Patents by Inventor Atsumu Ohga

Atsumu Ohga 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).

  • Narrow-cross sectioned fibers for use in tobacco smoker filters
    Patent number: 4724849
    Abstract: Fibers of narrow cross section for use in tobacco filters composed of cellulose acetate fibers in which the fiber cross section is in a rectangular configuration and the longer/shorter diameter ratio thereof is greater than 5.5.Filters of high filtering performance can be manufactured with a relatively small fiber filling rate.
    Type: Grant
    Filed: September 16, 1986
    Date of Patent: February 16, 1988
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Junji Kawamoto, Atsumu Ohga, Makoto Shiga, Masaharu Takegawa