Patents by Inventor Hiyotaka Oyama

Hiyotaka Oyama 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 producing alpha-L-aspartyl-L-phenylalanine methyl ester having an improved solubility
    Patent number: 4831180
    Abstract: A process for producing dry .alpha.-L-aspartyl-L-phenylalanine methyl ester having an improved solubility by drying wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester, characterized in that the wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester are granulated so that the specific surface area during the drying operation is at least 4 m.sup.2 /g, followed by drying.
    Type: Grant
    Filed: August 11, 1987
    Date of Patent: May 16, 1989
    Assignee: Toyo Soda Manufacturing Company, Ltd.
    Inventors: Hidetoshi Wakamatsu, Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Hiyotaka Oyama