Patents by Inventor Kohei Oka

Kohei Oka 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: 10428894
    Abstract: Provided is a resin-made impact absorption member including: an impact absorption portion which includes a fiber-reinforced resin material containing reinforcing fibers and a thermoplastic resin and has a hollow structure including an outer cylindrical portion and a hollow portion, in which the reinforcing fiber has an average fiber length of 1 mm to 100 mm, the thermoplastic resin has a fracture elongation of 10% or more, the fiber-reinforced resin material has a compressive elastic modulus of 10 GPa or more and a compressive strength of 150 MPa to 500 MPa, and in the impact absorption portion, a maximum value of a ratio L1/t1 of a distance L1 from a position of the center of gravity to the outer cylindrical portion on a same section in a sectional shape in a direction orthogonal to an impact absorption direction, to a thickness t1 of the outer cylindrical portion, is 40 or less.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: October 1, 2019
    Assignee: Teijin Limited
    Inventors: Shuhei Onoue, Tadashi Yamaji, Keizo Yokoyama, Kohei Oka
  • Patent number: 10257087
    Abstract: Provided is a communication device in which communication between hosts of a layer 2 network is overlaid on a layer 3 network. The communication device manages a first MTU length of each communication path with respect to a plurality of communication paths in the layer 3 network, determines a second MTU length based on information to be added in cases where communication between the hosts of the layer 2 network is overlaid via the plurality of communication paths, and notifies the hosts of the second MTU length.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: April 9, 2019
    Assignee: Alaxala Networks Corporation
    Inventors: Yasunori Yamamoto, Motohide Noumi, Kohei Oka
  • Publication number: 20170339055
    Abstract: Provided is a communication device in which communication between hosts of a layer 2 network is overlaid on a layer 3 network. The communication device manages a first MTU length of each communication path with respect to a plurality of communication paths in the layer 3 network, determines a second MTU length based on information to be added in cases where communication between the hosts of the layer 2 network is overlaid via the plurality of communication paths, and notifies the hosts of the second MTU length.
    Type: Application
    Filed: April 24, 2017
    Publication date: November 23, 2017
    Inventors: Yasunori YAMAMOTO, Motohide NOUMI, Kohei OKA
  • Publication number: 20160356334
    Abstract: Provided is a resin-made impact absorption member including: an impact absorption portion which includes a fiber-reinforced resin material containing reinforcing fibers and a thermoplastic resin and has a hollow structure including an outer cylindrical portion and a hollow portion, in which the reinforcing fiber has an average fiber length of 1 mm to 100 mm, the thermoplastic resin has a fracture elongation of 10% or more, the fiber-reinforced resin material has a compressive elastic modulus of 10 GPa or more and a compressive strength of 150 MPa to 500 MPa, and in the impact absorption portion, a maximum value of a ratio L1/t1 of a distance L1 from a position of the center of gravity to the outer cylindrical portion on a same section in a sectional shape in a direction orthogonal to an impact absorption direction, to a thickness t1 of the outer cylindrical portion, is 40 or less.
    Type: Application
    Filed: February 5, 2015
    Publication date: December 8, 2016
    Applicant: Teijin Limited
    Inventors: Shuhei ONOUE, Tadashi YAMAJI, Keizo YOKOYAMA, Kohei OKA
  • Patent number: 8431525
    Abstract: There has been a need for coelenteramide analogs or the like that produce fluorescent proteins which exhibit different fluorescent characteristics from those of the existing fluorescent proteins. Disclosed is a compound represented by general formula (1) (wherein R1 represents a substituted or unsubstituted aryl, a substituted or unsubstituted arylalkyl, a straight or branched alkyl which may optionally be substituted with an alicyclic group, an alicyclic group or a heterocyclic group; R2 represents hydrogen or —(SO2)R4; R3 represents hydrogen, hydroxyl, methoxy or acetoxy; R4 represents a substituted or unsubstituted aryl, a substituted or unsubstituted arylalkyl or a straight or branched alkyl which may optionally be substituted with an alicyclic group; and X1 represents —C(?S)— or —SO2—).
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: April 30, 2013
    Assignees: JNC Corporation, Tokyo Institute of Technology
    Inventors: Takamitsu Hosoya, Kohei Oka, Satoshi Inouye
  • Patent number: 8235735
    Abstract: A terminal joining structure includes a terminal having a tubular barrel portion and a flange portion that is integrally formed at the axis-direction end of the barrel portion, a conductor substrate on which is opened a through-hole for inserting the barrel portion, and a ring that fits on the barrel portion on the opposite side of the conductor substrate. On the barrel portion is formed a taper that increases in diameter toward the flange portion. The diameter of the larger-diameter portion of the taper is larger than the inner diameter of the through-hole. The terminal is caulked to cause radially outward expansion of an end part of the barrel portion, which passes through the ring, on the opposite side of the conductor substrate and is fixed to the conductor substrate together with the ring.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: August 7, 2012
    Assignees: Mitsubishi Electric Corporation, Ryoden Kasei Co., Ltd.
    Inventors: Kohei Oka, Shozo Sakaue, Shunichi Kitayama, Yoichi Hisamori, Yoshitaka Ono, Toshikazu Karita, Tetsuya Takahashi
  • Publication number: 20110288280
    Abstract: There has been a need for coelenteramide analogs or the like that produce fluorescent proteins which exhibit different fluorescent characteristics from those of the existing fluorescent proteins. Disclosed is a compound represented by general formula (1) (wherein R1 represents a substituted or unsubstituted aryl, a substituted or unsubstituted arylalkyl, a straight or branched alkyl which may optionally be substituted with an alicyclic group, an alicyclic group or a heterocyclic group; R2 represents hydrogen or —(SO2)R4; R3 represents hydrogen, hydroxyl, methoxy or acetoxy; R4 represents a substituted or unsubstituted aryl, a substituted or unsubstituted arylalkyl or a straight or branched alkyl which may optionally be substituted with an alicyclic group; and X1 represents —C(?S)— or —SO2—).
    Type: Application
    Filed: February 8, 2010
    Publication date: November 24, 2011
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, JNC CORPORATION
    Inventors: Takamitsu Hosoya, Kohei Oka, Satoshi Inouye
  • Publication number: 20110003519
    Abstract: A terminal joining structure includes a terminal having a tubular barrel portion and a flange portion that is integrally formed at the axis-direction end of the barrel portion, a conductor substrate on which is opened a through-hole for inserting the barrel portion, and a ring that fits on the barrel portion on the opposite side of the conductor substrate. On the barrel portion is formed a taper that increases in diameter toward the flange portion. The diameter of the larger-diameter portion of the taper is larger than the inner diameter of the through-hole. The terminal is caulked to cause radially outward expansion of an end part of the barrel portion, which passes through the ring, on the opposite side of the conductor substrate and is fixed to the conductor substrate together with the ring.
    Type: Application
    Filed: January 30, 2008
    Publication date: January 6, 2011
    Applicants: Mitsubishi Electric Corporation, Ryoden Kasei Co., Ltd.
    Inventors: Kohei Oka, Shozo Sakaue, Shunichi Kitayama, Yoichi Hisamori, Yoshitaka Ono, Toshikazu Karita, Tetsuya Takahashi