tire is new, which have been obtained in advance and each represents a relationship between the wear measure and the ground contact time ratio obtained by running a plurality of tires having tire sizes different from each other.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: May 30, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Kenta Nishiyama
  • Nonpneumatic tire
    Patent number: 11654716
    Abstract: An object of the present disclosure is to provide a non-pneumatic tire having a small temperature dependence of ride comfort, providing a good ride comfort over a wide temperature range, and having an excellent durability. A solution thereto is a non-pneumatic tire (1) using a resin composition for a framework member, the resin composition having a bending modulus of elasticity at ?20° C. according to ISO 178 of 1600 MPa or less, and a bending modulus of elasticity at 60° C. according to ISO 178 of 150 MPa or more.
    Type: Grant
    Filed: May 8, 2020
    Date of Patent: May 23, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Sinichi Eguchi
  • Rubber composition and tire
    Patent number: 11655356
    Abstract: Provided is a rubber composition that can achieve excellent breaking resistance while having high operability. A rubber composition comprises: a rubber component containing a multicomponent copolymer that contains a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit; and an ?-olefin having a number-average molecular weight (Mn) of 50 to 1,000.
    Type: Grant
    Filed: July 31, 2019
    Date of Patent: May 23, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Yasuhiro Shoda
  • Modified conjugated diene-based polymer, rubber composition, tire, and method of producing modified conjugated diene-based polymer
    Patent number: 11655321
    Abstract: Provided is a modified conjugated diene-based polymer, a rubber composition and a tire with excellent low loss property and durability, and a method of producing a modified conjugated diene-based polymer with which the presently disclosed modified conjugated diene-based polymer can be produced. The modified conjugated diene-based polymer has two or more modifying groups in one modified conjugated diene-based polymer molecule, where the modifying groups between molecules have a non-covalent bond with energy of 10 kJ/mol to 250 kJ/mol. The rubber composition contains the modified conjugated diene-based polymer. The tire uses the rubber composition.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: May 23, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Takatsugu Tanaka, Rika Fukushima
  • RUBBER COMPOSITION AND RUBBER PRODUCT
    Publication number: 20230151132
    Abstract: Provided is a rubber composition that can improve the balance between the hysteresis loss of rubber at low strain and the hysteresis loss of rubber at high strain. The rubber composition comprises a rubber component, and at least one compound selected from the group consisting of the general formulas (1) and (2), HS—R—COOM??(1), and MOCO—R—(S)n—R—COOM??(2), where R is independently a linear or branched hydrocarbylene group having 8 or more carbon atoms in a linear portion connecting the sulfur atom and the COOM group; M is independently an atom selected from the group consisting of an alkali metal and an alkaline earth metal; and n is an integer from 2 to 8.
    Type: Application
    Filed: April 15, 2021
    Publication date: May 18, 2023
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Tomoyuki KOSAI
  • WEAR STATE PREDICTION METHOD, WEAR STATE PREDICTION DEVICE, AND WEAR STATE PREDICTION PROGRAM
    Publication number: 20230150314
    Abstract: A wear state prediction device (10) is provided with a model generation unit (124) which generates a model for predicting a wear state as an objective variable by using a predetermined algorithm in which air temperature data on an aircraft (31) acquired in advance is set as an explanatory variable, and a wear state prediction unit (133) which inputs air temperature data to the model generated by the model generation unit (124) and predicts the wear state.
    Type: Application
    Filed: February 22, 2021
    Publication date: May 18, 2023
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Ryo HANADA
  • High Strength Hydrogenated Polymers, And Rubber Compositions Incorporating Same
    Publication number: 20230134110
    Abstract: Embodiments of the present disclosure are directed to functionalized copolymers produced by copolymerization of at least one conjugated diolefin monomer and at least one vinyl monomer, the functionalized copolymer comprising at least one functional group having silica reactive moieties, wherein the functionalized copolymer has a degree of hydrogenation of 75% to 98 mol % as measured using proton nuclear magnetic resonance spectroscopy (1H NMR).
    Type: Application
    Filed: December 21, 2017
    Publication date: May 4, 2023
    Applicant: Bridgestone Corporation
    Inventors: Michael R. Beaulieu, Noriaki Yukimura, Zengquan Qin
  • Terminal-functionalized polymer, rubber composition containing same and related processes
    Patent number: 11639409
    Abstract: Disclosed herein are a terminal-functionalized polymer, rubber compositions containing the polymer, and related processes for preparing the polymer. The functionalizing compound used to prepare the terminal-functionalized polymer has a specified formula which includes a silicon atom and a moiety containing at least two carbon-carbon double bonds in a conjugated configuration.
    Type: Grant
    Filed: June 7, 2021
    Date of Patent: May 2, 2023
    Assignee: Bridgestone Corporation
    Inventor: Yuan-Yong Yan
  • TIRE/WHEEL ASSEMBLY
    Publication number: 20230117713
    Abstract: A tire/wheel assembly of the present disclosure includes a tire with a tread portion and a wheel with a rim. The tire is mounted on the rim, and the tire/wheel assembly includes a power reception coil. In the contact patch when the tire/wheel assembly is filled to a prescribed internal pressure and subjected to the maximum load, the rectangle ratio of the ground contact length at a position, in the tire width direction, located 10% of the ground contact width inward in the tread width direction from an edge in the tire width direction to the ground contact length at the center of the contact patch in the tire width direction is 50% or more.
    Type: Application
    Filed: September 10, 2020
    Publication date: April 20, 2023
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Isao KUWAYAMA
  • Tire tread
    Patent number: D986149
    Type: Grant
    Filed: May 27, 2020
    Date of Patent: May 16, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Yuya Ogawa
  • Tire tread
    Patent number: D986150
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: May 16, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Fumitaka Kobayashi, Yusuke Nakai
  • Tire tread
    Patent number: D986152
    Type: Grant
    Filed: April 19, 2021
    Date of Patent: May 16, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Reo Nakasato
  • Tread portion of an automobile tire
    Patent number: D986157
    Type: Grant
    Filed: March 3, 2021
    Date of Patent: May 16, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Hidenori Ogawa
  • Tire tread
    Patent number: D986804
    Type: Grant
    Filed: August 3, 2021
    Date of Patent: May 23, 2023
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Akira Hishigae