Patents by Inventor Keiichi Kohama

Keiichi Kohama 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: 10280530
    Abstract: To provide a single crystal production apparatus that is capable of prolonging the lifetime of a heater, and capable of reducing the cost. A single crystal production apparatus of the present invention is the single crystal production apparatus which produces a single crystal of a metal oxide in an oxidative atmosphere, containing: a base body; a cylindrical furnace body having heat resistance disposed above the base body; a lid member occluding the furnace body; a heater disposed inside the furnace body; a high frequency coil heating the heater through high frequency induction heating; and a crucible heated with the heater, the heater containing a Pt-based alloy and having a zirconia coating on an overall surface of the heater.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: May 7, 2019
    Assignees: FUJIKOSHI MACHINERY CORP., SHINSHU UNIVERSITY
    Inventors: Keigo Hoshikawa, Yasuyuki Fujiwara, Keiichi Kohama, Shinji Nakanishi, Takumi Kobayashi, Etsuko Ohba
  • Publication number: 20180251908
    Abstract: To provide a single crystal production apparatus that is capable of prolonging the lifetime of a heater, and capable of reducing the cost. A single crystal production apparatus of the present invention is the single crystal production apparatus which produces a single crystal of a metal oxide in an oxidative atmosphere, containing: a base body; a cylindrical furnace body having heat resistance disposed above the base body; a lid member occluding the furnace body; a heater disposed inside the furnace body; a high frequency coil heating the heater through high frequency induction heating; and a crucible heated with the heater, the heater containing a Pt-based alloy and having a zirconia coating on an overall surface of the heater.
    Type: Application
    Filed: January 10, 2018
    Publication date: September 6, 2018
    Inventors: Keigo HOSHIKAWA, Yasuyuki Fujiwara, Keiichi Kohama, Shinji Nakanishi, Takumi Kobayashi, Etsuko Ohba
  • Patent number: 8974720
    Abstract: The present invention provides a method for producing a ceramic laminate capable of preventing coming-off of materials and warpage of the ceramic laminate by a heat treatment at a relatively-low temperature, and a ceramic laminate produced by the production method. Disclosed is a method for producing a ceramic laminate having a layer structure in which two or more layers are laminated, including: a step of producing a laminate including a first layer and a second layer, the first layer containing a solid electrolyte and the second layer containing at least composite particles obtained by covering an electrode active material with the solid electrolyte; and a step of performing a heat treatment on the laminate including the first and second layers at a temperature of 500° C. or more and less than 700° C.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: March 10, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Chihiro Yada, Yoshitaka Minamida, Keiichi Kohama
  • Publication number: 20130183589
    Abstract: A battery sintered body, in which charge-discharge properties are restrained from deteriorating in accordance with sintering, and a producing method thereof. A battery sintered body includes: a phosphate compound of a nasicon type as a solid electrolyte material; and any one of an oxide of a spinel type containing at least one of Ni and Mn, LiCoO2 and a transition metal oxide as an active material, wherein a component except a component of the above-mentioned solid electrolyte material and a component of the above-mentioned active material is not detected on an interface between the above-mentioned solid electrolyte material and the above-mentioned active material in analyzing by an X-ray diffraction method.
    Type: Application
    Filed: September 27, 2011
    Publication date: July 18, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshitaka Minamida, Chihiro Yada, Keiichi Kohama
  • Publication number: 20130093130
    Abstract: The present invention provides a method for producing a ceramic laminate capable of preventing coming-off of materials and warpage of the ceramic laminate by a heat treatment at a relatively-low temperature, and a ceramic laminate produced by the production method. Disclosed is a method for producing a ceramic laminate having a layer structure in which two or more layers are laminated, including: a step of producing a laminate including a first layer and a second layer, the first layer containing a solid electrolyte and the second layer containing at least composite particles obtained by covering an electrode active material with the solid electrolyte; and a step of performing a heat treatment on the laminate including the first and second layers at a temperature of 500° C. or more and less than 700° C.
    Type: Application
    Filed: July 1, 2010
    Publication date: April 18, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Chihiro Yada, Yoshitaka Minamida, Keiichi Kohama
  • Patent number: 8192868
    Abstract: A lithium ion battery before pre-doping includes: a negative electrode member before initial charge having a negative active material before initial charge; a positive electrode member; an electrolyte body; a battery case; and a lithium ion supply body formed by a lithium compound capable of emitting lithium ions when positive voltage is applied to it. The lithium ion supply body is arranged so that it is at least partially in contact with the inner exposed surface of the battery case. The negative electrode member before pre-doping is electrically insulated from the metal case member. The lithium ion supply body and the negative active material before initial charge are respectively in contact with the electrolyte body.
    Type: Grant
    Filed: February 1, 2008
    Date of Patent: June 5, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideyasu Kawai, Keiichi Kohama, Akira Tsujiko
  • Patent number: 7960057
    Abstract: A lithium-ion battery comprises a negative electrode, a positive electrode, and an electrolyte including a molten salt. The positive electrode comprises an electroactive compound including phosphorus, oxygen, lithium, and at least one other metal or semi-metal. The combination of such electrode compositions and a molten salt electrolyte provides a battery with very high thermal stability. Other ions, such as alkal metal ions, may be used in place of lithium ions for applications in other battery technologies.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: June 14, 2011
    Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., Toyota Motor Corporation, Centre National de la Recherche Scientifique, University de Montreal
    Inventors: Wen Li, Keiichi Kohama, Michel B. Armand, Gerald Perron
  • Publication number: 20100086843
    Abstract: A lithium ion battery before pre-doping includes: a negative electrode member before initial charge having a negative active material before initial charge; a positive electrode member; an electrolyte body; a battery case; and a lithium ion supply body formed by a lithium compound capable of emitting lithium ions when positive voltage is applied to it. The lithium ion supply body is arranged so that it is at least partially in contact with the inner exposed surface of the battery case. The negative electrode member before pre-doping is electrically insulated from the metal case member. The lithium ion supply body and the negative active material before initial charge are respectively in contact with the electrolyte body.
    Type: Application
    Filed: February 1, 2008
    Publication date: April 8, 2010
    Inventors: Hideyasu Kawai, Keiichi Kohama, Akira Tsujiko
  • Patent number: 7521153
    Abstract: A battery comprises a first electrode, a second electrode, an electrolyte, and an electron collector associated with the first electrode, the electron collector having a surface treatment, such as a protection layer, that reduces corrosion of the electron collector by the molten salt electrolyte.
    Type: Grant
    Filed: March 15, 2005
    Date of Patent: April 21, 2009
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Wen Li, Yutaka Oyama, Keiichi Kohama
  • Publication number: 20080020284
    Abstract: The present invention relates to polymeric binders of formula: [(—CH2CF2—)x?(—CF2CF2—)y?[—CH2CH(R)—]z?]m wherein: x?+y?+z?=1, only one x?, y? or z? could be simultaneously equal to zero; R is an alkyl radical CnH2n+1— with 0?n?8, 10?m?106.
    Type: Application
    Filed: April 30, 2004
    Publication date: January 24, 2008
    Applicants: UNIVERSITE DE MONTREAL, CENTRE NATIONAL DE LA RECHERCE SCIENTIFIQUE
    Inventors: Christophe Michot, Gerald Perron, Junzo Ukai, Wen Li, Keiichi Kohama, Yutaka Oyama, Shoji Yokoishi
  • Publication number: 20070003833
    Abstract: A lithium-ion battery comprises a negative electrode, a positive electrode, and an electrolyte including a molten salt. The positive electrode comprises an electroactive compound including phosphorus, oxygen, lithium, and at least one other metal or semi-metal. The combination of such electrode compositions and a molten salt electrolyte provides a battery with very high thermal stability. Other ions, such as alkal metal ions, may be used in place of lithium ions for applications in other battery technologies.
    Type: Application
    Filed: May 16, 2005
    Publication date: January 4, 2007
    Inventors: Wen Li, Keiichi Kohama, Michael Armand, Gerald Perron