Patents by Inventor Koki Yamashita

Koki Yamashita 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 for isolation of n-protected s-phenylcysteine
    Patent number: 6320072
    Abstract: This invention provides a method of isolating N-protected-S-phenylcysteine (1) of high purity, expediently, efficiently and in good yield, which comprises causing said N-protected-S-phenylcysteine to be salted out in the form of a base salt in the presence of water. wherein R1 represents an amino-protecting group; R2 represents a hydrogen atom or, either independently of R1 or taken together with R1, represents an amino-protecting group.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: November 20, 2001
    Assignee: Kaneka Corporation
    Inventors: Yasuyoshi Ueda, Hiroshi Murao, Koki Yamashita, Koichi Kinoshita