Patents by Inventor Shinichi Nakatsugawa

Shinichi Nakatsugawa 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).

  • Anhydrous crystal of 4-carbamoyl-1-.beta.-D-ribofuranosyl imidazolium-5-oleate
    Patent number: 5442051
    Abstract: Anhydrous crystals of 4-carbamoyl-1-.beta.-D-ribofuranosyl imidazolium-5-olate are disclosed. The crystals possess (1) water content of 0.5% by weight or less (the Karl Fisher method), and (2) specific IR spectrum absorption peaks in the neighborhoods of 3580, 1852, 1630, 1575, and 1554 cm.sup.-1. They are stable against heat and high humidity conditions and can easily be manufactured by using ethanol. The compound has superior immuno-suppressing activity and is thus made into preparations for oral administration.
    Type: Grant
    Filed: April 21, 1994
    Date of Patent: August 15, 1995
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Shinji Ozeki, Shinichi Nakatsugawa