Patents by Inventor Youko Mitani

Youko Mitani 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).

  • Prolonged-release liquid type of pharmaceutical preparation comprising drug-resin complex and benzoate preservative
    Patent number: 5368852
    Abstract: The present invention provides a prolonged-release liquid type of pharmaceutical preparation prepared by coating a pharmaceutically active drug-ion exchange resin complex which was treated previously with an impregnating agent, with a water permeable diffusion barrier material, followed by suspending the coated complex in a solution containing preservatives. The formulation of the present invention does not develop the rupture of the diffusion barrier film even in a solution containing preservatives. Therefore the formulation of the present invention is a prolonged-release liquid type of pharmaceutical preparation which is stable and does not lose the controlled release of the active ingredient.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: November 29, 1994
    Assignee: Rohnto Pharmaceutical Co., Ltd.
    Inventors: Mitsuo Umemoto, Kiyotsugu Higashi, Youko Mitani
  • Pharmaceutical formulation in the form of aqueous suspension
    Patent number: 5334378
    Abstract: A pharmaceutical formulation in the form of aqueous suspension which comprises an ion exchange resin carrying an active ingredient and a suspending agent, characterized in that the formulation further contains a basic or neutral amino acid or a salt thereof as a dispersion stabilizer.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: August 2, 1994
    Assignee: Rohto Pharmaceutical Co., Ltd.
    Inventors: Youko Mitani, Kenji Muta, Mitsuo Umemoto