Patents by Inventor Yasumi Koganei

Yasumi Koganei 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).

  • Wound dressing
    Patent number: 4997425
    Abstract: A wound dressing having a porous layer with a good affinity to tissue of organisms comprising (a) a first layer to be placed on the wound surface having pores of 20 to 500 .mu.m in diameter, and 1 to 10 mm thick, and (b) a second layer remote from the wound surface having pores not more than 20 .mu.m in diameter, and 0.5 to 5 .mu.m thick. The first layer can be provided with an antimicrobial of not more than 50% by weight, and the second layer can contain an antimicrobial of 10 to 80% by weight.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: March 5, 1991
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Nobuyuki Shioya, Yoshimitsu Kuroyanagi, Yasumi Koganei, Ryuichiro Yoda