Patents by Inventor Masaki Hirooka

Masaki Hirooka 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).

  • Alkaline battery separator and process for producing the same
    Patent number: 6607859
    Abstract: An alkaline battery separator which enables the preparation of a battery with a good yield and workability is provided. The alkaline battery separator of the present invention comprises a fiber sheet mainly comprising hydrophilicity-imparted polyolefin fibers having a fiber diameter of 8 &mgr;m or more, and a part of the hydrophilicity-imparted polyolefin fibers is composed of high-strength fibers having a tensile strength of 5 g/d or more.
    Type: Grant
    Filed: October 8, 2000
    Date of Patent: August 19, 2003
    Assignee: Japan Vilene Company, Ltd.
    Inventors: Masanao Tanaka, Masaki Hirooka, Toshiaki Takase
  • Alkaline battery separator and process for producing the same
    Patent number: 6348286
    Abstract: An alkaline battery separator comprising a fiber sheet containing, on outer surfaces of fibers forming a surface of the fiber sheet, a substance having a peak of a bond energy at 530.5 to 531.5 eV which is measured by an X-ray photoelectron spectrometer at a photoelectron-taking-off angle of about 30°; a fiber sheet containing a larger amount of carboxyl groups bonded to surfaces of fibers forming an inside of the fiber sheet than an amount of carboxyl groups bonded to outer surfaces of fibers forming a surface of the fiber sheet; or a fiber sheet capable of entrapping ammonia in an amount of 0.4 mmol/g or more in average is disclosed.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: February 19, 2002
    Assignee: Japan Vilene Co., Ltd.
    Inventors: Masanao Tanaka, Kazuya Sato, Koichi Kato, Yasuhiro Ito, Hiroaki Yamazaki, Masaki Hirooka, Yoshiaki Kawatsu
  • Battery separator and a battery
    Patent number: 5290645
    Abstract: A battery separator comprising a sheet material containing a polyvinyl alcohol cross-linked by a cross-linking group of the general formula (I): ##STR1## wherein A represents a group of --CH.dbd.CH--R.sub.1 or ##STR2## R.sub.1 represents an optionally substituted quaternary nitrogen-containing aromatic heterocyclic group, R.sub.2 and R.sub.3 independently represent a hydrogen atom or alkoxy group having 1 to 4 carbon atoms, m is o or 1, and n is an integer of 1 to 6, is disclosed.The separator exhibits a good resistance to electrolyte, electrolyte holding rate, and resistant to short-circuits.
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: March 1, 1994
    Assignee: Japan Vilene Co., Ltd.
    Inventors: Masanao Tanaka, Nobutoshi Tokutake, Yoshihiko Kondo, Hiroaki Yamazaki, Masaki Hirooka, Koji Kimura
  • Separator for an alkaline battery
    Patent number: 4699858
    Abstract: Disclosed is a separator formed of a non-woven fabric having a ratio of CONH/CH.sub.2 in the range of 1/9 to 1/12 for use in a battery. The seperator of the invention shows superior alkali/oxidation resistance with good electrolyte retainability resulting in a longer life battery.
    Type: Grant
    Filed: March 19, 1986
    Date of Patent: October 13, 1987
    Assignee: Firma Carl Freudenberg
    Inventors: Etsurou Nakao, Hiroaki Yamazaki, Masaki Hirooka
  • Alkaline battery separator and process for producing the same
    Patent number: RE41203
    Abstract: An alkaline battery separator which enables the preparation of a battery with a good yield and workability is provided. The alkaline battery separator of the present invention comprises a fiber sheet mainly comprising hydrophilicity-imparted polyolefin fibers having a fiber diameter of 8 ?m or more, and a part of the hydrophilicity-imparted polyolefin fibers is composed of high-strength fibers having a tensile strength of 5 g/d or more.
    Type: Grant
    Filed: February 8, 2000
    Date of Patent: April 6, 2010
    Assignee: Japan Vilene Company, Ltd.
    Inventors: Masanao Tanaka, Masaki Hirooka, Toshiaki Takase