Patents by Inventor Shiyunichiro Oga

Shiyunichiro Oga 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 comenic acid
    Patent number: 4221723
    Abstract: Preparing comenic acid by heating 2,5-diketo-gluconic acid at a temperature within the range of 8.degree.-120.degree. C. and at a pH below 0.1. .alpha.-pyrone derivatives are formed as by-products, and comenic acid is separated therefrom by utilizing the solubility differences between the .alpha.-pyrone derivatives and comenic acid.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: September 9, 1980
    Assignee: Daiichi Seiyaku Company, Ltd.
    Inventors: Shiyunichiro Oga, Kazuo Asano, Katsumi Imada