Patents by Inventor Katsuo Umehara

Katsuo Umehara 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).

  • Process for preparing oil sorbent and device for continuously preparing the same
    Patent number: 5585319
    Abstract: A process for preparing an oil sorbent excellent in oil sorptivity and water repellency and a device preparing the same are disclosed. The process for preparing an oil sorbent comprises mechanically fibrillating, or shredding and grinding lignocellulose material while substantially maintaining cell structure; and heating the resultant at a temperature of 250 to 450.degree. C. or 350 to 400.degree. C. for a predetermined period of time; followed by predetermined cooling to form an oil sorbent. The device for continuously preparing an oil sorbent having such a basic structure that three pipes with a "ellipse-shaped" cross-section each of which includes therein a screw type transferring means are arranged on top of one another, and the heating and the cooling are effected externally.
    Type: Grant
    Filed: February 8, 1994
    Date of Patent: December 17, 1996
    Assignee: Hokkaido
    Inventors: Masaru Saitoh, Katsuo Umehara, Nobuya Minemura, Fumito Nakamura, Yukihiro Kato, Hiromu Endoh