Patents by Inventor Osamu Johdo

Osamu Johdo 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).

  • Crystalline anthracycline antibiotic and process for producing the same
    Patent number: 6747012
    Abstract: Disclosed are a crystalline form of anthracycline antibiotic having specific characteristic 2&thgr; values as measured by the X-ray diffraction method, and a process for producing the crystalline form. This process comprises the step of crystallization involving the combined use of a specific poor solvent for the antibiotic and a good solvent thereof. This crystalline form has excellent chemical and physical properties.
    Type: Grant
    Filed: June 1, 2000
    Date of Patent: June 8, 2004
    Assignee: Mercian Corporation
    Inventors: Osamu Johdo, Kiyotomo Nakamura, Takeo Yoshioka
  • Crystallization of doxorubicin hydrochloride
    Patent number: 6653455
    Abstract: Disclosed are a crystallizing method of doxorubicin hydrochloride from a doxorubicin hydrochloride-containing solution, particularly a method for carrying out the crystallization under a condition of 40° C. or higher, and a doxorubicin hydrochloride crystalline aggregate having particularly an excellent solubility in water.
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: November 25, 2003
    Assignee: Mercian Corporation
    Inventors: Osamu Johdo, Takuma Nakao, Takeo Yoshioka
  • Method of purifying daunomycin
    Patent number: 6388058
    Abstract: The present invention relates to a method in which daunomycin is eluted from a hydrophobic porous synthetic resin carrier onto which daunomycin is adsorbed from crude daunomycin with a buffered aqueous solution containing a water-miscible organic solvent to recover purified daunomycin. Daunomycin (daunorubicin) is purified efficiently.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: May 14, 2002
    Assignee: Mercian Corporation
    Inventors: Osamu Johdo, Konomi Iguchi, Takeo Yoshioka