Patents by Inventor Hiroshi Hirakawa
Hiroshi Hirakawa 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).
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Publication number: 20240073505Abstract: An illumination system includes: an irradiation device that irradiates light to a subject located in front of a displayer that displays a background image; an information acquisition device that acquires subject information for identifying the subject; a storage that stores background image information on the background image displayed on the displayer; and a controller that controls irradiation by the irradiation device. The controller generates shape information of the subject on basis of a difference between the subject information acquired by the information acquisition device and the background image information stored in the storage, and sets an irradiation range where light is irradiated by the irradiation device on basis of the shape information.Type: ApplicationFiled: August 11, 2023Publication date: February 29, 2024Inventors: Hidemasa KUBOTA, Kinya NOBORI, HIROSHI KAWAMURA, CHIKA HIRAKAWA
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Patent number: 5405690Abstract: A rubber-rubber bonded composite structure is made up of one unvulcanized preform formed from a rubber comprising hydrogenated acrylonitrile-butadiene rubber, either a combination of methacrylic acid and zinc oxide or zinc methacrylate, and an organic peroxide and another unvulcanized preform formed from a rubber composition containing a rubber in common use, both preforms having been laminated together into an integrally bonded structure by vulcanization. The resulting structure exhibits good rubber-to-rubber adhesion.Type: GrantFiled: May 27, 1994Date of Patent: April 11, 1995Assignee: The Yokohama Rubber Co., Ltd.Inventor: Hiroshi Hirakawa
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Patent number: 5370915Abstract: A rubber-rubber bonded composite structure is made up of one unvulcanized preform formed from a rubber comprising hydrogenated acrylonitrile-butadiene rubber, either a combination of methacrylic acid and zinc oxide or zinc methacrylate, and an organic peroxide and another unvulcanized preform formed from a rubber composition containing a rubber in common use both preforms having been laminated together into an integrally bonded structure by vulcanization. The resulting structure exhibits good rubber-to-rubber adhesion.Type: GrantFiled: January 7, 1993Date of Patent: December 6, 1994Assignee: The Yokohama Rubber Co., Ltd.Inventor: Hiroshi Hirakawa
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Patent number: 5264259Abstract: The energy absorbing structure of the present invention comprises a cylindrical hollow body of a fiber reinforced thermoplastic resin wherein both the ends are open, the cylindrical hollow body being attached to the outer wall of a moving body or the outer wall of a stationary body with which the moving body comes in contact in such a manner that the opening of the hollow body faces the outer wall.Type: GrantFiled: January 15, 1992Date of Patent: November 23, 1993Assignee: The Yokohama Rubber Co., Ltd.Inventors: Hajime Satoh, Hiroshi Hirakawa, Hiroyuki Hamada
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Patent number: 5236030Abstract: A pneumatic tire for automobile having an inner liner of a thin film of ultra high molecular weight polyethylene, which film is laminated directly over an inner wall of green tire and firmly bonded thereto when the tire is vulcanized.Type: GrantFiled: April 16, 1991Date of Patent: August 17, 1993Assignee: The Yokohama Rubber Co., Ltd.Inventors: Makoto Misawa, Hiroshi Hirakawa, Masao Inoue
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Patent number: 4748168Abstract: Rubber compositions suitable for tire treads are disclosed. Starting rubbers made up of at least one SBR of -20.degree. C. to -40.degree. C. in Tg and at least one SBR of lower than -45.degree. C. in Tg are blended with specified amounts of carbon blacks having a N.sub.2 SA of more than 120 m.sup.2 /g and of softeners having a VGC of 0.90 to 0.98, whereby the compositions are provided with a storage shear modulus of less than 500 MPa at -30.degree. C. The compositions are excellent in friction performance, abrasion resistance and low-temperature resistance.Type: GrantFiled: April 30, 1987Date of Patent: May 31, 1988Assignee: The Yokohama Rubber Co., Ltd.Inventors: Shinji Kawakami, Makoto Misawa, Takekazu Inoue, Yasuhiro Ishikawa, Hiroshi Hirakawa
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Patent number: 4396052Abstract: A radial tire having an under-tread layer between a cap tread and a breaker layer is disclosed. As the material for the cap tread, a rubber composition is employed which contains 0.5 to 1.6 parts by weight of sulfur per 100 parts by weight of starting rubber components consisting of 25 to 75 parts by weight of polybutadidne rubber having 65 to 90 mol % of 1,2-bonding units and 75 to 25 parts by weight of natural rubber and/or polyisoprene rubber, and which has elongation at break of at least 330% at 100.degree. C. A rubber composition containing 1.6 to 10 parts by weight of sulfur per 100 parts by weight of rubber components is used for the under-tread layer.Type: GrantFiled: April 22, 1981Date of Patent: August 2, 1983Assignee: The Yokohama Rubber Co., Ltd.Inventors: Asahiro Ahagon, Norimichi Takanashi, Hiroshi Hirakawa
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Patent number: 4373566Abstract: A pneumatic radial tire having a reduced rolling resistance and particularly suitable for a passenger car, comprising a toroidal carcass, a belt layer, a bead core, a side rubber, a tread rubber, a relatively thin base rubber, and a rubber filler, wherein provision is made of a stress relieving groove composed of a depression facing toward the bead rubber at a position near the joint portion between the side rubber and the tread rubber, the base rubber having a resilience which is higher than those of the tread rubber and the bead rubber.Type: GrantFiled: June 3, 1981Date of Patent: February 15, 1983Assignee: Bridgestone Tire Co., Ltd.Inventors: Hiroshi Hirakawa, Akio Sato, Takashi Takusagawa, Nobumasa Ikeda
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Patent number: 4349061Abstract: A pneumatic radial tire for passenger cars having a low rolling resistance is disclosed. The radial tire comprises a body reinforcement including a toroidal carcass composed of radially arranged cords and a belt superimposed about the carcass and consisting of plural rubberized plies each containing cords arranged at 60.degree.-80.degree. with respect to the radial plane of the tire, which cords of said plies being crossed with each other, and a bead reinforcement wherein the carcass is wound around a bead core to form a turnup portion, thread and sidewall rubbers covering these reinforcements. In the radial tire, a super-hard bead filler rubber is arranged at a region extending from the bead core to the middle part of the side portion, and a base rubber having a low loss modulus and a high resilience is arranged on at least both side edge parts of the belt at a volume ratio in the coating rubber for tread portion of 0.1-0.5.Type: GrantFiled: August 18, 1980Date of Patent: September 14, 1982Assignee: Bridgestone Tire Company LimitedInventors: Hiroshi Hirakawa, Akio Sato, Takashi Takusagawa, Nobumasa Ikeda
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Patent number: 4342670Abstract: A process for preparing a rubber composition for tire treads having resilience, wet skid resistance and wear resistance well balanced with each other, by mechanically mixing a specific amount in total of a halogenated butyl rubber, natural rubber or a polyisoprene rubber and a polybutadiene rubber with a specific amount of carbon black and with other additives in the first mixing step and then mechanically mixing the resulting mixture with the remainder of the rubber ingredients and carbon black in the second mixing step thereby to obtain the rubber composition.Type: GrantFiled: August 13, 1980Date of Patent: August 3, 1982Assignee: The Yokohama Rubber Co., Ltd.Inventors: Asahiro Ahagon, Makoto Misawa, Hiroshi Hirakawa
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Patent number: 4323485Abstract: A rubber composition for tire treads having improved rolling resistance and wet road braking performance, comprising (I) a chlorinated butyl rubber and/or a brominated butyl rubber, (II) natural rubber and/or a polyisoprene rubber and, if desired, (III) a polybutadiene rubber in specific blending ratios.Type: GrantFiled: March 26, 1980Date of Patent: April 6, 1982Assignee: The Yokohama Rubber Co., Ltd.Inventors: Asahiro Ahagon, Makoto Misawa, Kazuo Miyasaka, Hiroshi Hirakawa
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Patent number: 4321168Abstract: A process for preparing a tire tread rubber composition having improved rolling resistance and wet skid resistance comprising [I] 100 parts by weight of a rubber material composed of 25 to 75% by weight of substantially amorphous polybutadiene having a 1,2-bond unit content of 65 to 90 mole % and a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 20 to 100 and 75 to 25% by weight of natural rubber and/or cis-1,4-polyisoprene, and [II] 40 to 70 parts by weight of carbon black, said process comprising (1) mechanically compounding 40 to 60 parts by weight of the rubber material [I] with 40 to 70 parts by weight of carbon black [II], and then (2) adding to the resulting mixture the rubber material [I] in an amount sufficient to adjust the amount of the carbon black [II] to 40 to 70 parts by weight per 100 parts by weight of the rubber material [I] and mechanically compounding them.Type: GrantFiled: January 30, 1980Date of Patent: March 23, 1982Assignees: Nippon Zeon Co., Ltd., The Yokohama Rubber Co., Ltd.Inventors: Akio Ueda, Shuichi Akita, Hiroshi Hirakawa, Asahiro Ahagon
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Patent number: 4309318Abstract: A tread composition for low rolling resistance tires, comprising 100 parts by weight of styrene-butadiene rubber or a styrene-butadiene rubber-based rubber blend and 3.2-5.0 parts by weight of sulphur.Type: GrantFiled: November 16, 1979Date of Patent: January 5, 1982Assignee: Yokohama Rubber Co., Ltd.Inventors: Asahiro Ahagon, Makoto Misawa, Hiroshi Hirakawa, Kazuo Miyasaka
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Patent number: 4026878Abstract: Rubber compositions containing therein as a source of carbon disulfide a compound selected from the group consisting of cyclic bis (dithiocarbamic acid) metal salts and cyclic or non-cyclic dithiocarbamic-xanthogenic acid metal salts and an amine-isocyanate addition compound as a vulcanization accelerator system having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.Type: GrantFiled: October 24, 1975Date of Patent: May 31, 1977Assignee: The Yokohama Rubber Co. Ltd.Inventors: Kunio Kageyama, Hiroshi Hirakawa, Masatake Ozaki, Iwao Sugiyama, Mitsuharu Iwakura, Yoshiaki Someya
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Patent number: 4026877Abstract: Rubber compositions containing therein as a source of carbon disulfide at least one compound selected from the group consisting of cyclic bis (thiocarbamoyl) mono- or di-sulfides, cyclic bis (thioxanthogenyl) mono- or di-sulfides, and cyclic (thiocarbamoyl-thioxanthogenyl) mono- or di-sulfides and an amine-isocyanate addition compound as a vulcanization accelerator system having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.Type: GrantFiled: October 24, 1975Date of Patent: May 31, 1977Assignee: The Yokohama Rubber Co. Ltd.Inventors: Kunio Kageyama, Hiroshi Hirakawa, Masatake Ozaki, Iwao Sugiyama, Mitsuharu Iwakura, Yoshiaki Someya
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Patent number: 4020252Abstract: Rubber compositions containing an alkylene-bisdithiocarbamate and an amine-isocyanate addition compound as a vulcanization accelerator having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.Type: GrantFiled: July 1, 1975Date of Patent: April 26, 1977Assignee: The Yokohama Rubber Co., Ltd.Inventors: Iwao Sugiyama, Teruhide Furuhama, Fumiaki Nagano, Hiroshi Hirakawa