Patents Assigned to Bridgestone Corporation
  • Publication number: 20250145897
    Abstract: Provided is a method for producing chemical products, including: a pyrolysis step of obtaining a first gas fraction, a pyrolysis oil, and a residual fraction by pyrolysis of a crushed material of a waste material including waste tires; a hydrogenolysis step of obtaining a second gas fraction, a light fraction with a boiling point of 350° C. or lower, and a heavy fraction with a boiling point higher than 350° C. by hydrogenolysis of a raw material oil containing at least a part of the pyrolysis oil; and a steam-cracking step of obtaining a chemical product by steam cracking of a steam-cracking raw material oil containing at least a part of the light fraction.
    Type: Application
    Filed: January 17, 2023
    Publication date: May 8, 2025
    Applicants: ENEOS Corporation, Bridgestone Corporation
    Inventors: Masahide KOBAYASHI, Naoko URUSHIZAKO, Rina IWAMOTO, Ryoji IDA, Masahiro HOJO, Seiichi TAHARA, Akira OKUNO, Marino KUNO ITODA
  • Publication number: 20250145798
    Abstract: The problem to be solved by the present disclosure is to provide a rubber composition that achieves both low fuel consumption performance and durability. The solution is a rubber composition including a diene-based rubber (A), a heterocyclic compound (B) having at least one heterocyclic ring selected from the group consisting of pyrimidine, pyridazine, pyrazine, triazine, and tetrazine rings, and a metal salt (C), wherein the bond dissociation energy between the metal salt (C) and the heterocyclic compound (B) is 200 kJ/mol or more.
    Type: Application
    Filed: February 28, 2023
    Publication date: May 8, 2025
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Kyohei KOTANI, Takatsugu TANAKA, Tomoyuki KOSAI
  • Publication number: 20250145739
    Abstract: Provided is a method of decomposing a crosslinked rubber that includes: a first decomposition step of decomposing a crosslinked rubber containing a diene rubber, using a catalyst represented by the following general formula (1), (2), or (3), where M is ruthenium, molybdenum, or the like, X1, X2, L1, L2, and L3 each independently represent a ligand, R1, R2, and R3 each independently represent hydrogen, an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, or the like (these groups may be substituted by one or more alkyl groups, halogens, alkoxy groups, or the like), L1 and L2, R1 and R2, and L1 and R1 may respectively bond with each other to form rings; and a second decomposition step of pyrolyzing a decomposition product obtained by the first decomposition step at a temperature of 300° C. to 950° C. in the presence of a catalyst.
    Type: Application
    Filed: February 6, 2023
    Publication date: May 8, 2025
    Applicants: BRIDGESTONE CORPORATION, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Masahiro HOJO, Akira OKUNO, Marino KUNO, Norihisa FUKAYA, Satpriyo Putro WAHYU, Jun-Chul CHOI, Faried MIFTAH, Hiroshi YAMASHITA, Tadahiro FUJITANI, Makiko HATORI, Makoto SUGIKI
  • Publication number: 20250136853
    Abstract: Provided are an adhesive composition that can ensure desired adhesiveness without using resorcin and does not impair workability in use, as well as an organic fiber material, a rubber article, an organic fiber-rubber composite and a tire using the adhesive composition. The adhesive composition of the present disclosure contains (A) rubber latex having unsaturated diene, and (B) a compound containing an acrylamide structure having a cationic group and/or a carboxyl group.
    Type: Application
    Filed: October 18, 2022
    Publication date: May 1, 2025
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Masaaki NAKAMURA
  • Publication number: 20250136780
    Abstract: Provided is a method of decomposing a crosslinked rubber that can improve monomer yield. The method of decomposing a crosslinked rubber includes: a first decomposition step of pyrolyzing a crosslinked rubber containing a rubber component that includes a diene-based rubber at not lower than 150° C. and not higher than 400° C.; and a second decomposition step of further pyrolyzing a decomposition product obtained through the first decomposition step at not lower than 600° C. and not higher than 950° C. in an inert gas atmosphere and in the absence of a catalyst. The first decomposition step is preferably performed in an inert gas atmosphere.
    Type: Application
    Filed: February 6, 2023
    Publication date: May 1, 2025
    Applicants: BRIDGESTONE CORPORATION, TOHOKU UNIVERSITY
    Inventors: Masahiro HOJO, Akira OKUNO, Marino KUNO, Hironori MORISHITA, Masahiro HOMMA, Toshiaki YOSHIOKA, Shogo KUMAGAI
  • Publication number: 20250136530
    Abstract: Provided is a method of decomposing a crosslinked rubber that includes: a first decomposition step of decomposing a crosslinked rubber containing a diene rubber, using a catalyst represented by the following general formula (1), (2), or (3), where M is ruthenium, molybdenum, etc., X1, X2, L1, L2, and L3 each independently represent a ligand, R1, R2, and R3 each independently represent hydrogen, an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, etc. (these groups may be substituted by one or more alkyl groups, halogens, alkoxy groups, etc.), L1 and L2, R1 and R2, and L1 and R1 may respectively bond with each other to form rings; and a second decomposition step of pyrolyzing a decomposition product obtained by the first decomposition step under an inert gas atmosphere and in the absence of a catalyst at a temperature of 600° C. to 950° C.
    Type: Application
    Filed: February 6, 2023
    Publication date: May 1, 2025
    Applicants: BRIDGESTONE CORPORATION, TOHOKU UNIVERSITY, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Masahiro HOJO, Akira OKUNO, Marino KUNO, Toshiaki YOSHIOKA, Shogo KUMAGAI, Norihisa FUKAYA, Satpriyo Putro WAHYU, Jun-Chul CHOI, Faried MIFTAH, Hiroshi YAMASHITA, Tadahiro FUJITANI, Makiko HATORI, Makoto SUGIKI
  • Publication number: 20250136529
    Abstract: Provided is a method of decomposing a crosslinked rubber that includes: a first decomposition step of decomposing a crosslinked rubber containing a diene rubber, using a catalyst represented by the following general formula (1), (2), or (3), where Mis ruthenium, molybdenum, etc., X1, X2, L1, L2, and L3 each independently represent a ligand, R1, R2, and R3 each independently represent hydrogen, an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, etc. (these groups may be substituted by one or more alkyl groups, halogens, alkoxy groups, etc.), L1 and L2, R1 and R2, and L1 and R1 may respectively bond with each other to form rings; and a second decomposition step of pyrolyzing a decomposition product obtained by the first decomposition step under an inert gas atmosphere and in the absence of a catalyst at a temperature of 300° C. to 450° C.
    Type: Application
    Filed: February 6, 2023
    Publication date: May 1, 2025
    Applicants: BRIDGESTONE CORPORATION, TOHOKU UNIVERSITY, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Masahiro HOJO, Akira OKUNO, Marino KUNO, Toshiaki YOSHIOKA, Shogo KUMAGAI, Norihisa FUKAYA, Satpriyo Putro WAHYU, Jun-Chul CHOI, Faried MIFTAH, Hiroshi YAMASHITA, Tadahiro FUJITANI, Makiko HATORI, Makoto SUGIKI
  • Publication number: 20250128549
    Abstract: A tire management device (10) includes: an information acquisition section (131) that acquires mounted position information indicating a mounted position of a tire on a vehicle (20) and mounted tire information that is information on the state of the tire including internal pressure; a determination section (132) that determines an abnormal internal pressure of the tire based on the mounted tire information; and a notification section (133) that outputs the mounted position and an abnormal internal pressure determination result of the tire that has been determined to have an abnormal internal pressure to a notification destination.
    Type: Application
    Filed: June 1, 2022
    Publication date: April 24, 2025
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shuzo YANAGIDA, Daisuke SATO, Hiroki YASUDA, Takanori KARUBE, Shunsuke SENTOKU, Tomoaki MIYOSHI, Eri HARADA
  • Publication number: 20250129291
    Abstract: Provided is a method of decomposing a crosslinked rubber that can improve monomer yield. The method of decomposing a crosslinked rubber includes: a first decomposition step of pyrolyzing a crosslinked rubber containing a rubber component that includes a diene-based rubber at not lower than 150° C. and not higher than 400° C.; and a second decomposition step of further pyrolyzing a decomposition product obtained through the first decomposition step at not lower than 300° C. and not higher than 450° C. in an inert gas atmosphere and in the absence of a catalyst. The first decomposition step is preferably performed in an inert gas atmosphere.
    Type: Application
    Filed: February 6, 2023
    Publication date: April 24, 2025
    Applicants: BRIDGESTONE CORPORATION, TOHOKU UNIVERSITY
    Inventors: Masahiro HOJO, Akira OKUNO, Marino KUNO, Hironori MORISHITA, Masahiro HOMMA, Toshiaki YOSHIOKA, Shogo KUMAGAI
  • Publication number: 20250128548
    Abstract: A pneumatic tire of the present disclosure includes an endless belt with a rubber coated cord, formed by coating a belt cord with rubber, extending in a zigzag manner in the tire circumferential direction. In a developed view of the endless belt, an intersection formed by the belt cord intersecting at two bent portions, adjacent in the tire circumferential direction, of the rubber coated cord is designated as T, and a length L in the tire circumferential direction between two intersections T adjacent in the tire circumferential direction, a width W of the belt cord, and an inclination angle ?1 of the belt cord relative to the tire circumferential direction at inclined extending portions of the rubber coated cord satisfy the relationships 5°<?1?10°, and L<(3 W/tan(?1?2°)), or 10°<?1?45°, and L<(3 W/tan(?1?5°)).
    Type: Application
    Filed: June 17, 2022
    Publication date: April 24, 2025
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Saki SHIBATA
  • Patent number: 12280558
    Abstract: A vulcanization mold including blades having a distal end side and pullout is performed smoothly without causing any failure and a pneumatic tire. A vulcanization mold in which a blade has a proximal end, a blade distal end side expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the proximal end portion and the blade distal end side is a vulcanization mold in which a sweep area is the difference where a cross sectional area of the blade connection is subtracted from an area blade distal end side to a mold surface with a width equal to a maximum width of a thickness of the blade distal end side in a cross sectional shape perpendicular to a tire widthwise direction of the blade is smaller in circumferential end side regions than in a circumferential central side region of the sector mold.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: April 22, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Tatsuhiko Hatano, Yasuo Shibata, Tatsuya Nakai
  • Patent number: 12281662
    Abstract: A fluid pressure actuator according to this disclosure is a fluid pressure actuator that expands and contracts by fluid pressure, including an attachment attached to the distal end side, wherein the attachment is a spatular portion including a holding surface at one side in the thickness direction, and the spatular portion includes: a thin-walled portion at the distal end side; and a bump thick-walled portion that is located at the proximal end side of the thin-walled portion and is thicker than the thin-walled portion by a bump portion that protrudes or is able to protrude on the holding surface.
    Type: Grant
    Filed: September 28, 2022
    Date of Patent: April 22, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Hitoshi Yasui
  • Patent number: 12280616
    Abstract: A pneumatic tire that includes a tread surface 1 including: two or more main grooves 3; and a pair of middle block rows 22, wherein one or more first middle blocks in the plurality of middle blocks each have a middle block inclined side wall surface 223 that faces an outer main groove in the pair of outer main grooves and that gradually inclines inwards in a tire radial direction as the middle block inclined side wall surface extends outwards in the tire width direction, and the middle block inclined side wall surface forms an acute angle ?223 of 30° to 50° with respect to a normal of the tread surface at an inner end in the tire width direction of the middle block inclined side wall surface.
    Type: Grant
    Filed: November 5, 2021
    Date of Patent: April 22, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Mayuko Karasawa, Kai Yamada
  • Patent number: 12275208
    Abstract: A vulcanization mold in which a blade has a blade proximal end portion, a blade distal end side thick portion expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the portions to each other, is a vulcanization mold wherein a sweep area that is the difference where a cross sectional area of the blade connection portion is subtracted from an area from the blade distal end side thick portion to a mold surface with a width equal to a maximum width of a thickness of the blade distal end side thick portion in a cross sectional shape perpendicular to a tire widthwise direction of the blade is smaller at the blades in circumferential end portion side regions than at the blades in a circumferential central portion side region of the sector mold. Further, a pneumatic tire is manufactured using the vulcanization mold.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: April 15, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Tatsuhiko Hatano, Yasuo Shibata, Tatsuya Nakai
  • Patent number: D1070731
    Type: Grant
    Filed: October 4, 2023
    Date of Patent: April 15, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Kenta Imai, Shoichi Tanaka
  • Patent number: D1070888
    Type: Grant
    Filed: November 22, 2023
    Date of Patent: April 15, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Kodai Sato, Patrik Bednar, Karol Kastella
  • Patent number: D1070889
    Type: Grant
    Filed: November 22, 2023
    Date of Patent: April 15, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Kodai Sato, Patrik Bednar, Karol Kastella
  • Patent number: D1070890
    Type: Grant
    Filed: November 22, 2023
    Date of Patent: April 15, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Kodai Sato
  • Patent number: D1072718
    Type: Grant
    Filed: November 14, 2023
    Date of Patent: April 29, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Yoshiyuki Tanabe
  • Patent number: D1073709
    Type: Grant
    Filed: November 22, 2023
    Date of Patent: May 6, 2025
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Kodai Sato, Patrik Bednar, Karol Kastella