Patents by Inventor Shigeko Yokoyama

Shigeko Yokoyama 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).

  • Guanidine compound and asymmetric reaction using the same
    Patent number: 7781425
    Abstract: A guanidine compound having a biaryl skeleton represented by the following formula (1), which is useful as a catalyst for various asymmetric reactions.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: August 24, 2010
    Assignee: Takasago International Coporation
    Inventors: Masahiro Terada, Hitoshi Ube, Shigeko Yokoyama, Hideo Shimizu
  • Guanidine Compound and Asymmetric Reaction Using the Same
    Publication number: 20080154036
    Abstract: A guanidine compound having a biaryl skeleton represented by the following formula (1), which is useful as a catalyst for various asymmetric reactions.
    Type: Application
    Filed: February 9, 2005
    Publication date: June 26, 2008
    Inventors: Masahiro Terada, Hitoshi Ube, Shigeko Yokoyama, Hideo Shimizu