Patents by Inventor Osahiro Sato

Osahiro Sato 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
    Patent number: 5728863
    Abstract: Wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester with low water content can be obtained with high efficiency by solid-liquid separation of an aqueous suspension of .alpha.-L-aspartyl-L-phenylalanine methyl ester. The aqueous suspension is compressed at a final pressure of at least 20 kg/cm.sup.2 as a bearing pressure, and the wet crystals are dried after compression.
    Type: Grant
    Filed: February 15, 1996
    Date of Patent: March 17, 1998
    Assignee: Ajinomoto Company, Inc.
    Inventors: Takehiko Kataoka, Shinichi Kishimoto, Osahiro Sato
  • Method of preparing N-formyl-L-aspartic anhydride
    Patent number: 5623079
    Abstract: The present invention provides an industrial method of producing N-formyl-L-aspartic anhydride from N-formyl-L-aspartic acid, formic acid and acetic anhydride with less residual formic acid than conventional methods.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: April 22, 1997
    Assignee: Ajinomoto Co., Inc.
    Inventors: Takehiko Kataoka, Shinichi Kishimoto, Osahiro Sato