Patents by Inventor Susumi Hatakeyama

Susumi Hatakeyama 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).

  • 24-hydroxy vitamin D derivatives
    Patent number: 6538145
    Abstract: A process for preparing vitamin D derivatives having the following formula: wherein R1, R2, R3, and R4, which may be the same or different, represent a hydrogen atom or a protecting group, comprising: reacting a compound of formula (2)  wherein R1 represents a hydrogen atom or a protecting group, with a compound having the formula (3)  wherein R1 represents a hydrogen atom and R2, R3, and R4, which are the same or different, represent a hydrogen atom or a protecting group.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: March 25, 2003
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Susumi Hatakeyama, Hiroyoshi Watanabe, Akira Kawase
  • 24-hydroxy vitamin D derivatives
    Publication number: 20020094972
    Abstract: A process for preparing vitamin D derivatives having the following formula: 1
    Type: Application
    Filed: March 19, 2002
    Publication date: July 18, 2002
    Applicant: CHUGAI SEIYAKU KABUSHIKI KAISHA
    Inventors: Susumi Hatakeyama, Hiroyoshi Watanabe, Akira Kawase