Patents by Inventor Kohei Takemura

Kohei Takemura 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).

  • Patent number: 9416234
    Abstract: There is provided a crosslinkable fluorine-containing rubber composition being capable of giving a fluorine-containing rubber crosslinked and molded article having a low friction coefficient and assuring an increased proportion of a fluorine-containing resin around the surface of a fluorine-containing rubber, a molded article obtained by crosslinking the composition, and a method for producing the molded article. The crosslinkable fluorine-containing rubber composition comprises a fluorine-containing rubber (A) comprising vinylidene fluoride unit, a fluorine-containing resin (B) and a polyol crosslinking agent (C), wherein the fluorine-containing rubber (A) and the fluorine-containing resin (B) are kneaded at a temperature of not less than a temperature being lower by 5° C. than the melting point of the fluorine-containing resin (B).
    Type: Grant
    Filed: September 7, 2009
    Date of Patent: August 16, 2016
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Kohei Takemura, Tomihiko Yanagiguchi, Kazuyoshi Kawasaki
  • Publication number: 20110184126
    Abstract: There is provided a crosslinkable fluorine-containing rubber composition being capable of giving a fluorine-containing rubber crosslinked and molded article having a low friction coefficient and assuring an increased proportion of a fluorine-containing resin around the surface of a fluorine-containing rubber, a molded article obtained by crosslinking the composition, and a method for producing the molded article. The crosslinkable fluorine-containing rubber composition comprises a fluorine-containing rubber (A) comprising vinylidene fluoride unit, a fluorine-containing resin (B) and a polyol crosslinking agent (C), wherein the fluorine-containing rubber (A) and the fluorine-containing resin (B) are kneaded at a temperature of not less than a temperature being lower by 5° C. than the melting point of the fluorine-containing resin (B).
    Type: Application
    Filed: September 7, 2009
    Publication date: July 28, 2011
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kohei Takemura, Tomihiko Yanagiguchi, Kazuyoshi Kawasaki
  • Patent number: 6864305
    Abstract: A puncture sealing agent for a tire is at least comprising a rubber latex, an adhesive agent, and an antifreezing agent, wherein propylene glycol is used as the antifreezing agent, and further the ratio of the propylene-glycol to the total weight of the puncture sealing agent is set from 20 to 40% by weight.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: March 8, 2005
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Masahiro Kishida, Yoshihide Kojima, Kohei Takemura, Akihiko Hamada, Naoya Ichikawa
  • Patent number: 6688992
    Abstract: A golf ball superior in resilience performance, cut resistance and spin performance is provided. The golf ball is composed of a core and a cover surrounding the core. The cover is formed of a composition having 0.5-20 parts by weight of organic short fiber blended with respect to 100 parts by weight of a polymer component having thermoplastic elastomer as its main component. Thermoplastic resin may also be blended in the polymer component. The cover composition has a flexural rigidity of 80-300 MPa, and the cover surface has a Shore D hardness of 41-56.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: February 10, 2004
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Kohei Takemura, Seigo Sakagami
  • Patent number: 6626770
    Abstract: The present invention provides a multi-piece solid golf ball having excellent rebound characteristics when hitting at low head speed because the rebound characteristics do not depend on the head speed at the time of hitting.
    Type: Grant
    Filed: December 6, 2000
    Date of Patent: September 30, 2003
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Kohei Takemura, Masatoshi Yokota, Seigou Sakagami
  • Patent number: 6569036
    Abstract: A multi-layer solid golf ball has small impact force and good shot feel at the time of hitting, and excellent rebound characteristics when hitting at low head speed because the rebound characteristics do not depend on the head speed at the time of hitting. The multi-layer solid golf ball core is composed of an inner layer core, intermediate layer core formed on the inner layer core and an outer layer core formed on the intermediate layer core, and one or more layers of cover on the outer layer core, wherein the inner layer core has a deformation amount (X) 3.0 to 4.5 mm, a two-layer core composed of the inner layer core and the intermediate layer core has a deformation amount (Y) 3.5 to 6.0 mm, a three-layer core composed of the two-layer core with the outer layer core has a deformation amount (Z) 3.0 to 5.0 mm.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: May 27, 2003
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Kohei Takemura, Kazuhisa Fushihara
  • Publication number: 20030064830
    Abstract: The present invention provides a golf ball having excellent flyer resistance at a shot on the rough, and having high rebound characteristics and excellent flight performance. The present invention relates to a golf ball comprising a core having a single-layered structure or a multi-layered structure and a cover covering the core, wherein the cover has a complex elastic modulus at −10° C. of 20 to 150 MPa and loss tangent (tan &dgr;) at −10° C. of not less than 0.05, as determined from temperature-dependent curves of the complex elastic modulus and tan &dgr; obtained by dynamic viscoelastic measurement at a frequency of 10 Hz, a dynamic strain of 5% and a heating rate of 4° C./min.
    Type: Application
    Filed: April 30, 2002
    Publication date: April 3, 2003
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Kazuhisa Fushihara, Kohei Takemura
  • Patent number: 6541574
    Abstract: A core is enveloped by a cover with trans 1,4-polyisoprene as the main component, including a super accelerator formed of dithiocarbamate and/or xanthate, and vulcanized at a temperature lower than the melting point of trans 1,4-polyisoprene to provide a golf ball having high impact resilience and spinning performance. Also, a core is enveloped by an inner layer cover having trans 1,4-polyisoprene as the main component, including a super accelerator formed of dithiocarbamate and/or xanthate, and the inner layer cover is surrounded by an outer layer cover with trans 1,4-polyisoprene as the main component, including a super accelerator of an amount larger than that in the inner layer cover to provide a golf ball having high impact resilience and spinning performance, and whose cover material is sufficiently anchored.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: April 1, 2003
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Kohei Takemura, Kazuhisa Fushihara, Seigou Sakagami, Kaname Yamada
  • Publication number: 20030050365
    Abstract: A puncture sealing agent for a tire is at least comprising a rubber latex, an adhesive agent, and an antifreezing agent, wherein propylene glycol is used as the antifreezing agent, and further the ratio of the propylene-glycol to the total weight of the puncture sealing agent is set from 20 to 40% by weight.
    Type: Application
    Filed: September 10, 2002
    Publication date: March 13, 2003
    Inventors: Masahiro Kishida, Yoshihide Kojima, Kohei Takemura, Akihiko Hamada, Naoya Ichikawa
  • Patent number: 6464600
    Abstract: The present invention provides a golf ball having high rebound characteristics and exceptional controllability at approach shot from the rough, which accomplished by controlling its cover material morphology. The present invention relates a golf ball comprising a core and a cover covering the core, wherein the base resin of the cover is formed from a material having at least two phases whose phase angle difference is at least 2 degrees as measured by using an atomic force microscope; a maximum phase angle phase, which is contained in the base resin of the cover and has an absolute value of a maximum phase angle, is present in the form of a continuous matrix; and a minimum phase angle phase, which has an absolute value of a minimum phase angle, is present in discrete locations within the matrix.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: October 15, 2002
    Assignee: Sumitomo Rubber Industries, Inc.
    Inventors: Kohei Takemura, Seigou Sakagami, Hiroyuki Kishimoto
  • Publication number: 20020061795
    Abstract: A golf ball with improved spin performance, i.e., controllability with an iron, as well as improved resilience and scratch resistance is provided. A mixture of polyurethane-type thermoplastic elastomer and a metal compound (other than titanate oxide), for instance, zinc oxide or magnesium oxide, is used as a cover material of the golf ball. More preferably, the metal compound is mixed at 5 to 15 parts by weight for 100 parts by weight of polyurethane-type thermoplastic elastomer, and the Shore D hardness of the cover material of the golf ball is in the range of 30 to 60.
    Type: Application
    Filed: August 30, 2001
    Publication date: May 23, 2002
    Inventor: Kohei Takemura
  • Publication number: 20020045501
    Abstract: A golf ball superior in resilience performance, cut resistance and spin performance is provided. The golf ball is composed of a core and a cover surrounding the core. The cover is formed of a composition having 0.5-20 parts by weight of organic short fiber blended with respect to 100 parts by weight of a polymer component having thermoplastic elastomer as its main component. Thermoplastic resin may also be blended in the polymer component. The cover composition has a flexural rigidity of 80-300 MPa, and the cover surface has a Shore D hardness of 41-56.
    Type: Application
    Filed: August 24, 2001
    Publication date: April 18, 2002
    Inventors: Kohei Takemura, Seigo Sakagami
  • Publication number: 20020045499
    Abstract: A golf ball is provided which exhibits good rebound performance, long flight distance and favorable anti-flier characteristics and is excellent in hit feeling and controllability. The golf ball is composed of a core and a cover surrounding the core. The cover is formed by vulcanizing a cover composition including thermoplastic elastomer, trans structure-containing rubber and ionomer resin.
    Type: Application
    Filed: August 14, 2001
    Publication date: April 18, 2002
    Inventors: Kohei Takemura, Seigo Sakagami
  • Patent number: 6361455
    Abstract: A golf ball having excellent resistance to a flyer type golf shot normally produced when a golf shot is executed from the rough, and also having excellent cut resistance and high rebound characteristics, wherein the golf ball cover has a shear modulus (G) of 3 to 100 MPa, a Young's modulus (E) of 9 to 400 MPa, and a ratio (E/G) of 2.4 to 3.0.
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: March 26, 2002
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Kohei Takemura
  • Publication number: 20020032082
    Abstract: The present invention provides a golf ball having excellent flyer resistance at a shot on the rough, and having high rebound characteristics and excellent flight performance. The present invention relates to a golf ball comprising a core having a single-layered structure or a multi-layered structure and a cover covering the core, wherein the cover has a complex elastic modulus at −10° C. of 20 to 150 MPa and loss tangent (tan &dgr;) at −10° C. of not less than 0.05, as determined from temperature-dependent curves of the complex elastic modulus and tan &dgr; obtained by dynamic viscoelastic measurement at a frequency of 10 Hz, a dynamic strain of 5% and a heating rate of 4° C./min.
    Type: Application
    Filed: July 17, 2001
    Publication date: March 14, 2002
    Inventors: Kazuhisa Fushihara, Kohei Takemura
  • Publication number: 20010029211
    Abstract: The present invention provides a golf ball having high rebound characteristics and exceptional controllability at approach shot from the rough, which accomplished by controlling its cover material morphology. The present invention relates a golf ball comprising a core and a cover covering the core, wherein the base resin of the cover is formed from a material having at least two phases whose phase angle difference is at least 2 degrees as measured by using an atomic force microscope; a maximum phase angle phase, which is contained in the base resin of the cover and has an absolute value of a maximum phase angle, is present in the form of a continuous matrix; and a minimum phase angle phase, which has an absolute value of a minimum phase angle, is present in discrete locations within the matrix.
    Type: Application
    Filed: December 28, 2000
    Publication date: October 11, 2001
    Inventors: Kohei Takemura, Seigou Sakagami, Hiroyuki Kishimoto
  • Publication number: 20010011045
    Abstract: The present invention provides a multi-piece solid golf ball having excellent rebound characteristics when hitting at low head speed because the rebound characteristics do not depend on the head speed at the time of hitting.
    Type: Application
    Filed: December 6, 2000
    Publication date: August 2, 2001
    Inventors: Kohei Takemura, Masatoshi Yokota, Seigou Sakagami
  • Patent number: 5967907
    Abstract: The present invention provides a multi-piece solid golf ball having excellent durability, excellent shot feel when hitting and good productivity. The present invention relates to a multi-piece solid golf ball which includes a solid core having a inner core and at least one outer core layer formed on the inner core, and a cover covering the solid core, wherein the inner core and outer core are formed from the material obtained by dispersing rubber in an ionomer resin and dynamically vulcanizing it with a vulcanizing agent, wherein the rubber particles dispersed in the ionomer resin have a particle size of not more than 10 .mu.m, the outer core layer has a Shore D hardness of more than that of the inner core by 5 to 30, and a weight ratio of the ionomer resin to the rubber particles is within the range of 95:5 to 30:70.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: October 19, 1999
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Kohei Takemura, Akihiro Nakahara, Akihiko Hamada