Patents by Inventor Kazuto Yamakawa

Kazuto Yamakawa 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: 20220355643
    Abstract: Provided is a piping system for an air conditioner installed in a vehicle that can achieve appropriate weight reduction while ensuring appropriate pressure resistance as the piping system as a whole. A circulation path that connects component devices of an air conditioner (8) in an annular shape to circulate a refrigerant (C) is formed by each pipe body extending between the component devices. At least one of the pipe bodies includes: a resin hose (2) embedded with a non-metal reinforcing material (3f) or a resin pipe (5) embedded with a non-metal reinforcing material (6f), and the resin pipe bodies (2), (5) are employed in 50% or more of a total length of each of the pipe bodies constituting the circulation path.
    Type: Application
    Filed: March 24, 2020
    Publication date: November 10, 2022
    Inventors: Gang HOU, Hiroaki SHIBANO, Jiro WATANABE, Susumu HATANAKA, Naoshi YAMAGUCHI, Mie OKURA, Ikuma YUSA, Shusaku TOMOI, Tomohide SAITA, Hiroyuki WAKAMATSU, Ryuhei SUZUKI, Yuki MIZUTANI, Nobuaki KURIBAYASHI, Hiroshi SHINTANI, Kazuto YAMAKAWA
  • Patent number: 10273352
    Abstract: A pneumatic tire using as a tread part, a rubber composition containing a high silica-content rubber composition having a difference F-S between an amount of filler F and an amount of a softening agent S of 60 to 90 parts by weight and having a durometer hardness measured at 20° C. of 65 to 76.
    Type: Grant
    Filed: August 2, 2007
    Date of Patent: April 30, 2019
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Naoya Amino, Yoshihiro Kameda, Kazuto Yamakawa, Akitomo Sato
  • Patent number: 8865316
    Abstract: A rubber laminate comprises a reinforcing layer and a second rubber layer laminated sequentially on a first rubber layer, at least one outer surface of the first rubber layer and the second rubber layer being covered with an ultra high molecular weight polyethylene layer, wherein the rubber layers covered with the ultra high molecular weight polyethylene layer are formed from a rubber composition comprising from 20 to 40 parts by mass of a softener per 100 parts by mass of a mixed rubber consisting of from 60 to 80% by mass ratio of a diene rubber and 20 to 40% by mass ratio of a ethylene-propylene-diene rubber and/or a butyl rubber.
    Type: Grant
    Filed: December 28, 2009
    Date of Patent: October 21, 2014
    Assignee: The Yokohama Rubber Co., Ltd
    Inventors: Peng Gong, Kazuto Yamakawa, Naoto Torii, Akira Sato
  • Patent number: 8715801
    Abstract: A hose for transporting refrigerant includes an inner tube layer having a gas barrier layer and a rubber layer adjacent to the outer surface of the gas barrier layer. The gas barrier layer is formed using a thermoplastic resin composition comprising a polyamide resin and a modified rubber having an acid anhydride group or an epoxy group, the modified rubber being obtained by modifying a modified raw rubber having an acid anhydride group or an epoxy group with a hydrogen bond-forming compound having a functional group which reacts with the acid anhydride group or the epoxy group and a functional group which is able to form a hydrogen bond with an amide bond or a hydroxyl group. The rubber layer is formed using a rubber composition comprising from 1 to 15 parts by mass of an alkylphenol-formaldehyde resin per 100 parts by mass of a raw rubber.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: May 6, 2014
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuto Yamakawa, Yasuaki Shinoda
  • Patent number: 8691386
    Abstract: A bonded body 10 of a carbon film covered article and a rubber is formed by bonding a carbon film covered article 13 having a carbon film 12 formed on a surface of an article 11 to an unvulcanized rubber 14 by affixing and vulcanizing. Thereby, a bonded body of rubber and, for example, metal can be provided without the need for an adhesive.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: April 8, 2014
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuto Yamakawa, Yuusuke Matsuya
  • Patent number: 8642149
    Abstract: A hose for transporting refrigerant of the present technology includes an inner tube layer having a gas barrier layer and a rubber layer adjacent to an outer surface of the gas barrier layer. The gas barrier layer includes a polyamide resin composition obtained by blending from 0.5 to 20 parts by mass of a hydrotalcite per 100 parts by mass of a modified polyamide obtained by blending a polyamide and a carboxyl group-containing modified polyolefin. The rubber layer includes a rubber composition obtained by compounding from 1 to 15 parts by mass of an alkylphenol-formaldehyde resin per 100 parts by mass of a raw rubber. The raw rubber is at least one selected from the group consisting of a BIMS and a butyl rubber and/or a halogenated butyl rubber, which is a copolymer rubber.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: February 4, 2014
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuto Yamakawa, Yuusuke Matsuya, Koji Sato
  • Patent number: 8580366
    Abstract: A hose for refrigerant transport use comprising an inner layer with superior deterioration resistance performance. The innermost layer comprised in the hose for refrigerant transport use of the present invention is formed using a polyamide resin composition comprising a polyamide and, per 100 parts by mass thereof, from 0.5 to 20 parts by mass of an acid acceptor.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: November 12, 2013
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuto Yamakawa, Yuusuke Matsuya, Koji Sato, Susumu Hatanaka, Hideyuki Oishi
  • Patent number: 8535773
    Abstract: A hose for transporting refrigerant of this invention is a hose comprising an inner tube layer including a gas barrier layer and a rubber layer adjacent to an outer surface of the gas barrier layer. The rubber layer comprises a rubber composition comprising from 1 to 15 parts by mass of an alkylphenol-formaldehyde resin and from 1 to 8 parts by mass of a hydrotalcite per 100 parts by mass of a raw rubber. The raw rubber comprises at least one selected from the group consisting of a BIMS and a butyl rubber and/or a halogenated butyl rubber, which is a copolymer rubber. The gas barrier layer comprises a polyamide resin composition comprising a modified polyamide obtained by blending a polyamide and a carboxyl group-containing modified polyolefin. The hose for transporting refrigerant of this invention has superior adhesion between the gas barrier layer and the rubber layer.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: September 17, 2013
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Yasuaki Shinoda, Kazuto Yamakawa
  • Publication number: 20130174933
    Abstract: A hose for transporting refrigerant includes an inner tube layer having a gas barrier layer and a rubber layer adjacent to the outer surface of the gas barrier layer. The gas barrier layer is formed using a thermoplastic resin composition comprising a polyamide resin and a modified rubber having an acid anhydride group or an epoxy group, the modified rubber being obtained by modifying a modified raw rubber having an acid anhydride group or an epoxy group with a hydrogen bond-forming compound having a functional group which reacts with the acid anhydride group or the epoxy group and a functional group which is able to form a hydrogen bond with an amide bond or a hydroxyl group. The rubber layer is formed using a rubber composition comprising from 1 to 15 parts by mass of an alkylphenol-formaldehyde resin per 100 parts by mass of a raw rubber.
    Type: Application
    Filed: August 8, 2011
    Publication date: July 11, 2013
    Applicant: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuto Yamakawa, Yasuaki Shinoda
  • Publication number: 20130068338
    Abstract: A hose for transporting refrigerant of this invention is a hose comprising an inner tube layer including a gas barrier layer and a rubber layer adjacent to an outer surface of the gas barrier layer. The rubber layer comprises a rubber composition comprising from 1 to 15 parts by mass of an alkylphenol-formaldehyde resin and from 1 to 8 parts by mass of a hydrotalcite per 100 parts by mass of a raw rubber. The raw rubber comprises at least one selected from the group consisting of a BIMS and a butyl rubber and/or a halogenated butyl rubber, which is a copolymer rubber. The gas barrier layer comprises a polyamide resin composition comprising a modified polyamide obtained by blending a polyamide and a carboxyl group-containing modified polyolefin. The hose for transporting refrigerant of this invention has superior adhesion between the gas barrier layer and the rubber layer.
    Type: Application
    Filed: May 31, 2011
    Publication date: March 21, 2013
    Applicant: The Yokohama Rubber Co., LTD.
    Inventors: Yasuaki Shinoda, Kazuto Yamakawa
  • Publication number: 20130056106
    Abstract: A hose for transporting refrigerant of the present technology includes an inner tube layer having a gas barrier layer and a rubber layer adjacent to an outer surface of the gas barrier layer. The gas barrier layer includes a polyamide resin composition obtained by blending from 0.5 to 20 parts by mass of a hydrotalcite per 100 parts by mass of a modified polyamide obtained by blending a polyamide and a carboxyl group-containing modified polyolefin. The rubber layer includes a rubber composition obtained by compounding from 1 to 15 parts by mass of an alkylphenol-formaldehyde resin per 100 parts by mass of a raw rubber. The raw rubber is at least one selected from the group consisting of a BIMS and a butyl rubber and/or a halogenated butyl rubber, which is a copolymer rubber.
    Type: Application
    Filed: April 27, 2010
    Publication date: March 7, 2013
    Applicant: The Yokohama Rubber Co., LTD.
    Inventors: Kazuto Yamakawa, Yusuke Matsuya, Koji Sato
  • Publication number: 20130025733
    Abstract: A hose for refrigerant transport use comprising an inner layer with superior deterioration resistance performance. The innermost layer comprised in the hose for refrigerant transport use of the present invention is formed using a polyamide resin composition comprising a polyamide and, per 100 parts by mass thereof, from 0.5 to 20 parts by mass of an acid acceptor.
    Type: Application
    Filed: February 9, 2012
    Publication date: January 31, 2013
    Inventors: Kazuto Yamakawa, Yuusuke Matsuya, Koji Sato, Susumu Hatanaka, Hideyuki Oishi
  • Publication number: 20120315472
    Abstract: A bonded body 10 of a carbon film covered article and a rubber is formed by bonding a carbon film covered article 13 having a carbon film 12 formed on a surface of an article 11 to an unvulcanized rubber 14 by affixing and vulcanizing. Thereby, a bonded body of rubber and, for example, metal can be provided without the need for an adhesive.
    Type: Application
    Filed: December 9, 2010
    Publication date: December 13, 2012
    Applicant: The Yokohama Rubber Co., LTD.
    Inventors: Kazuto Yamakawa, Yuusuke Matsuya
  • Publication number: 20120196068
    Abstract: A rubber laminate comprises a reinforcing layer and a second rubber layer laminated sequentially on a first rubber layer, at least one outer surface of the first rubber layer and the second rubber layer being covered with an ultra high molecular weight polyethylene layer, wherein the rubber layers covered with the ultra high molecular weight polyethylene layer are formed from a rubber composition comprising from 20 to 40 parts by mass of a softener per 100 parts by mass of a mixed rubber consisting of from 60 to 80% by mass ratio of a diene rubber and 20 to 40% by mass ratio of a ethylene-propylene-diene rubber and/or a butyl rubber.
    Type: Application
    Filed: December 28, 2009
    Publication date: August 2, 2012
    Applicant: The Yokohama Rubber Co., Ltd
    Inventors: Peng Gong, Kazuto Yamakawa, Naoto Torii, Akira Sato
  • Patent number: 8080298
    Abstract: An object of the present invention is to provide a hose which has a gas barrier layer and a rubber layer adhered without using an adhesive, and which has a dramatically improved durability compared to the conventional hose. The hose of the present invention is a refrigerant hose having an inner layer comprising a gas barrier layer and a rubber layer adhered to the outer surface of the gas barrier layer. The gas barrier layer comprises a modified polyamide prepared by blending a polyamide and a carboxyl group-containing modified polyolefin, and the rubber layer comprises a rubber composition prepared by blending a particular amount of an alkylphenol formaldehyde resin and a particular amount of carbon black with a raw rubber. The raw rubber comprises a BIMS, a copolymer rubber which is a butyl rubber and/or a halogenated butyl rubber, and an EPDM, the carbon black is specified, and no adhesive layer is formed between the gas barrier layer and the rubber layer.
    Type: Grant
    Filed: December 26, 2008
    Date of Patent: December 20, 2011
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Hideyuki Oishi, Kazuto Yamakawa, Koji Sato
  • Publication number: 20110186170
    Abstract: An object of the present invention is to provide a hose which has a gas barrier layer and a rubber layer adhered without using an adhesive, and which has a dramatically improved durability compared to the conventional hose. The hose of the present invention is a refrigerant hose having an inner layer comprising a gas barrier layer and a rubber layer adhered to the outer surface of the gas barrier layer. The gas barrier layer comprises a modified polyamide prepared by blending a polyamide and a carboxyl group-containing modified polyolefin, and the rubber layer comprises a rubber composition prepared by blending a particular amount of an alkylphenol formaldehyde resin and a particular amount of carbon black with a raw rubber. The raw rubber comprises a BIMS, a copolymer rubber which is a butyl rubber and/or a halogenated butyl rubber, and an EPDM, the carbon black is specified, and no adhesive layer is formed between the gas barrier layer and the rubber layer.
    Type: Application
    Filed: December 26, 2008
    Publication date: August 4, 2011
    Applicant: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Hideyuki Oishi, Kazuto Yamakawa, Koji Sato
  • Patent number: 7459212
    Abstract: A thermoplastic resin elastomer/rubber laminate comprising a rubber layer containing 100 parts by weight of a rubber and 0.1-20 parts by weight of an antioxidant preblended thereto and a thermoplastic resin elastomer composition layer, obtained by laminating at least two layers of the rubber layer and the thermoplastic resin elastomer composition layer followed by heating and pressing, whereby the antioxidant migrates from the rubber layer to the thermoplastic resin elastomer composition layer to improve the weathering resistance as well as a pneumatic tire using the same as an inner liner.
    Type: Grant
    Filed: December 24, 2004
    Date of Patent: December 2, 2008
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazuto Yamakawa, Masahiro Ikawa, Daisuke Kanenari, Yuichi Hara
  • Publication number: 20080223494
    Abstract: A pneumatic tire using as a tread part, a rubber composition containing a high silica-content rubber composition having a difference F-S between an amount of filler F and an amount of a softening agent S of 60 to 90 parts by weight and having a durometer hardness measured at 20° C. of 65 to 76.
    Type: Application
    Filed: August 2, 2007
    Publication date: September 18, 2008
    Applicant: The Yokohama Rubber Co., Ltd.
    Inventors: Naoya Amino, Yoshihiro Kameda, Kazuto Yamakawa, Akitomo Sato
  • Patent number: 7117911
    Abstract: A pneumatic tire having a runflat capability provided with a crescent shaped reinforcing rubber layer at the side part thereof, wherein an inner layer is composed of a thermoplastic elastomer composition containing (A) at least one thermoplastic resin having an air permeation coefficient of 100×10?12 cc·cm/cm2·sec·cmHg or less and a Young's modulus of more than 500 MPa and (B) at least one elastomer ingredient having an air permeation coefficient of 50×10?12 cc·cm/cm2·sec·cmHg or more and a Young's modulus of 500 MPa or less in amounts of at least 30% by weight based upon the total polymer ingredients and having an air permeation coefficient of 100×10?12 cc·cm/cm2·sec·cmHg or less.
    Type: Grant
    Filed: September 2, 2002
    Date of Patent: October 10, 2006
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Daisuke Kanenari, Kazuto Yamakawa
  • Publication number: 20060182976
    Abstract: A thermoplastic resin elastomer/rubber laminate comprising a rubber layer containing 100 parts by weight of a rubber and 0.1-20 parts by weight of an antioxidant preblended thereto and a thermoplastic resin elastomer composition layer, obtained by laminating at least two layers of the rubber layer and the thermoplastic resin elastomer composition layer followed by heating and pressing, whereby the antioxidant migrates from the rubber layer to the thermoplastic resin elastomer composition layer to improve the weathering resistance as well as a pneumatic tire using the same as an inner liner.
    Type: Application
    Filed: December 24, 2004
    Publication date: August 17, 2006
    Inventors: Kazuto Yamakawa, Masahiro Ikawa, Daisuke Kanenari, Yuichi Hara