Patents by Inventor Hidehiko Ohara

Hidehiko Ohara 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).

  • Lithium secondary cells and methods for preparing active materials for negative electrodes
    Patent number: 6106977
    Abstract: A lithium secondary cell wherein a carbon material treated with a fluorinating agent and having substantially no C--F covalent bond, is used as an active material for negative electrode, provides a secondary cell having improved cell life. Further, a lithium secondary cell wherein a carbon material treated with a fluorinating agent and having an amount of fluorine extractable with an aqueous alkaline solution being at most 0.05 wt %, is used as an active material for negative electrode, or a lithium secondary cell wherein a carbon material treated with a fluorinating agent and containing lithium, is used as an active material for negative electrode, provides a secondary cell which is free from a problem of expansion of the casing during charging due to fluorine remaining in a small amount in the cell.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: August 22, 2000
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yuukichi Kobayashi, Hidehiko Ohara, Kenji Watanabe, Kazuo Niwa
  • Lithium secondary cells and methods for preparing active materials for negative electrodes
    Patent number: 5871864
    Abstract: A lithium secondary cell wherein a carbon material treated with a fluorinating agent and having substantially no C-F covalent bond, is used as an active material for negative electrode, provides a secondary cell having improved cell life. Further, a lithium secondary cell wherein a carbon material treated with a fluorinating agent and having an amount of fluorine extractable with an aqueous alkaline solution being at most 0.05 wt %, is used as an active material for negative electrode, or a lithium secondary cell wherein a carbon material treated with a fluorinating agent and containing lithium, is used as an active material for negative electrode, provides a secondary cell which is free from a problem of expansion of the casing during charging due to fluorine remaining in a small amount in the cell.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: February 16, 1999
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yuukichi Kobayashi, Hidehiko Ohara, Kenji Watanabe, Kazuo Niwa
  • Surface-modified molded product of synthetic resin and process for producing it
    Patent number: 5626910
    Abstract: A process for producing a surface-modified molded product of synthetic resin, which comprises contacting a fluorine-containing gas to the surface of a molded product of synthetic resin and then contacting a polymerizable monomer to form a new polymer layer on the surface of the molded product.
    Type: Grant
    Filed: January 27, 1995
    Date of Patent: May 6, 1997
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yasuo Tanabe, Koshi Sasaki, Hidehiko Ohara, Naoshi Imaki
  • Fluorine-containing polyolefin non-woven fabric and method of manufacturing the same
    Patent number: 5484651
    Abstract: A fluorine-containing, polyolefin fiber non-woven fabric having enhanced resistance to degradation when exposed to a potassium hydride solution is produced by exposing a polyolefin fiber non-woven fabric to a gaseous atmosphere comprising F.sub.2 and O.sub.2 gases in certain volumetric ratios.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: January 16, 1996
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Koshi Sasaki, Hidehiko Ohara, Naoshi Imaki