Patents by Inventor Yoshiaki Kawatsu

Yoshiaki Kawatsu 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: 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
  • Filter material
    Patent number: 5738788
    Abstract: A filter material comprising a base material carrying thereon polyvinyl alcohols formed by cross-linking photosensitive polyvinyl alcohols having a quaternized nitrogen-containing aromatic heterocyclic group is disclosed.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: April 14, 1998
    Assignee: Japan Vilene Company Ltd.
    Inventors: Takashi Tokiwa, Etsuroh Nakao, Yoshiaki Kawatsu