Patents by Inventor Seizo Oishi

Seizo Oishi 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).

  • Chitosan-containing acrylic fibers and process for preparing the same
    Patent number: 6551705
    Abstract: The present invention is directed to chitosan-containing acrylic fibers having a total chitosan content of 0.05 to 2% by weight and an extractable chitosan content of not less than 0.03% by weight to less than the total chitosan content. The antimicrobial activity of the chitosan-containing acrylic fibers of the present invention can persist for a long period of time and is not deteriorated even when subjected to posttreatments, such as dyeing and bleaching of fibers, and treatments in usual service environments of fiber products, such as washing and ironing.
    Type: Grant
    Filed: March 17, 1999
    Date of Patent: April 22, 2003
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hiroaki Ohnishi, Yoshihiro Nishihara, Hiroshi Hosokawa, Seizo Oishi, Masako Iwamoto, Yasuyuki Fujii, Hajime Itoh, Naoto Ohsuga, Gary J. Capone, Charles W. Emerson
  • Process of making chitosan-containing acrylic fibers
    Patent number: 6524508
    Abstract: The present invention is directed to chitosan-containing acrylic fibers having a total chitosan content of 0.05 to 2% by weight and an extractable chitosan content of not less than 0.03% by weight to less than the total chitosan content. The antimicrobial activity of the chitosan-containing acrylic fibers of the present invention can persist for a long period of time and is not deteriorated even when subjected to posttreatments, such as dyeing and bleaching of fibers, and treatments in usual service environments of fiber products, such as washing and ironing.
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: February 25, 2003
    Assignees: Mitsubishi Rayon Co., Ltd., Solutia Inc.
    Inventors: Hiroaki Ohnishi, Yoshihiro Nishihara, Hiroshi Hosokawa, Seizo Oishi, Masako Iwamoto, Yasuyuki Fujii, Hajime Itoh, Naoto Ohsuga, Gary J. Capone, Charles W. Emerson
  • Flat filaments provided with ribs and raw fibers for pile fabrics
    Patent number: 5853853
    Abstract: Flat filaments have a flatness (A/B) of 7 to 25, where A is a length of at least one of the two longer sides of a substantially rectangular, transverse cross-section of each filament and B is a length of at least one of the two shorter sides of the substantially rectangular, transverse cross-section of each filament. The flat filaments also have a fineness of 0.5 to 40 denier, and are provided on each of the two longer sides with one or more ribs continuously extending in a direction of an axis of the filament and having a width W and a height H. The number of the ribs on each longer side ranges from 1 to A/2W, the rib width W ranges from B/2 to 3B, and the rib height H ranges from B/2 to 2B. The filaments have excellent nontackiness and bulkiness and permit easy elimination of crimps by polishing, and can be suitably used as raw fibers which, when formed into a pile product, provide the pile product not only with a soft feeling but also with resilient and substantial feeling.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: December 29, 1998
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yoshihiro Nishihara, Hideo Masaoka, Fumio Takemoto, Seizo Oishi, Hiroshi Hosokawa