Patents by Inventor Tomozo Yamada

Tomozo Yamada 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).

  • Method of preparing fine crystal particles of maleic anhydride
    Patent number: 4709057
    Abstract: A method of preparing fine crystal particles of maleic anhydride is provided. The method contains the steps of putting a molten mass of maleic anhydride into a hermetically closed container moved at a moving rate of 1 to 30 times per minute and cooling the molten mass to room temperature over three hours or more. A maleic anhydride composition contains 0.01 to 5 wt. parts of colloidal silica relative to 100 wt. parts of maleic anhydride particles.
    Type: Grant
    Filed: September 3, 1986
    Date of Patent: November 24, 1987
    Assignee: Nippon Oil and Fats Co., Ltd.
    Inventors: JPX, Seizi Sumida, Kaichi Ono, Kazuo Yoshida, Tomozo Yamada