Patents by Inventor Hiroki Kawai

Hiroki Kawai 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: 20240051340
    Abstract: A pneumatic tire having a tread section and a belt layer, wherein monofilament cords are used as reinforcing cords in the belt layer, and an arranged number e of the monofilament cords per 5 cm in the tire-width direction (cords/5 cm) in a tire radial direction cross-section of the belt layer, and a tire cross-sectional width Wt (mm), incorporated in a standardized rim and with an internal pressure of 250 kPa, satisfies (formula 1) and (formula 2) below: e/(0.31Wt+14.35)>1??(formula 1); e/(0.31Wt+56.45)??(formula 2).
    Type: Application
    Filed: October 26, 2021
    Publication date: February 15, 2024
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Momoka MISAKI, Miao DONG, Hiroki KAWAI
  • Publication number: 20240051339
    Abstract: A pneumatic tire having a tread portion and a belt layer, wherein the reinforcing cords in the belt layer are composed of monofilament cords arranged in the tire width direction at least 50 cords/5 cm in the cross section of the belt layer in the tire radial direction. A pneumatic tire that is installed on a standardized rim and satisfies the following (formula 1), where Wt (mm) is the cross-sectional width of the tire and Dt (mm) is the outer diameter of the tire when the internal pressure is 250 kPa: 1500?(Dt2×?/4)/Wt??(formula 1).
    Type: Application
    Filed: October 26, 2021
    Publication date: February 15, 2024
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Momoka MISAKI, Miao DONG, Hiroki KAWAI
  • Publication number: 20230411530
    Abstract: According to one embodiment, a semiconductor device includes an oxide semiconductor layer, an oxide conductor layer disposed on the oxide semiconductor layer, a first oxide layer disposed on the oxide conductor layer and comprising vanadium oxide, and a metal wiring layer disposed on the first oxide layer.
    Type: Application
    Filed: March 2, 2023
    Publication date: December 21, 2023
    Inventor: Hiroki KAWAI
  • Publication number: 20230413529
    Abstract: According to one embodiment, a semiconductor device includes a first electrode, a second electrode, a metal oxide semiconductor contacting the first electrode and the second electrode, a gate electrode, and an insulating film disposed between the metal oxide semiconductor and the gate electrode. The metal oxide semiconductor comprises indium, zinc, and niobium.
    Type: Application
    Filed: March 1, 2023
    Publication date: December 21, 2023
    Inventors: Kasumi YASUDA, Hiroki KAWAI
  • Publication number: 20230393503
    Abstract: A fixing apparatus includes a heating rotary member and a pressing rotary member, which form a nip portion, at which a toner image is fixed to a recording material, a mixture job is a job with a mixture of recording materials including a recording material with a first grammage and a recording material with a second grammage greater than the first grammage, one of a plurality of modes is performable in the mixture job, in which a maximum value of an amount of toner on the recording material with the first grammage is greater than a maximum value of the amount of toner on the recording material with the second grammage in the first mode whereas the maximum value on the recording material with the first grammage is equal to the maximum value on the recording material with the second grammage in the second mode.
    Type: Application
    Filed: March 15, 2023
    Publication date: December 7, 2023
    Inventors: DAIGO MATSUURA, HIROKI KAWAI, AYANO OGATA, YASUHARU TORATANI, MISA KAWASHIMA
  • Publication number: 20230311586
    Abstract: A pneumatic tire having a side portion and a clinch portion, wherein: in a meridian cross section, the distance from a bead baseline to the outside portion in the width direction of the clinch portion is greater than the distance to the inside portion in the width direction; the E*S of the side portion, as measured at 70° C., a frequency of 10 Hz, an initial distortion of 5%, and a distortion rate of 1%, is less than the E*C of the clinch portion; and, formulas (1) and (2) are satisfied: 1600?(Dt2×?/4)/Wt?2827.4??(1) [(V+1.5×107)/Wt]?2.88×105??(2) where Wt is the cross-sectional width of the tire installed on a standardized rim and filled with air to an internal pressure of 250 kPa, Dt is the outer diameter, and V is the volume of the tire.
    Type: Application
    Filed: August 23, 2021
    Publication date: October 5, 2023
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Publication number: 20230294455
    Abstract: Provided is a pneumatic tire with which any change in steering stability between low-speed running and high-speed running is sufficiently minimized, and durability is also sufficiently improved. This pneumatic tire has a belt layer radially inward of the tread portion, wherein the ratio (tan ?/E*) of the loss tangent (tan ?) to the complex elastic modulus E*(MPa) of the rubber composition constituting the belt layer, as measured under the conditions of 70° C., frequency 10 Hz, initial distortion 5%, and dynamic distortion rate 1%, is 0.002 to 0.017 (inclusive), and the (formula 1) and (formula 2) are satisfied, where Wt (mm) is the cross-sectional width of the tire, Dt (mm) is the outside diameter, and the virtual volume V (mm3) is the volume of the space occupied by the tire, when the tire is installed on a standardized rim and the internal pressure is 250 kPa. 1700?(Dt2×?/4)/Wt?2827.4??(formula 1) [(V+1.5×107)/Wt]?2.
    Type: Application
    Filed: July 29, 2021
    Publication date: September 21, 2023
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Publication number: 20230294460
    Abstract: A pneumatic tire is provided which has sufficiently reduced rolling resistance during high-speed running and which has excellent durability. The pneumatic tire has a bead portion, carcass and tread, wherein: a bead-reinforcing layer that reinforces the bead portion from outside of the carcass is provided outside of the carcass in the tire axis direction; and the pneumatic tire satisfies (formula 1) and (formula 2) below, where Wt (mm) is the cross-sectional width of the tire when the tire installed on a standardized rim and the internal pressure is 250 kPa, Dt (mm) is the outer diameter, and the virtual volume V (mm3) is the volume of the space occupied by the tire. 1600?(Dt2×?/4)/Wt?2827.4??(formula 1) [(V+1.5×107)/Wt]?2.
    Type: Application
    Filed: July 20, 2021
    Publication date: September 21, 2023
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Patent number: 11764506
    Abstract: A connector pair includes a first connector, and a second connector electrically connected to the first connector. The first connector includes a first electrical contact part provided with a graphene film on a metal base material. The second connector includes a second electrical contact part electrically connected to the first connector via the graphene film. A contact area between the first electrical contact part and the second electrical contact part is smaller than an area of the graphene film coating the metal base material.
    Type: Grant
    Filed: January 26, 2021
    Date of Patent: September 19, 2023
    Assignee: YAZAKI CORPORATION
    Inventors: Toshitaka Kubo, Kazuhiko Seki, Mitsuhiro Okada, Kazuto Hatakeyama, Kenji Koga, Tetsuo Shimizu, Nan Ye, Hiroki Kawai
  • Publication number: 20230286329
    Abstract: Provided is a pneumatic tire for which rolling resistance at high speed running is sufficiently reduced and durability is sufficiently improved. The pneumatic tire has a side portion, a thickness S (mm) of a rubber layer radially outside a carcass on the side portion at the maximum tire width position is 3 mm or less, the loss tangent of the rubber layer measured under the conditions of 70° C., a frequency of 10 Hz, an initial distortion of 5%, and a dynamic distortion rate of 1% is 0.15 or less, and when the cross-sectional width of the tire is Wt (mm) and the outer diameter is Dt (mm) when installed on a regular rim and the internal pressure is 250 kPa, the volume of the space occupied by the tire is the virtual volume V (mm3), the following (formula 1) and (formula 2) are satisfied. 1700?(Dt2×?/4)/Wt?2827.4??(formula 1) [(V+1.5×107)/Wt]?2.
    Type: Application
    Filed: July 20, 2021
    Publication date: September 14, 2023
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Publication number: 20230286330
    Abstract: Provided is a pneumatic tire that has reduced rolling resistance during high-speed running as well as excellent durability performance. This pneumatic tire comprises a sidewall and a clinch section in each of a pair of side sections. When the loss tangent of the sidewall is tan ?sw and the loss tangent of the clinch section is tan ?c when measured under the conditions of 70° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, then (tan ?sw+tan ?c)?0.3 and |tan ?sw?tan ?c|?0.07. When the cross-sectional width of the tire is Wt (mm) and the external diameter is Dt (mm) when the pneumatic tire is installed on a standardized rim and internal pressure is set to 250 kPa, and if the volume of space occupied by the tire is a virtual volume V (mm3), then (formula 1) and (formula 2) are satisfied. 1700?(Dt2×?/4)/Wt?2827.4??(formula 1) [(V+1.5×107)/Wt]?2.88×105??(formula 2).
    Type: Application
    Filed: July 26, 2021
    Publication date: September 14, 2023
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Publication number: 20230286321
    Abstract: A pneumatic tire having a tread, wherein the ground contact surface of the tread is composed of at least two types of rubber compositions different in the thermal conductivity, and the following formulas (1) and (2) are satisfied: 1700?(Dt2×?/4)/Wt?2827.4??(1) [(V+1.5×107)/Wt]?2.88×105??(2) where Wt (mm) is the cross-sectional width and Dt (mm) is the outer diameter of the tire when installed on a standardized rim and inflated to an internal pressure of 250 kPa, and V (mm3) is the virtual volume of the space occupied by the tire.
    Type: Application
    Filed: July 21, 2021
    Publication date: September 14, 2023
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Publication number: 20230278372
    Abstract: Provided is a pneumatic tire having a sufficiently suppressed change in handling property and sufficiently improved durability. This pneumatic tire comprises a tread portion including a rubber layer, the rubber layer is formed of a rubber composition having 0.25 or less of a loss tangent (15° C. tan?) measured under such conditions as 15° C.
    Type: Application
    Filed: October 8, 2020
    Publication date: September 7, 2023
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Publication number: 20230273550
    Abstract: A fixing device includes an endless belt, a rotatable pressing member, a pad member inside of the belt, and a sliding member held by the pad member and sliding on an inner circumferential surface of the belt in a nip. The rotatable pressing member nips and feeds a recording material in the nip in cooperation with the belt and fixes a toner image on the recording material by applying heat and pressure. The sliding member includes a base material layer on which a plurality of projections projecting toward the rotatable pressing member are formed on a side sliding with the belt and a sliding layer provided on an outer surface of the plurality of projections. A leading end of the plurality of projections is a plane and an average roughness (Ra) of the plane satisfies 0.13 ?m?Ra?1.67 ?m.
    Type: Application
    Filed: February 16, 2023
    Publication date: August 31, 2023
    Inventors: AKIYOSHI SHINAGAWA, YASUHARU TORATANI, HIROSHI MIYAMOTO, DAIGO MATSUURA, HIROKI KAWAI, AYANO OGATA, MASANOBU TANAKA, ASUNA FUKAMACHI, MISA KAWASHIMA
  • Publication number: 20230273555
    Abstract: A fixing device includes an endless belt, a rotatable pressing member, a pad member inside of the belt, and a sliding member held by the pad member and sliding on an inner circumferential surface of the belt in a nip. The rotatable pressing member nips and feeds a recording material in the nip in cooperation with the belt and fixes a toner image on the recording material by applying heat and pressure. The sliding member includes a base material layer on which a plurality of projections projecting toward the rotatable pressing member are formed on a side sliding with the belt and a sliding layer provided on an outer surface of the plurality of projections. A shape of a surface of the sliding layer is a curved surface and a radius of curvature R of the curved surface satisfies 300 µm ? R ? 850 µm.
    Type: Application
    Filed: February 9, 2023
    Publication date: August 31, 2023
    Inventors: HIROKI KAWAI, YASUHARU TORATANI, HIROSHI MIYAMOTO, AKIYOSHI SHINAGAWA, AYANO OGATA, DAIGO MATSUURA, MISA KAWASHIMA, MASANOBU TANAKA, ASUNA FUKAMACHI
  • Publication number: 20230273556
    Abstract: A fixing device includes a fixing belt configured to heat a recording material, a pressure member configured to press the fixing belt, and a sliding member configured to be in sliding contact with an inner peripheral surface of the fixing belt and being opposed to the pressure member. The pressure member and the fixing belt form a fixing nip portion, and heat and pressure are applied to the recording material at the fixing nip portion to fix a toner image onto the recording material. The sliding member includes a plurality of protrusions on a surface of the sliding member that is in sliding contact with the inner peripheral surface of the fixing belt. The following expressions are satisfied: The fixing belt satisfies the prescribed formula.
    Type: Application
    Filed: February 13, 2023
    Publication date: August 31, 2023
    Inventors: YASUHARU TORATANI, AKIYOSHI SHINAGAWA, HIROSHI MIYAMOTO, DAIGO MATSUURA, HIROKI KAWAI, AYANO OGATA, ASUNA FUKAMACHI, MASANOBU TANAKA, MISA KAWASHIMA
  • Publication number: 20230273554
    Abstract: A fixing device includes an endless belt, a rotatable pressing member contacting an outer circumferential surface of the belt, and a sliding member inside of the belt. The sliding member forms a nip portion by nipping and feeding the belt between itself and the rotatable pressing member and slides on an inner circumferential surface of the belt. The rotatable pressing member nips and feeds the recording material in the nip portion in cooperation with the belt and fixes a toner image on the recording material by applying heat and pressure. The sliding member includes a substrate extending in a widthwise direction of the belt, and the substrate is made of metal and includes a plurality of projections projecting toward the rotatable pressing member.
    Type: Application
    Filed: January 30, 2023
    Publication date: August 31, 2023
    Inventors: DAIGO MATSUURA, YASUHARU TORATANI, AKIYOSHI SHINAGAWA, HIROSHI MIYAMOTO, AYANO OGATA, HIROKI KAWAI, MASANOBU TANAKA, ASUNA FUKAMACHI, MISA KAWASHIMA
  • Publication number: 20230264518
    Abstract: The present invention provides a pneumatic tire which is sufficiently reduced in the rolling resistance during high-speed travel, while having sufficiently improved chipping resistance. A pneumatic tire which has a tread part, wherein: at least one rubber layer that forms the tread part contains a rubber component that contains an isoprene rubber, a styrene butadiene rubber and a butadiene rubber, while containing more than 5 parts by mass but 25 parts by mass or less of carbon black relative to 100 parts by mass of the rubber component; and if Wt (mm) is the cross-sectional width of the tire, Dt (mm) is the outer diameter of the tire, and V (mm3) is the virtual volume that is the volume of the space occupied by the tire when this pneumatic tire is installed on a standardized rim and the internal pressure is 250 kPa, (formula 1) and (formula 2) are satisfied. 1700?(Dt2×?/4)/Wt?2827.4??(formula 1) [(V+1.5×107)/Wt]?2.
    Type: Application
    Filed: July 26, 2021
    Publication date: August 24, 2023
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Publication number: 20230264519
    Abstract: A pneumatic tire is provided which has sufficiently reduced rolling resistance during high-speed running and which has sufficiently improved durability. In this pneumatic tire, which has a tread, at least one rubber layer forming the tread includes a rubber component containing styrene butadiene rubber and isoprene rubber, and is formed from a rubber composition with a loss tangent (30° C. tan ?) less than or equal to 0.14, measured under the conditions of 30° C., frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%; defining Wt (mm) as the cross-section width, Dt (mm) as the outer diameter and virtual volume V (mm3) as the volume of the space occupied by the tire when said tire is installed on the standardized rim and has an internal pressure of 250 kPa, the pneumatic tire satisfies (Formula 1) and (Formula 2). 1600?(Dt2×?/4)/Wt?2827.4??(Formula 1) [(V+1.5×107)/Wt]?2.
    Type: Application
    Filed: July 26, 2021
    Publication date: August 24, 2023
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Kenji HAMAMURA, Hiroki KAWAI, Subaru TOYA
  • Patent number: 11724544
    Abstract: To provide a pneumatic tire excellent in steering stability and durability at high-speed driving, it is provided a pneumatic tire having a tread portion and a belt layer, wherein the tread portion is arranged on the outer side of the belt layer in the tire radial direction, the reinforcing cord in the belt layer is composed of cords made of monofilaments in which 50/5 cm or more of the monofilaments are arranged in the tire width direction in the tire radial cross section of the belt layer, and the maximum load capacity of the tire WL (kg) and the weight of the tire WT (kg) satisfy (WT/WL)?0.0140.
    Type: Grant
    Filed: December 28, 2021
    Date of Patent: August 15, 2023
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Momoka Misaki, Dong Miao, Hiroki Kawai