Patents by Inventor Tomoyuki Tada

Tomoyuki Tada 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: 20060217265
    Abstract: There is provided a catalyst for a fuel electrode of a solid polymer fuel cell, wherein the catalyst comprises fine precious metal particles loaded on a support composed of an electrically conductive material, and wherein the weight ratio of the fine precious metal particles and the support composed of an electrically conductive material (fine precious metal particles:electrically conductive material) is 60:40 to 95:5; and the fine precious metal particles satisfy the following conditions (a) to (c): (a) the fine precious metal particles contain platinum and ruthenium, and the mixing ratio thereof (platinum:ruthenium) is within a range between 1:1 and 1:3 in terms of molar ratio; (b) the fine precious metal particles have an average particle diameter of 3 to 10 nm; and (c) the fine precious metal particles contain oxygen, and the weight ratio of the fine precious metal particles and oxygen (fine precious metal particles:oxygen) is 86:14 to 96:4.
    Type: Application
    Filed: December 14, 2005
    Publication date: September 28, 2006
    Applicant: Tanaka Kikinzoku Kogyo K.K.
    Inventors: Tomoyuki Tada, Masahiko Inoue, Koichi Matsutani
  • Patent number: 7001865
    Abstract: The present invention is a catalyst for use in a fuel electrode of a polymer solid electrotype fuel cell which is formed by making a carbon powder support platinum and ruthenium thereon, and is characterized in that the loading ratio between platinum and ruthenium is from 1:2.5 to 1:4 (in molar ratio). It is preferable that the loading density of the catalyst is 40 to 70%. Additionally, it is preferable that a carbon powder having a specific surface area of 600 to 1,200 m2/g is used as the carrier supporting the catalyst particles.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: February 21, 2006
    Assignee: Tanaka Kikinzoku Kogyo K.K.
    Inventors: Tomoyuki Tada, Masahiko Inoue
  • Publication number: 20060019147
    Abstract: A solid polymer electrolyte fuel cell comprises: a plurality of electrode structures comprising an anode and a cathode, and polymer electrolyte membrane held between the anode and the cathode, and a plurality of separators for holding the respective electrode structures, with a fuel gas passage for supplying and discharging fuel gas containing hydrogen on a surface opposing the anode; and an oxidant gas passage for supplying and discharging oxidant gas on a surface opposing the cathode. The catalyst layer of the anode comprises a mixture of an ion conductive material, a platinum powder and/or platinum alloy powder and a carbon, the platium powder and/or platinum alloy powder and carbon substantially exist independently from each other, and the catalyst layer of the cathode comproses a metal support mixture in which the ion conductive material and the electro-conductive material having the supported catalyst material are mixed.
    Type: Application
    Filed: July 14, 2005
    Publication date: January 26, 2006
    Applicants: HONDA MOTOR CO., LTD., TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Kaoru Fukuda, Ryoichiro Takahashi, Junji Matsuo, Tomoyuki Tada, Masahiko Inoue, Koichi Matsutani
  • Patent number: 6847518
    Abstract: A membrane electrode assembly for a polymer electrolyte fuel cell has a polymer electrolyte membrane, an anode, and a cathode having a catalytic layer and a diffusion layer. The alloy catalyst contains ruthenium in the anode diffusion layer. The assembly has less loss of efficiency, particularly when operated at high potentials.
    Type: Grant
    Filed: December 2, 2003
    Date of Patent: January 25, 2005
    Assignees: Honda Motor Co., Ltd., Tanaka Kikinzoku Kogyo K.K.
    Inventors: Kaoru Fukuda, Masaki Tani, Hayato Kaji, Shigeru Inai, Takeshi Muro, Shinya Watanabe, Tomoyuki Tada, Masahiko Inoue
  • Publication number: 20040219420
    Abstract: The present invention is a catalyst for use in a fuel electrode of a polymer solid electrotype fuel cell which is formed by making a carbon powder support platinum and ruthenium thereon, and is characterized in that the loading ratio between platinum and ruthenium is from 1:2.5 to 1:4 (in molar ratio). It is preferable that the loading density of the catalyst is 40 to 70%. Additionally, it is preferable that a carbon powder having a specific surface area of 600 to 1,200 m2/g is used as the carrier supporting the catalyst particles.
    Type: Application
    Filed: January 28, 2004
    Publication date: November 4, 2004
    Inventors: Tomoyuki Tada, Masahiko Inoue
  • Publication number: 20040214058
    Abstract: The present invention provides a fuel electrode of a solid polymer electrolyte fuel cell for advancing a fuel cell reaction to oxidize the fuel introduced through a diffusion layer, comprising at least one reaction layer which is in contact with a solid polymer electrolyte membrane and advances the fuel cell reaction and at least one water decomposition layer which is in contact with the diffusion layer and electrolyzes the water in the fuel electrode. The layer taking charge of the fuel cell reaction is protected by providing the fuel electrode having a multilayer structure and providing the layer for preferentially performing the electrolysis of the water contained in the fuel or the like. This results in a fuel electrode in which the reduction of the electrode performance will not easily occur even when fuel shortage may be created.
    Type: Application
    Filed: June 19, 2003
    Publication date: October 28, 2004
    Applicants: Tanaka Kikinzoku Kogyo K.K., Honda Motor Co., Ltd.
    Inventors: Tomoyuki Tada, Masahiko Inoue
  • Publication number: 20040136143
    Abstract: A membrane electrode assembly for a polymer electrolyte fuel cell has a polymer electrolyte membrane, an anode, and a cathode having a catalytic layer and a diffusion layer. The alloy catalyst contains ruthenium in the anode diffusion layer. The assembly has less loss of efficiency, particularly when operated at high potentials.
    Type: Application
    Filed: December 2, 2003
    Publication date: July 15, 2004
    Inventors: Kaoru Fukuda, Masaki Tani, Hayato Kaji, Shigeru Inai, Takeshi Muro, Shinya Watanabe, Tomoyuki Tada, Masahiko Inoue
  • Patent number: 6678866
    Abstract: An advertising information memory area for storing advertising information for displaying prescribed advertisement, and a label information memory area for storing label information for presenting a space for displaying advertisement, are provided. A personal computer refers the label information memory area and the advertising information memory area, synthesizes advertisement images and character strings based on the advertising information, and displays the same in the label image based on the label information. An advertising environment is provided which is highly effective in a personal computer environment.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: January 13, 2004
    Assignees: Hakuhodo Inc., Tyo Productions Inc.
    Inventors: Hideo Sugimoto, Yukio Ishikawa, Masaki Mikami, Toshiya Fukuda, Tetsuya Uchida, Tomoko Koda, Masatoshi Akihara, Mari Okazaki, Shuji Kakimoto, Takayoshi Kishimoto, Masahiko Shima, Hideyuki Kanai, Tomoyuki Tada, Motokazu Sekine
  • Patent number: 6339038
    Abstract: A catalyst for a fuel cell containing polymer solid electrolyte, which catalyst contains platinum/ruthenium on a carrier in proportions of 2-4:8-6 on a mol basis and exhibits excellent resistance to catalyst poisoning attributed to carbon monoxide. In the present invention, there is disclosed a method for producing the catalyst, which-includes adding an alcohol to a mixture of an aqueous solution of a ruthenium compound and a platinum catalyst, reducing ruthenium, and causing ruthenium to precipitate at a reaction temperature between 60° C. and the boiling point of the mixture after addition of alcohol. A suitable alcohol may be ethanol or methanol in the concentration of 5-15 vol. % based on the total volume of the mixture, and a suitable heating temperature is in the vicinity of the boiling point of the mixture to which ethanol or methanol has been added.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: January 15, 2002
    Assignees: Tanaka Kikinzoku Kogyo K. K.
    Inventors: Tomoyuki Tada, Masahiko Inoue, Yumi Yamamoto
  • Patent number: 6246976
    Abstract: The present invention is directed to identifying a language represented by a character code and its character code system. An occurrence probability table describing for each character the probability that a character code occurs is prepared for each combination of a language and a character code system. An entered character code string is divided for each character, and the occurrence probability table is referred to, to obtain the probability that the character code occurs. The product of the occurrence probabilities is calculated for each combination of the language and the character code system, to judge the combination of the language and the character code system with respect to the entered character code string on the basis of the obtained product.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: June 12, 2001
    Assignee: Omron Corporation
    Inventors: Shinichi Mukaigawa, Toshihiro Fujinami, Hidenobu Kanaoka, Tomoyuki Tada
  • Patent number: 5871552
    Abstract: Disclosed is a process of preparing an electrode for a solid polymer electrolyte fuel cell which comprises applying a suspension liquid containing a catalyst and ion exchange resin or a catalyst, Ion exchange resin and hydrophobic resin to an electrode substrate, and forming a catalyst layer by drying, sintering the substrate under pressure characterized in that a high boiling point solvent which cannot be removed during the drying procedure is added to the suspension liquid. In this process, the high boiling point solvent such as glycerin and n-butanol which is not removed during the drying step is present in the pressurizing and sintering steps so that the situation of the catalyst layer is maintained constant scarcely influenced by the conditions of the said steps. The above solvent imparts pertinent softness to the ion exchange resin so as not to fill the pores for gas diffusion in the catalyst layer and to sufficiently bond the pieces of the ion exchange having the role of conducting H.sup.
    Type: Grant
    Filed: November 21, 1996
    Date of Patent: February 16, 1999
    Assignees: Tanaka Kikinzoku Kogyo K.K., Masahiro Watanabe, Stonehart Associates, Inc.
    Inventor: Tomoyuki Tada
  • Patent number: 5843519
    Abstract: Disclosed herein are four aspects of processes for preparing an electrode for a solid polymer electrolyte electrochemical cell such as a fuel cell. According to the processes, the electrode having a thin and uniform electrocatalyst layer can be obtained effectively and economically. The processes include a spraying method, a paste rolling method and a dry mixture method.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: December 1, 1998
    Assignees: Tanaka Kikinzoku Kogyo K.K., Masahiro Watanabe, Stonehart Associates Inc.
    Inventor: Tomoyuki Tada
  • Patent number: 5766788
    Abstract: Disclosed herein are electrode composition material for a polymer electrolyte fuel cell and a process of preparing same. The electrode composition material includes agglomerates composed of catalyst-loading particles coated with or not coated with ion exchange resin having two particle distribution peaks. The electrode composition material having the two particle distribution peaks supplements the drawbacks of excessively fine particles and of excessively coarse particles and can obtain the excellent cell performance.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: June 16, 1998
    Assignee: Tanaka Kikinzoku Kogyo K.K.
    Inventors: Masahiko Inoue, Tomoyuki Tada