Patents by Inventor Yasunori Nagakura

Yasunori Nagakura 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: 10406762
    Abstract: A carbon-fiber-reinforced resin composite material includes: carbon fibers including carbon fiber bundles and a thermoplastic resin, in which (1) a coefficient of variation (CV1) of a total areal weight of the carbon-fiber-reinforced resin composite material is 10% or lower, (2) a coefficient of variation (CV2) of a carbon fiber volume fraction (Vf) in the carbon-fiber-reinforced resin composite material which is defined by Expression (a) is 15% or lower, and (3) a weight average fiber length of the carbon fibers is 1 to 100 mm. Carbon Fiber Volume Fraction (Vf)=100×Volume of Carbon Fibers/(Volume of Carbon Fibers+Volume of Thermoplastic Resin)??Expression (a).
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: September 10, 2019
    Assignee: Teijin Limited
    Inventors: Shuhei Onoue, Makoto Ootsubo, Yasunori Nagakura, Naoaki Sonoda
  • Patent number: 10322559
    Abstract: There is provided a shaped product made of a fiber-reinforced composite material including reinforcing fibers having an average fiber length of 5 to 100 mm and a thermoplastic resin. In the shaped product, a volume fraction of reinforcing fibers is 5 to 80%, a reference plane (S) and a standing plane (B) inclined at an angle of 45 to 90 degrees with respect to the reference plane are included, a ratio of an area of the standing plane (B) to an area of the reference plane (S) is 0.5 to 100, and in the fiber-reinforced composite material constituting the shaped product, a ratio of a reinforcing fiber bundle (A) including the reinforcing fibers of a critical number of single fiber or more to the total amount of the reinforcing fibers is 20 Vol % or more and 99 Vol % or less.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: June 18, 2019
    Assignee: Teijin Limited
    Inventors: Michiharu Taniguchi, Motoomi Arakawa, Toru Sugiyama, Yasunori Nagakura
  • Publication number: 20190118487
    Abstract: The problem to be solved by the invention is to provide a method for producing a joined body that reduces springback and can maintain high joining strength. The above problem is solved by a method for producing a joined body. The method includes heating a contact expected surface (a) of a molded body (A) containing carbon fibers and a thermoplastic resin, brining the heated contact expected surface (a) into contact with a contact expected surface (b) of a molded body (B) containing a thermoplastic resin; and joining the molded body (A) and the molded body (B). Contact surfaces (c) formed by contacting the contact expected surface (a) with the contact expected surface (b) includes a three-dimensional curved surface. The contact expected surface (a) is heated by using an infrared radiation mechanism capable of selectively infrared radiating the contact expected surface (a).
    Type: Application
    Filed: April 14, 2016
    Publication date: April 25, 2019
    Applicant: Teijin Limited
    Inventors: Takumi Kato, Yasunori Nagakura
  • Patent number: 10006677
    Abstract: The present invention provides a method for manufacturing a shaped product constituted by a fiber-reinforced composite material including reinforcing fibers and a thermoplastic resin. The shaped product maintains isotropy of the fibers to the end thereof even if press-molded under conditions in which charge ratio of a prepreg to a die is low. Specifically, the method includes using a specific prepreg obtained by impregnating the reinforcing fibers with thermoplastic resin, and molding-processing the prepreg under specific conditions.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: June 26, 2018
    Assignee: Teijin Limited
    Inventors: Michiharu Taniguchi, Motoomi Arakawa, Yasunori Nagakura, Tsukasa Arai, Akihiko Obata
  • Publication number: 20180001577
    Abstract: A carbon-fiber-reinforced resin composite material includes: carbon fibers including carbon fiber bundles and a thermoplastic resin, in which (1) a coefficient of variation (CV1) of a total areal weight of the carbon-fiber-reinforced resin composite material is 10% or lower, (2) a coefficient of variation (CV2) of a carbon fiber volume fraction (Vf) in the carbon-fiber-reinforced resin composite material which is defined by Expression (a) is 15% or lower, and (3) a weight average fiber length of the carbon fibers is 1 to 100 mm. Carbon Fiber Volume Fraction (Vf)=100×Volume of Carbon Fibers/(Volume of Carbon Fibers+Volume of Thermoplastic Resin) . . . Expression (a).
    Type: Application
    Filed: September 18, 2017
    Publication date: January 4, 2018
    Applicant: Teijin Limited
    Inventors: Shuhei Onoue, Makoto Ootsubo, Yasunori Nagakura, Naoaki Sonoda
  • Patent number: 9855689
    Abstract: There is provided a shaped product made of a fiber-reinforced composite material including reinforcing fibers having an average length of 5 mm or more and 100 mm or less and a thermoplastic resin, in which a volume fraction of reinforcing fibers (Vf=100×volume of reinforcing fibers/(volume of reinforcing fibers+volume of thermoplastic resin)) is 5 to 80%, grains are formed on a surface of the shaped product, and a ratio of a reinforcing fiber bundle (A) including the reinforcing fibers of a critical number of single fiber or more, the critical number defined by Formula (1), to the total amount of the reinforcing fibers is 20 Vol % or more and 99 Vol % or less: Critical number of single fiber=600/D??(1) (wherein D is an average fiber diameter (?m) of single reinforcing fiber).
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: January 2, 2018
    Assignee: Teijin Limited
    Inventors: Motoomi Arakawa, Toru Sugiyama, Michiharu Taniguchi, Yasunori Nagakura
  • Patent number: 8992811
    Abstract: This method for manufacturing a shaped product is characterized in preparing a specific random mat including a thermoplastic resin and carbon fiber bundles having an average fiber length of 5-100 mm, impregnating a thermoplastic resin into the random mat, pressing the random mat in a metal mold in a range of 0.1-20 MPa, and then taking out the random mat from the metal mold.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: March 31, 2015
    Assignee: Teijin Limited
    Inventors: Yasunori Nagakura, Motoomi Arakawa, Michiharu Taniguchi, Akihiko Obata
  • Publication number: 20150064408
    Abstract: The present invention provides a method for manufacturing a shaped product constituted by a fiber-reinforced composite material including reinforcing fibers and a thermoplastic resin. The shaped product maintains isotropy of the fibers to the end thereof even if press-molded under conditions in which charge ratio of a prepreg to a die is low. Specifically, the method includes using a specific prepreg obtained by impregnating the reinforcing fibers with thermoplastic resin, and molding-processing the prepreg under specific conditions.
    Type: Application
    Filed: October 31, 2014
    Publication date: March 5, 2015
    Applicant: TEIJIN LIMITED
    Inventors: Michiharu Taniguchi, Motoomi Arakawa, Yasunori Nagakura, Tsukasa Arai, Akihiko Obata
  • Publication number: 20140370245
    Abstract: A method for manufacturing a shaped product includes 1) heating at least three prepregs having a thickness of 0.3 mm to 5.0 mm each including reinforcing fibers having an average fiber length of 3 to 100 mm and a thermoplastic resin, 2) arranging those prepregs so as to constitute at least two layers including P layer and Q layer which are in contact with each other, and 3) then pressing those layers to manufacture one shaped product. A prepreg (p1) in the P layer and a prepreg (q1) in the Q layer are arranged such that at least a part thereof overlaps with each other, and two or more prepregs in the same layer are arranged so as not to be in contact with each other.
    Type: Application
    Filed: December 20, 2012
    Publication date: December 18, 2014
    Applicant: Teijin Limited
    Inventors: Yasunori Nagakura, Yasuyuki Yokoe, Yutaka Kondou, Motoomi Arakawa
  • Patent number: 8900502
    Abstract: The present invention provides a method for manufacturing a shaped product constituted by a fiber-reinforced composite material including reinforcing fibers and a thermoplastic resin, the shaped product with maintained isotropy of the fibers to the end thereof even if press-molded under conditions in which charge ratio of a prepreg to a die is low. Specifically, the method includes using a specific prepreg obtained by impregnating the reinforcing fibers with thermoplastic resin, and molding-processing the prepreg under specific conditions.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: December 2, 2014
    Assignee: Teijin Limited
    Inventors: Michiharu Taniguchi, Motoomi Arakawa, Yasunori Nagakura, Tsukasa Arai, Akihiko Obata
  • Publication number: 20140186584
    Abstract: There is provided a shaped product made of a fiber-reinforced composite material including reinforcing fibers having an average length of 5 mm or more and 100 mm or less and a thermoplastic resin, in which a volume fraction of reinforcing fibers (Vf=100×volume of reinforcing fibers/(volume of reinforcing fibers+volume of thermoplastic resin)) is 5 to 80%, grains are formed on a surface of the shaped product, and a ratio of a reinforcing fiber bundle (A) including the reinforcing fibers of a critical number of single fiber or more, the critical number defined by Formula (1), to the total amount of the reinforcing fibers is 20 Vol % or more and 99 Vol % or less: Critical number of single fiber=600/D??(1) (wherein D is an average fiber diameter (?m) of single reinforcing fiber).
    Type: Application
    Filed: March 6, 2014
    Publication date: July 3, 2014
    Applicant: Teijin Limited
    Inventors: Motoomi Arakawa, Toru Sugiyama, Michiharu Taniguchi, Yasunori Nagakura
  • Publication number: 20140178653
    Abstract: This production method for a composite shaped product having an undercut portion is able to readily manufacture a composite shaped product having a complicated shape having an undercut portion, by including: a step (i) of forming an impregnated precursor by heating and pressurizing a non-impregnated precursor including carbon fibers with an average fiber length of 1 to 100 mm and a thermoplastic resin; a step (ii) of heating the impregnated precursor at the melting point of the thermoplastic resin or more; a step (iii) of arranging the heated impregnated precursor into a mold having an undercut structure; a step (iv) of clamping the undercut structure after or simultaneously being operated and pressurizing the impregnated precursor; and a step (v) of unclamped the mold, re-operating the undercut structure and taking out the composite shaped material from the unclamped mold.
    Type: Application
    Filed: February 28, 2014
    Publication date: June 26, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Yasunori Nagakura, Motoomi Arakawa
  • Publication number: 20140178631
    Abstract: There is provided a shaped product made of a fiber-reinforced composite material including reinforcing fibers having an average fiber length of 5 to 100 mm and a thermoplastic resin. In the shaped product, a volume fraction of reinforcing fibers is 5 to 80%, a reference plane (S) and a standing plane (B) inclined at an angle of 45 to 90 degrees with respect to the reference plane are included, a ratio of an area of the standing plane (B) to an area of the reference plane (S) is 0.5 to 100, and in the fiber-reinforced composite material constituting the shaped product, a ratio of a reinforcing fiber bundle (A) including the reinforcing fibers of a critical number of single fiber or more to the total amount of the reinforcing fibers is 20 Vol % or more and 99 Vol % or less.
    Type: Application
    Filed: February 27, 2014
    Publication date: June 26, 2014
    Applicant: Teijin Limited
    Inventors: Michiharu Taniguchi, Motoomi Arakawa, Toru Sugiyama, Yasunori Nagakura
  • Publication number: 20140148072
    Abstract: This method for manufacturing a shaped product is characterized in preparing a specific random mat including a thermoplastic resin and carbon fiber bundles having an average fiber length of 5-100 mm, impregnating a thermoplastic resin into the random mat, pressing the random mat in a metal mold in a range of 0.1-20 MPa, and then taking out the random mat from the metal mold.
    Type: Application
    Filed: February 3, 2014
    Publication date: May 29, 2014
    Applicant: Tenjin Limited
    Inventors: Yasunori Nagakura, Motoomi Arakawa, Michiharu Taniguchi, Akihiko Obata
  • Publication number: 20140077412
    Abstract: The present invention provides a method for manufacturing a shaped product constituted by a fiber-reinforced composite material including reinforcing fibers and a thermoplastic resin, the shaped product with maintained isotropy of the fibers to the end thereof even if press-molded under conditions in which charge ratio of a prepreg to a die is low. Specifically, the method includes using a specific prepreg obtained by impregnating the reinforcing fibers with thermoplastic resin, and molding-processing the prepreg under specific conditions.
    Type: Application
    Filed: November 27, 2013
    Publication date: March 20, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Michiharu Taniguchi, Motoomi Arakawa, Yasunori Nagakura, Tsukasa Arai, Akihiko Obata
  • Publication number: 20140004308
    Abstract: A molded product, including a fiber-reinforced composite material containing reinforcing fibers having an average fiber length of 5 mm to 100 mm and a thermoplastic resin, wherein the molded product has thickness gradient, an amount of the thermoplastic resin is 10 to 1,000 parts by weight per 100 parts by weight of thee reinforcing fibers, and the reinforcing fibers have a fiber areal weight of from 25 g/m2 to 3,000 g/m2 and are substantially two-dimensionally randomly oriented.
    Type: Application
    Filed: August 7, 2013
    Publication date: January 2, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Michiharu Taniguchi, Masaru Sato, Koji Suzuki, Toru Sugiyama, Yasunori Nagakura, Motoomi Arakawa
  • Publication number: 20090114520
    Abstract: A novel method of producing charcoal. The method of producing charcoal comprises treating an organic material with iodine followed by the carbonization treatment. The organic material is desirably an organic material stemming from the biomass. The treatment with iodine is desirably conducted by bringing an iodine vapor into contact with the organic material. Further, the treatment with iodine is desirably conducted by heating a container which contains the organic material and iodine. The temperature in the treatment with iodine is desirably in a range of not lower than 50° C. but not higher than a decomposition temperature of the organic material. Further, the carbonization treatment is desirably a heat treatment conducted in an inert gas atmosphere or in vacuum.
    Type: Application
    Filed: December 5, 2006
    Publication date: May 7, 2009
    Applicant: TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Eiichi Yasuda, Yasuhiro Tanabe, Yasunori Nagakura
  • Publication number: 20040116530
    Abstract: The invention provides a pharmaceutical composition containing, as the active ingredient thereof, a prostaglandin-I2 agonist, therefore providing a remedy or preventive for various disorders resulting from tissue fibrogenesis.
    Type: Application
    Filed: October 16, 2003
    Publication date: June 17, 2004
    Inventors: Noriaki Maeda, Yasunori Nagakura, Mariko Ota, Yoshitaka Hirayama, Tatsuya Sasakawa, Tomoya Oe