Patents by Inventor Hideki Shimamoto

Hideki Shimamoto 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: 20020036884
    Abstract: An electric double layer capacitors, are disclosed, having improved stability of electrochemical properties and improved retention of residual voltage, imparted by using an electrolytic solution containing a polymer, such as acrylonitrile/ styrene copolymer, giving an increased electrolyte ion difusion resistance. The capacitors are useful for electro-storage devices, such as back-up power source for real time clocks.
    Type: Application
    Filed: June 19, 2001
    Publication date: March 28, 2002
    Inventors: Hideki Shimamoto, Yoshinori Takamuku, Yukiya Kobayashi, Minako Fujiyoshi
  • Patent number: 6315918
    Abstract: Non-aqueous electrolytic solutions for capacitors which release a little gas, have excellent potential window of electrochemical stability and enable capacitors to show excellent charging/discharging cycle properties and safety performance, and capacitors containing such non-aqueous electrolytic solutions. The non-aqueous electrolytic solution for capacitors comprises an electrolytic solution containing at least one cyclic carbonic ester selected from specified compounds and an electrolyte.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: November 13, 2001
    Assignees: Mitsui Chemicals Inc., Matsushita Electric Industrial Co., Ltd.
    Inventors: Satoko Mita, Tsuneaki Koike, Takeshi Ishitoku, Tatsuyoshi Ishida, Yoshinori Takamuku, Hideki Shimamoto
  • Patent number: 6185089
    Abstract: Non-aqueous electrolytic solutions for capacitor which release little gas and have excellent potential window of electrochemical stability, and which enable capacitors to have excellent charging/discharging cycle properties and safety performance, and capacitors containing such non-aqueous electrolytic solutions. Such non-aqueous electrolytic solutions for capacitors include an electrolyte selected from the group consisting of ammonium salts, phosphonium salts and amidine salts and a solvent for containing at least one phosphoric ester represented by the following formula (I): wherein, R1, R2 and R3, which may be the same or different, are an alkyl group, an unsaturated hydrocarbon group or an aryl group.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: February 6, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Satoko Mita, Tsuneaki Koike, Yoshinori Takamuku, Hideki Shimamoto
  • Patent number: 5457599
    Abstract: This invention relates to an electrolyte for use in electrolytic capacitors and also to an electrolytic capacitor using the electrolyte. The solute for the electrolyte is a quaternary ammonium salt of either a carboxylic acid selected from the group consisting of phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and maleic acid, or an alkyl or nitro-substituted compound of the acid. The electrolytic capacitor has improved low temperature characteristics and an improved variation in characteristics at high temperatures in relation to time with a prolonged life.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: October 10, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiteru Kuwae, Katsuji Shiono, Takaaki Kishi, Hideki Shimamoto, Hisao Nagara, Keiji Mori, Shingo Yoshida
  • Patent number: 5177673
    Abstract: An electrolyte for driving electrolytic capacitors and electrolytic capacitors using the electrolyte are described. The electrolyte comprises at least one quaternary ammonium salt of aliphatic saturated dicarboxylic acid having from 6 to 10 carbon atoms in total or a quaternary ammonium salt of glutaric acid, dissolved in a solvent comprised of an aliphatic polyol. When applied to an electrolytic capacitor, the electrolyte ensures improvements in loss characteristic and high temperature characteristics with time. Thus, the capacitor has a prolonged life.
    Type: Grant
    Filed: April 3, 1990
    Date of Patent: January 5, 1993
    Assignees: Matsushita Electric Industrial Co., Ltd., Sanyo Chemical Industries, Ltd.
    Inventors: Hisao Nagara, Hideki Shimamoto, Keiji Mori, Noriki Ushio, Katsuji Shiono, Takaaki Kishi
  • Patent number: 5055974
    Abstract: An electrolyte for use in electrolytic capacitors is provided. The electrolyte comprises a specified quaternary ammonium salt of a boric acid complex as a solute. A capacitor in which the electrolyte is used displays stable electrical characteristics at high temperatures as well as high sparking voltage and long life.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: October 8, 1991
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yukari Washio, Nobuhiro Takeishi, Hideki Shimamoto, Keiji Mori, Noriki Ushio, Katsuji Shiono, Takaaki Kishi, Hideo Samura
  • Patent number: 4821153
    Abstract: This invention relates to an electrolyte for use in electrolytic capacitors and also to an electrolytic capacitor using the electrolyte. The solute for the electrolyte is a quaternary ammonium salt of either a carboxylic acid selected from the group consisting of phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and maleic acid, or an alkyl or nitro-substituted compound of the acid. The electrolytic capacitor has improved low temperature characteristics and an improved variation in characteristics at high temperatures in relation to time with a prolonged life.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: April 11, 1989
    Assignees: Matsushita Electric Industrial Co., Ltd, Sanyo Chemical Industries, Ltd.
    Inventors: Yoshiteru Kuwae, Katsuji Shiono, Takaaki Kishi, Hideki Shimamoto, Hisao Nagara, Keiji Mori, Shingo Yoshida
  • Patent number: 4652968
    Abstract: Non-aqueous liquid electrolytes for electrolytic capacitors which comprise diazobicyclealkenes and/or salts thereof as a solute. The electrolytes are effective in improving low temperature and high temperature characteristics when applied as electrolytic capacitors. The capacitors using the electrolytes are also described.
    Type: Grant
    Filed: July 7, 1986
    Date of Patent: March 24, 1987
    Assignees: Matsushita Electric Industrial Co., Ltd., Sanyo Chemical Industries, Ltd.
    Inventors: Hideki Shimamoto, Yoshio Miyazaki, Yoichi Aoshima, Tsuyoshi Tsunetsugu, Hisao Nagara, Yoshiteru Kuwae, Kazushi Shiono