Patents by Inventor Tatsuo Yasuda

Tatsuo Yasuda 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).

  • Sustained release pharmaceutical compositions
    Patent number: 6919372
    Abstract: The present invention relates to sustained-release pharmaceutical compositions for ionic pharmaceutically active substances containing ionic compounds having opposite charges to those of ionic prostanoic acid derivatives and increasing hydrophobicity of the active substances. More specifically, the invention relates to sustained-release pharmaceutical compositions comprising the ionic prostanoic acid derivatives and the ionic compounds having opposite charges to those of the prostanoic acid derivatives and increasing hydrophobicity of these derivatives that contain hydrophobic groups in the molecule thereof. The pharmaceutical composition of the invention can exhibit excellent sustained release effect of the ionic prostanoic acid derivatives, irrespective of water solubility possessed by the ionic prostanoic acid derivatives.
    Type: Grant
    Filed: December 25, 1998
    Date of Patent: July 19, 2005
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Noboru Yamashita, Akira Takagi, Masataka Katsuma, Katsumi Saito, Yuuki Takaishi, Tatsuo Yasuda, Yutaka Takahashi, Mitsuo Mitomi, Michio Hara
  • Sustained release medicinal compositions
    Patent number: 6328979
    Abstract: The present invention relates to sustained-release pharmaceutical compositions for ionic pharmaceutically active substances (excluding ionic prostanoic acid derivatives) containing ionic compounds having opposite charges to those of the active substances and increasing hydrophobicity of the active substances. More specifically, the invention relates to sustained-release pharmaceutical compositions comprising the ionic pharmaceutically active substances and the ionic compounds having opposite charges to those of the active substances and increasing hydrophobicity of the active substances that contain hydrophobic groups in the molecule thereof. The pharmaceutical composition of the invention can exhibit excellent sustained release effect of the active substance, irrespective of water solubility possessed by the ionic pharmaceutically active substances.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: December 11, 2001
    Assignee: Yamanouchi Pharmaceuticals, Co. Ltd.
    Inventors: Noboru Yamashita, Akira Takagi, Masataka Katsuma, Katsumi Saito, Yuuki Takaishi, Tatsuo Yasuda, Yutaka Takahashi, Mitsuo Mitomi