Patents by Inventor Isao Kuwayama

Isao Kuwayama 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).

  • Publication number: 20200376892
    Abstract: A pneumatic tire comprising a carcass 11, at least one inclined belt layer 13 having a cord extending inclined at an angle of 30° or more relative to the tire circumferential direction, and a tread 15 arranged outward in the tire radial direction of the inclined belt layer 13, wherein a circumferential cord layer 14 arranged inward in the tire radial direction of the tread 15 has a high-rigidity region and a low-rigidity region and the high-rigidity region has a higher negative ratio in a ground contact width of the tread 15 than the low-rigidity region.
    Type: Application
    Filed: December 22, 2017
    Publication date: December 3, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Isao KUWAYAMA
  • Publication number: 20200376893
    Abstract: A pneumatic tire comprising a carcass 11, at least one inclined belt layer 13 having a cord extending inclined at an angle of 30° or more relative to the tire circumferential direction, and a tread 15 arranged outward in the tire radial direction of the inclined belt layer 13, wherein a circumferential cord layer 14 arranged inward in the tire radial direction of the tread 15 has a high-rigidity region and a low-rigidity region and the high-rigidity region has a lower negative ratio in a ground contact width of the tread 15 than the low-rigidity region.
    Type: Application
    Filed: December 22, 2017
    Publication date: December 3, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Isao KUWAYAMA
  • Patent number: 10836213
    Abstract: A passenger vehicle pneumatic tire comprising: a carcass; and inclined belt layers and a circumferential belt layer, wherein: the inclined belt layers include at least two inclined belt layers having different tire widthwise widths; an inclination angle ?1 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the widest width and an inclination angle ?2 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the narrowest width satisfy correlations that 30°??1?85°, 10°??2?30°, and ?1>?2; and a tire widthwise width W1 of the inclined belt layer having the widest width and a tire widthwise width W2 of the inclined belt layer having the narrowest width satisfy a correlation that W2?0.6W1.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: November 17, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Isao Kuwayama
  • Publication number: 20200198402
    Abstract: A pneumatic tire comprising a carcass 12, at least one inclined belt layer 13, at least one first circumferential cord layer 14 arranged inward in the tire radial direction of the inclined belt layer 13, a tread 16 arranged outward in the tire radial direction of the inclined belt layer 13, and a second circumferential cord layer 15 which is arranged outward in the tire radial direction so as to cover a tire width direction end of the inclined belt layer 13, and where X is defined as X=Y=n×m×d, Y is the Young's modulus (GPa) of the cord, n is the number of cords implanted (cords/50 mm), d is the cord diameter (mm), and m is the number of the first circumferential cord layers 14, X is smaller than X of the first circumferential cord layer 14.
    Type: Application
    Filed: December 22, 2017
    Publication date: June 25, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Isao KUWAYAMA
  • Patent number: 10639936
    Abstract: A pneumatic tire comprises, in a tread surface: at least two circumferential main grooves continuously extending in a tire circumferential direction; and at least one rib-like land portion each defined by two adjacent circumferential main grooves from among the at least two circumferential main grooves. The rib-like land portion has: a circumferential sipe including a circumferential sipe portion extending in the tire circumferential direction; and a both-end closed sipe having both ends terminating within the rib-like land portion. When a land portion width of the rib-like land portion is evenly divided by three where a region at a center in a tire width direction is a center region and regions on both sides of the center region in the tire width direction are side regions, the circumferential sipe portion is located only in the center region, and the both-end closed sipe is located in any of the side regions.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: May 5, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shintaro Hatanaka, Isao Kuwayama
  • Patent number: 10556466
    Abstract: A tire comprising: a carcass; and inclined belt layers and a circumferential belt layer, wherein: the circumferential belt layer satisfies a correlation that X?750 when it is defined that X=Y×n×m, where Y is a Young's modulus in GPa of the cords forming the circumferential belt layer, n is a number of the cords implanted per 50 mm of width, and m is a number of layers of the circumferential belt layer; the inclined belt layers comprise at least two inclined belt layers having different tire widthwise widths; and a tire widthwise width W1 of an inclined belt layer having a widest width and a tire widthwise width W2 of an inclined belt layer having a narrowest width satisfy a correlation that W2?0.6W1.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: February 11, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Isao Kuwayama
  • Patent number: 10486473
    Abstract: When a tire is attached to a rim and set to an internal pressure of 250 kPa or more, a ratio SW/OD of the tire is 0.26 or less in the case where SW of the tire is less than 165 (mm), and SW and OD satisfy a relationship 2.135×SW+282.3?OD in the case where SW is 165 (mm) or more. The tread rubber has dynamic storage modulus E? of 6.0 MPa to 12.0 MPa, and loss tangent tan ? of 0.05 to 0.15. In at least one land portion, sipes are arranged with a predetermined pitch length L, and a land portion width W, a tire widthwise sipe component total length Ws of the sipes, the pitch length L, and a tire circumferential sipe component total length Ls of the sipes satisfy relationships 0.4W?Ws?1.2W and 0.6L?Ls?3L.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: November 26, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shintaro Hatanaka, Isao Kuwayama
  • Publication number: 20190337041
    Abstract: A sheet material machining system includes a sheet material machining machine which is configured to machine a workpiece to produce a machined workpiece that includes a plurality of products and a residual material. The machined workpiece is configured to be placed on a sorting table. The plurality of products are configured to be placed on a temporary placement table. At least one product among the plurality of products are configured to be placed on a discharge table. A carrier includes an attracting actuator and a mobile actuator. The order management processor is configured to control the carrier and includes a storage configured to memorize a layout of the plurality of products in the workpiece. The plurality of products are associated with an attracting order.
    Type: Application
    Filed: July 12, 2019
    Publication date: November 7, 2019
    Applicant: Yamazaki Mazak Corporation
    Inventors: Yukio MORITA, Isao KUWAYAMA, Tetsu HATTORI, Yoshihiko SAKAI, Yoshihiro NAKAMURA
  • Patent number: 10434823
    Abstract: A pneumatic radial tire for a passenger vehicle according to the present invention has an appropriate relationship between a tire cross-sectional width SW and a tire outer diameter OD. Also, a method of using the pneumatic radial tire for a passenger vehicle according to the present invention is to use the above radial tire with at least specified internal pressure.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: October 8, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Hiroyuki Matsumoto, Shintaro Hatanaka
  • Patent number: 10427459
    Abstract: To reduce noise while suppressing increase in rolling resistance, without affecting the formation of a carcass line, provided is a pneumatic tire 10 comprising an inner liner 17. The thickness of the inner liner 17 at least in part of a side portion 18 is 1.5 mm or more. When the tire 10 is mounted to a rim, and an internal pressure of 250 kPa or more is applied to the tire, in a case where a sectional width SW of the tire is less than 165 mm, a ratio of the sectional width SW to an outer diameter OD of the tire, SW/OD, is 0.26 or less; and in a case where the sectional width SW of the tire is 165 mm or more, the sectional width SW and the outer diameter OD of the tire satisfy a relation expression OD?2.135×SW+282.3.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: October 1, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Shintaro Hatanaka, Kentaro Kozuki
  • Patent number: 10427458
    Abstract: A pneumatic radial tire for a passenger vehicle according to the present invention has an appropriate relationship between a tire cross-sectional width SW and a tire outer diameter OD. Also, a method of using the pneumatic radial tire for a passenger vehicle according to the present invention is to use the above radial tire with at least specified internal pressure.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: October 1, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Hiroyuki Matsumoto, Shintaro Hatanaka
  • Patent number: 10226966
    Abstract: The present invention provides: a pneumatic radial tire for a passenger car, the tire having cross sectional width SW and outer diameter OD satisfying a predetermined relationship formula when the tire is assembled with a rim and inflated at internal pressure of at least 250 kPa; a tire-rim assembly formed by assembling bead portions of said tire with the rim; and a method for using a tire, including preparing a pneumatic radial tire for a passenger car in which cross sectional width SW and outer diameter OD of the tire satisfy a predetermined relationship formula, and using the tire at internal pressure of at least 250 kPa.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: March 12, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Shintaro Hatanaka, Hiroyuki Matsumoto
  • Patent number: 10214052
    Abstract: A run-flat tire of the present invention is a pneumatic radial tire for passenger vehicles which has a carcass composed of plies of radially arranged cords toroidally extending between a pair of bead portions, and the a W/L ratio of the section width W to the outer diameter L of the tire is 0.25 or less.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: February 26, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Isao Kuwayama
  • Patent number: 10207541
    Abstract: A pneumatic radial tire for a passenger vehicle according to the present invention has an appropriate relationship between a tire cross-sectional width SW and a tire outer diameter OD. Also, a method of using the pneumatic radial tire for a passenger vehicle according to the present invention is to use the above radial tire with at least specified internal pressure.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: February 19, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Hiroyuki Matsumoto, Shintaro Hatanaka
  • Patent number: 10207542
    Abstract: An object of the present invention is to adequately control relationship between a cross sectional width SW and an outer diameter OD of a pneumatic radial tire for a passenger vehicle. The tire is further characterized in that, provided that each half portion in the tire width direction of a ground contact surface of the tire is divided in the tire width direction into three equal portions including a tire-width-direction center portion, a tire-width-direction intermediate portion and a tire-width-direction outer portion from the tire-width-direction center side, rigidity in the tire circumferential direction of the belt reinforcing layer in a region in the tire width direction thereof corresponding to the tire-width-direction outer side portion is lower than rigidity in the tire circumferential direction of the belt reinforcing layer in a region in the tire width direction thereof corresponding to the tire-width-direction center portion.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: February 19, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Hiroyuki Matsumoto, Shintaro Hatanaka
  • Patent number: 10195899
    Abstract: Provided is a pneumatic radial tire for a passenger vehicle, having a carcass constituted of plies as radially-disposed cords and toroidally provided across a pair of bead portions, and including: a belt constituted of one or more belt layers; and a tread, which are disposed in this order on the outside in the radial direction of the carcass, in which: a section width SW and an outer diameter OD of the tire have a ratio of SW/OD?0.26 when SW<165 (mm), and SW and OD satisfy a relationship formula OD?2.035×SW+282.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: February 5, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shintaro Hatanaka, Hiroyuki Matsumoto, Isao Kuwayama, Jun Watanabe, Shingo Hiura
  • Patent number: 10189312
    Abstract: A pneumatic tire that makes steering stability, rolling resistance performance, and noise performance compatible includes a carcass toroidally extending between two bead portions; an inclined belt, with inclined belt layer(s) including cords that extend at an inclination relative to a tire circumferential direction, and a circumferential belt, with circumferential belt layer(s) including cords that extend along the tire circumferential direction, radially at an outer side of a crown portion of the carcass; and a tread at an outer side of the circumferential belt in the tire radial direction. An inclination angle of the cords in the inclined belt layers is 35° to 90°, the circumferential belt has a higher tire circumferential direction rigidity per unit width in a central region including a tire equator than in other regions, and in a surface region including the tire equator, the tread includes a land portion continuous in the tire circumferential direction.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: January 29, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Shintaro Hatanaka
  • Patent number: 10179481
    Abstract: A pneumatic tire includes a tread portion, carcass, inclined belt, and circumferential belt. The inclined belt is formed by inclined belt layer(s) including cords inclined relative to the tire circumferential direction. A circumferential main groove is provided in the tread portion. The inclined belt includes a high-angle inclined belt layer in which the cords are at an inclination angle of 35° to 90° relative to the tire circumferential direction. In at least one tread half portion, an edge of the high-angle inclined belt layer in the tire width direction is positioned further outward in the tire width direction than the circumferential main groove disposed furthest outward in the tire width direction. The interval in the tire width direction from the edge to the center of the circumferential main groove is 0.2W1 to 0.35W1, where W1 is the width of the high-angle inclined belt layer in the tire width direction.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: January 15, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shintaro Hatanaka, Isao Kuwayama
  • Patent number: 10166817
    Abstract: To reduce noise while suppressing increase in rolling resistance, without affecting the formation of a carcass line, provided is a pneumatic tire (10) including: a carcass (13); an inclined belt (14), and an inner liner (17). The inclined belt (14) is disposed on the tire radial outer side of the crown portion of the carcass (13). The inclined belt (14) includes at least one inclined belt layer (16). The inclined belt layer (16) has cords extending as being inclined at 35° or more with respect to the tire circumferential direction. The inner liner (17) has a thickness of 1.5 mm or more at least in part of a side portion (19).
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: January 1, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Isao Kuwayama, Shintaro Hatanaka, Kentaro Kozuki
  • Publication number: 20180272800
    Abstract: A pneumatic tire having sufficiently improved wet performance is provided. A pneumatic tire comprises a tread rubber that includes: a tread surface rubber layer located at an outermost surface of a tread; and a tread inside rubber layer located on a tire radial inner side of the tread surface rubber layer. A 100% modulus of the tread surface rubber layer is higher than a 100% modulus of the tread inside rubber layer, and the tread surface rubber layer is made of a rubber composition including: a rubber component (A) containing 50 mass % or more of diene-based rubber; and, with respect to 100 parts by mass of the rubber component (A), 5 to 50 parts by mass of at least one additive component (B) selected from: thermoplastic resin; oil; and an aromatic vinyl compound-conjugated diene compound copolymer whose polystyrene-equivalent weight-average molecular weight measured by gel permeation chromatography is 5,000 to 200,000.
    Type: Application
    Filed: July 28, 2016
    Publication date: September 27, 2018
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Isao KUWAYAMA, Hideyuki SAKURAI