Patents Assigned to The Yokohama Rubber
  • Patent number: 12384203
    Abstract: A tire tread includes a pair of first circumferential main grooves in a first half-tread region on one side in a tire width direction, a pair of second circumferential main grooves in a second half-tread region, first sipes provided in a first region between the first circumferential main grooves, a circumferential narrow groove having a groove width smaller than a groove width of the first circumferential main groove and extending in the tire circumferential direction within the first region, and sipes in a second region between the second circumferential main grooves, extending in the tire width direction, and closing within the second region. The number of intervals of the second sipes mutually adjacent is larger than the number of intervals of the first sipes mutually adjacent.
    Type: Grant
    Filed: December 7, 2020
    Date of Patent: August 12, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Kenichi Matsumoto
  • Patent number: 12377681
    Abstract: A pneumatic tire includes a tread portion composed of a tread rubber composition containing silica. The pneumatic tire exhibits improved processability over time without negatively affecting the wet grip properties and rolling resistance of the tread rubber composition. The tread portion includes a tread rubber composition including: 50 parts by mass to 90 parts by mass of silica, per 100 parts by mass of diene rubber containing 30 mass % to 90 mass % of a terminal-modified diene rubber; an alkylsilane; a fatty acid metal salt a containing an alkali metal element; and a fatty acid ester; and by further compounding, at an amount of 5 mass % to 12 mass % with respect to the silica amount, a sulfur-containing silane coupling agent not containing a mercapto group.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: August 5, 2025
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Keisuke Murase
  • Patent number: 12377689
    Abstract: A surface of a sidewall portion of a pneumatic tire includes: a ridge pattern region provided with a plurality of ridges extending continuously in one direction at an interval, a smooth surface region composed of a smooth surface, and a two-dimensional code having a rectangular shape in which a dot pattern is formed of two kinds of gray scale elements that are formed distinguishable from each other by unevenness of a surface. The two-dimensional code is provided in the smooth surface region, and a shortest distance Lmin at a position where a distance from the ridge pattern region to the two-dimensional code is the shortest distance Lmin among four sides of the rectangular shape of the two-dimensional code is from 3 to 25% of a length W of one side, of the two-dimensional code, the one side having the position where the distance of the two-dimensional code is the shortest distance Lmin.
    Type: Grant
    Filed: January 15, 2019
    Date of Patent: August 5, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Takashi Hoshiba, Mizuki Kuninaka, Noriyoshi Koyama
  • Patent number: 12377682
    Abstract: A pneumatic tire comprises a carcass layer, a belt layer radially outward of the carcass layer, and a tread rubber radially outward of the belt layer. The belt layer is formed by laminating a large angle belt having a belt-cord angle of 45°-70°, a pair of cross belts having belt cord angles of 10°-45° with opposite sign belt cord angles, and a reinforcing layer having a belt cord angle satisfying ±5° relative to a circumferential direction. A reinforcing layer width Ws and a carcass cross-sectional width Wca satisfy 0.60?Ws/Wca?0.70. A wider cross belt width Wb2 of the pair of cross belts and the carcass width Wca satisfy 0.79?Wb2/Wca?0.89. Relationships 0.79?Wb2/Wca?0.84 and either 0.82?TW/Wca?0.92 or 0.79?TW/SW?0.89 are satisfied, where TW is a tread width and SW is a total tire width.
    Type: Grant
    Filed: March 29, 2022
    Date of Patent: August 5, 2025
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Hideki Hamanaka
  • Patent number: 12365205
    Abstract: In a pneumatic tire, a bead filler is on an outer circumference of a bead core, a carcass turned up end is inward of an outer diameter side end of the bead filler, the carcass end is spaced from a carcass body, a steel reinforcement is in each bead, a sidewall rubber extends from the sidewall to the bead, and a support layer is between the bead filler and the sidewall rubber to cover the carcass end and an end of the steel reinforcement, the support layer extending toward an outer diameter side and contacting the carcass body on an outer diameter side of the bead filler outer diameter side end, and a 100% modulus of the support layer is at least 1.5 times that of the bead filler, and the sidewall rubber, the bead filler and the sidewall rubber being adjacent to the support layer.
    Type: Grant
    Filed: October 7, 2019
    Date of Patent: July 22, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Koji Nishio
  • Patent number: 12365204
    Abstract: In a pneumatic tire, a bead core has end portions in a tire width direction formed as vertical lines along a tire radial direction. A length of the vertical lines is from 20% to 30% of a core height. In two adjacent bead core layers of first, second and third layers, the radial outer layer tire includes two or more bead cores more than the radially inner layer tire, and a misalignment amount between the bead wires each at an end portion on one side in the tire width direction is one-half of a bead wire thickness. A side on which the misalignment amount between the first and second layer bead wires is one-half of the thickness of the bead wire is opposite in the tire width direction to a side on which the misalignment amount between the second and third layer bead wires is one-half of the thickness of the bead wire.
    Type: Grant
    Filed: March 2, 2021
    Date of Patent: July 22, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Takanori Ito, Hiroaki Honda, Mari Shimizu, Mingquan Wang, Feng Gao, Jingwei Huang, Niancun Wang, Yulong Li, Jiang Wu, Xiquan Jia, Yuchao Jiao
  • Patent number: 12365786
    Abstract: A surface-treated nanocellulose master batch includes a rubber component, a nanocellulose, a resole or novolac resorcin-formaldehyde initial condensation product, and formaldehyde. The the surface-treated nanocellulose master batch includes from 0.3 to 15 parts by mass of the nanocellulose per 100 parts by mass of the rubber component. The the surface-treated nanocellulose master batch includes from 0.03 to 1.2 parts by mass of the resole or novolac resorcin-formaldehyde initial condensation product per 1 part by mass of the nanocellulose and 0.02 to 0.8 parts by mass of the formaldehyde per 1 part by mass of the nanocellulose.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: July 22, 2025
    Assignees: THE YOKOHAMA RUBBER CO., LTD., SHINSHU UNIVERSITY
    Inventors: Masayuki Kawazoe, Tomoyuki Sakai, Toru Noguchi
  • Patent number: 12365547
    Abstract: A temperature detection device and method that can simply and accurately detect the presence or absence of abnormal heating of a conveyor belt. Correlation data between an electrical resistance value of a passive IC tag embedded in a conveyor belt and a temperature of the IC tag when it is activated is grasped in advance when the tag receives a transmitted radio wave from a non-contact detector. Data of electrical resistance value when the IC tag is activated is received by the detector through a returned radio wave returned from the tag in response to the transmitted radio wave transmitted from the detector toward the tag embedded in the conveyor belt running. A temperature at a position of the conveyor belt where the tag is embedded is calculated in accordance with the data of the electrical resistance value received and the correlation data.
    Type: Grant
    Filed: September 15, 2021
    Date of Patent: July 22, 2025
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Yusuke Ishibashi
  • Patent number: 12358326
    Abstract: A pneumatic tire includes a plurality of main grooves and a land portion defined by the main grooves. Further, the main groove includes a rib-shaped protrusion portion protruding from a groove bottom of the main groove and extending in a tire width direction, and being coupled to a groove wall of the main groove at, at least, one end. Further, a maximum height H1 of the protrusion portion has a relationship 0.01?H1/Hg?0.20 with respect to a groove depth Hg of the main groove. Further, the maximum height H1 of the protrusion portion is in a range H1?1.6 mm.
    Type: Grant
    Filed: November 16, 2020
    Date of Patent: July 15, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Hiroyuki Yoshida
  • Patent number: 12358324
    Abstract: A pneumatic tire includes undertread layer made of a rubber composition obtained by blending, per 100 parts by mass of diene rubber, 15 parts by mass to 45 parts by mass of carbon black having a nitrogen adsorption specific surface area N2SA of 20 m2/g to 85 m2/g and a DBP absorption of 90 mL/100 g to 200 mL/100 g, 3 parts by mass to 30 parts by mass of silica, and a silane coupling agent in an amount of 5 mass % to 15 mass % of the silica. A ratio is calculated based on a hardness Hu of an undertread rubber and an elastic modulus Ec and a hardness Hc of a cap tread rubber, is set to 110 to 140. A proportion iof a thickness G2 of the undertread layer to an under-groove rubber gauge G1, is set to 0.55 or more and 0.80 or less.
    Type: Grant
    Filed: March 18, 2022
    Date of Patent: July 15, 2025
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Takuma Ishida
  • Patent number: 12350969
    Abstract: In a pneumatic tire, an outer second land portion, a center land portion, and an inner second land portion have a road contact surface that partially bulges toward the outer side in a tire radial direction from a reference contour line of a tread profile in the cross-sectional view in the tire meridian direction. Additionally, a groove width Wg1 of an outer shoulder main groove, a groove width Wg3 of an inner center main groove, and a groove width Wg4 of an inner shoulder main groove have a relationship of Wg3<Wg1<Wg4, 1.05?Wg1/Wg3?1.25, and 1.10?Wg4/Wg3?1.30.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: July 8, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Daichi Sugiyama
  • Patent number: 12350975
    Abstract: Provided are a tire casing life management system and a tire casing life management method. A casing life management system includes a temperature sensor that measures the temperature of a tire, a heat history amount calculation unit that calculates a heat history amount received by the tire during a first period, on the basis of a plurality of pieces of temperature information of the tire measured during the first period of at least one day, an accumulation heat amount estimation unit that estimates an accumulation heat amount which can be received by the tire during the second period set for one year, on the basis of the heat history amount in the first period, and a casing life prediction unit that predicts the remaining life period of the casing from the accumulation heat amount in the second period and a predetermined threshold.
    Type: Grant
    Filed: April 1, 2021
    Date of Patent: July 8, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Hiroshi Iizuka
  • Patent number: 12350973
    Abstract: A tire tread pattern includes a center land portion and an intermediate land portion on an outer side in a width direction thereof. A center land portion region includes no grooves, includes a first sipe having a wide width open to circumferential main grooves on both sides and includes a second sipe having a narrow width between adjacent first sipes and open to the circumferential main grooves on both sides. An intermediate land portion region includes an intermediate lug groove opening to a circumferential main groove in contact with the intermediate land portion. A circumferential direction distance between opening ends of the adjacent first sipes is equal to a distance between opening ends of adjacent intermediate lug grooves in which the region between at least some opening ends in the circumferential direction overlaps the region along the circumferential direction between the opening ends of the adjacent first sipes.
    Type: Grant
    Filed: June 10, 2020
    Date of Patent: July 8, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Kotaro Matsushita
  • Patent number: 12344040
    Abstract: A pneumatic tire includes two circumferential main grooves disposed in an inner half of a tread developed width in a tire lateral direction; shoulder lug grooves that divide shoulder land portions into shoulder block portions and that each include a see-through portion in the tire lateral direction; and center lug grooves that divide a center land portion into a plurality of center block portions. The center lug grooves each include: two end groove portions opening to the innermost circumferential main grooves and one center groove portion that extends between the end groove portions, has at least a part disposed on a tire equator line, and has an angle ?1 with respect to the tire equator line satisfying ?45°??1?+15°.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: July 1, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Mina Fukuda
  • Patent number: 12344039
    Abstract: A pneumatic tire includes: a center main groove extending in a tire circumferential direction; a center land portion defined by the center main groove; a second land portion adjacent to the center land portion across the center main groove; and a second lug groove extending from the center main groove toward the second land portion in a tire lateral direction and defining the second land portion together with the center main groove; the center main groove including a center side edge portion corresponding to an edge portion on the center land portion side, the center side edge portion including a bent portion formed bent in a direction outwards in a groove width direction of the center main groove with an acute bend angle; and the second lug groove including an opening portion to the center main groove connected to the center main groove at a position opposing the bent portion.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: July 1, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Ryosuke Nukushina
  • Patent number: 12344041
    Abstract: In a pneumatic tire, a center land portion includes a plurality of center lug grooves and a plurality of center blocks. The plurality of center lug grooves penetrate the center land portion. The plurality of center blocks are defined by the plurality of center lug grooves. A middle land portion includes a plurality of middle lug grooves, a plurality of middle blocks, a notch portion, and a middle sipe. The plurality of middle lug grooves penetrate the middle land portion. The plurality of middle blocks are defined by the plurality of middle lug grooves. The notch portion is an edge portion on the center main groove side of each of the plurality of middle blocks and formed on an extension line of each of the plurality of center lug grooves. The middle sipe extends from the notch portion and opens to an edge portion on the shoulder main groove side.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: July 1, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Reika Tokunaga
  • Patent number: 12337619
    Abstract: A tire includes first through fourth chamfered portions where tire width direction dimensions change in a tire circumferential direction formed along respective vehicle mounting outer edges of first through fourth circumferential main grooves. A second inclined groove adjacent to a vehicle mounting outermost position of the second chamfered portion is formed. A third inclined groove adjacent to a vehicle mounting outermost position of the third chamfered portion is formed. At least one circumferential narrow groove extending in the tire circumferential direction is formed in at least one of a first land portion and a second land portion.
    Type: Grant
    Filed: December 21, 2020
    Date of Patent: June 24, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Ryohei Takemori
  • Patent number: 12337558
    Abstract: Provided is a sealant material composition that can ensure good sealing properties while suppressing a flow of a sealant during travel and that can provide such performance in a well-balanced, compatible manner. As a sealant material composition constituting a sealant layer (10) disposed in an inner surface of a pneumatic tire, a sealant material composition in which a proportion (A) of toluene insoluble occupying the sealant material composition is from 30 mass % to 60 mass % is used, or a sealant material composition in which a ratio (d1/d2) of measured specific gravity (d1) of the sealant material composition measured by an underwater replacement method to calculated specific gravity (d2) of the sealant material composition calculated from specific gravity and a blended amount of each raw material in the sealant material composition is from 0.7 to 0.9 is used.
    Type: Grant
    Filed: August 16, 2021
    Date of Patent: June 24, 2025
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Kiyohito Takahashi
  • Patent number: 12337618
    Abstract: Provided is a pneumatic tire with wet steering stability performance and dry steering stability performance enhanced in a well-balanced manner. A dimple group is composed of a plurality of dimples (100 to 104) disposed at intervals and aligned in a tire circumferential direction. When the minimum center-to-center distance between different dimples (100, 102) in an identical dimple group is defined as K and the minimum center-to-center distance between dimples (104, 100) in different dimple groups is defined as L, the ratio L/K is 3.5 or more and 10.0 or less and the minimum center-to-center distance L is 20 mm or more and equal to or less than a ground contact length.
    Type: Grant
    Filed: May 12, 2020
    Date of Patent: June 24, 2025
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Hiraku Koda, Ryohei Takemori, Yuki Sasaya
  • Patent number: D1083754
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: July 15, 2025
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Noboru Kuwahara, Mizuki Kuninaka