Patents by Inventor Takako Sasano

Takako Sasano 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).

  • Gel-form solid polymer electrolyte
    Patent number: 6296783
    Abstract: A polymeric gel electrolyte comprising: (a) an acrylic ester polymer matrix containing structural units derived from at least one acrylic ester selected from among acrylic esters represented by the general formulae: (wherein, in the formula (I), R1, R2 and R2′ are identical with or different from each other and represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R3 represents an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 100; and, in the formula (II), R4 to R9 are identical with or different from each other and represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and p, q and r are identical with or different from each other and are an integer of 1 to 100); (b) a nonaqueous solvent of a carbonic ester; and (c) a salt of a metal of Group Ia of the periodic table.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: October 2, 2001
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Masaharu Shindo, Takako Sasano
  • Fluorine-substituted cyclic carbonate electrolytic solution and battery containing the same
    Patent number: 6010806
    Abstract: Monofluoromethyl ethylene carbonate, difluoromethyl ethylene carbonate and trifluoromethyl ethylene carbonate are provided as novel compounds. These compounds are very useful as solvents because they are chemically and physically stable, have a high dielectric constant, can dissolve well organic substances and have a wide application temperature range. These compounds are excellent in charge and discharge cycle characteristics, have a high flash point, and are safe as non-aqueous elecytrolytes and hence, batteries using these compounds are excellent in withstand voltage and charge and discharge cycle characteristics.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: January 4, 2000
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Keiichi Yokoyama, Takako Sasano, Akio Hiwara
  • Acrylic ester, novel allyl ether, novel allyl carbonate, acrylic ester polymer, allyl ether polymer, allyl carbonate polymer and polymeric solid electrolyte
    Patent number: 5977277
    Abstract: The novel acrylic ester, allyl ether and allyl carbonate of the present invention are characterized by having the structures represented by the following general formulae (I) to (IV): The above acrylic ester, allyl ether and allyl carbonate are used as a starting monomer which forms a polymer matrix for use in a polymeric solid electrolyte. The novel polymer of the present invention comprises structural units derived from at least one compound selected from a group of the compounds represented by the above general formulae (I) to (IV). The polymeric solid electrolyte comprising the above novel polymer as a polymer matrix exhibits high ionic conductivity and is chemically stable.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: November 2, 1999
    Assignee: Mitsui Petrochemical Industries, Ltd
    Inventors: Keiichi Yokoyama, Takako Sasano, Akio Hiwara, Masahiro Toriida, Satoko Mita, Masayoshi Watanabe