Patents by Inventor Hisako Sawa

Hisako Sawa 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).

  • Method for stabilizing pranoprofen and stable liquid preparation of pranaprofen
    Patent number: 5889030
    Abstract: A method for stabilizing pranoprofen, comprising placing an aqueous solution of pranoprofen in coexistence with an antioxidant, or placing an aqueous solution of pranoprofen under the conditions of limited supply of oxygen, and a stable aqueous preparation of pranoprofen, comprising pranoprofen and an antioxidant. According to the present invention, the decomposition of pranoprofen in an aqueous solution of pranoprofen is remarkably suppressed. In particular, pranoprofen becomes stable to light, thus permitting long-term preservation of an aqueous solution, specifically a liquid preparation, of pranoprofen.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: March 30, 1999
    Assignees: Senju Pharmaceutical Co., Ltd., Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Koji Doi, Hisako Sawa, Yoshie Ozaki, Yoshiyuki Kimura
  • Method for stabilizing pranoprofen and stable liquid preparation of pranoprofen
    Patent number: 5856345
    Abstract: A method for stabilizing pranoprofen, comprising placing an aqueous solution of pranoprofen in coexistence with an antioxidant, or placing an aqueous solution of pranoprofen under the conditions of limited supply of oxygen, and a stable aqueous preparation of pranoprofen, comprising pranoprofen and an antioxidant. According to the present invention, the decomposition of pranoprofen in an aqueous solution of pranoprofen is remarkably suppressed. In particular, pranoprofen becomes stable to light, thus permitting long-term preservation of an aqueous solution, specifically a liquid preparation, of pranoprofen.
    Type: Grant
    Filed: January 7, 1997
    Date of Patent: January 5, 1999
    Assignees: Senju Pharmaceutical Co., Ltd., Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Koji Doi, Hisako Sawa, Yoshie Ozaki, Yoshiyuki Kimura