Patents by Inventor Yasuhiro Shiota

Yasuhiro Shiota 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).

  • Cellulose acetate hemodialysis membrane
    Patent number: 5783124
    Abstract: A cellulose acetate membrane composed of a mixture comprising a cellulose triacetate and a cellulose diacetate and having an improved heat stability, which does not substantially show a melting peak of cellulose diacetate but substantially shows a melting peak of cellulose triacetate, in a differential thermal analysis. By mixing a cellulose triacetate and a cellulose diacetate at an appropriate ratio, crystallization or orientational crystallization of each component due to a high pressure stream sterilization can be avoided and a cellulose acetate membrane with improved water permeability and sieving coefficient of myoglobin after a high pressure steam sterilization can be obtained.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: July 21, 1998
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Tohru Uenishi, Isamu Yamamoto, Kazutake Okamoto, Hideo Sato, Yasuhiro Shiota, Hidehiko Sakurai, Seiji Watanuki, Mitsuru Suzuki
  • Cellulose acetate hemodialysis membrane
    Patent number: 5624561
    Abstract: A cellulose acetate membrane composed of a mixture comprising a cellulose triacetate and a cellulose diacetate and having an improved heat stability, which does not substantially show a melting peak of cellulose diacetate but substantially shows a melting peak of cellulose triacetate, in a differential thermal analysis. By mixing a cellulose triacetate and a cellulose diacetate at an appropriate ratio, crystallization or orientational crystallization of each component due to a high pressure steam sterilization can be avoided and a cellulose acetate membrane with improved water permeability and sieving coefficient of myoglobin after a high pressure steam sterilization can be obtained.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: April 29, 1997
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Tohru Uenishi, Isamu Yamamoto, Kazutake Okamoto, Hideo Sato, Yasuhiro Shiota, Hidehiko Sakurai, Seiji Watanuki, Mitsuru Suzuki