Patents by Inventor Johnson Chung

Johnson Chung 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).

  • Mutant strain with increased maytansinoid production
    Patent number: 7192750
    Abstract: A microorganism that is a mutant bacterial strain of the species Actinosynnema pretiosum, designated PF4-4, (ATCC PTA-3921), being capable of producing maytansinoid ansamitocins such as ansamitocin P-3 in improved yield compared to previous known strains, and capable of growth under varied culture conditions, and methods of producing maytansinoid ansamitocins by culturing PF4-4 in a suitable growth medium.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: March 20, 2007
    Assignees: Immunogen Inc., Genentech, Inc.
    Inventors: Johnson Chung, Graham S. Byng
  • Mutant actinosynnema pretiosum strain with increased maytansinoid production
    Publication number: 20050003513
    Abstract: A microorganism that is a mutant bacterial strain of the species Actinosynnema pretiosum, designated PF4-4, (ATCC PTA-3921), being capable of producing maytansinoid ansamitocins such as ansamitocin P-3 in improved yield compared to previous known strains, and capable of growth under varied culture conditions, and methods of producing maytansinoid ansamitocins by culturing PF4-4 in a suitable growth medium.
    Type: Application
    Filed: July 26, 2004
    Publication date: January 6, 2005
    Inventors: Johnson Chung, Graham Byng
  • Mutant Actinosynnema pretiosum strain with increased maytansinoid production
    Patent number: 6790954
    Abstract: A microorganism that is a mutant bacterial strain of the species Actinosynnema pretiosum, designated PF4-4, (ATCC PTA-3921), being capable of producing maytansinoid ansamitocins such as ansamitocin P-3 in improved yield compared to previous known strains, and capable of growth under varied culture conditions, and methods of producing maytansinoid ansamitocins by culturing PF4-4 in a suitable growth medium.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: September 14, 2004
    Assignees: Immunogen, Inc., Genentech, Inc.
    Inventors: Johnson Chung, Graham S. Byng
  • Mutant actinosynnema pretiosum strain with increased maytansinoid production
    Publication number: 20030157694
    Abstract: A microorganism that is a mutant bacterial strain of the species Actinosynnema pretiosum, designated PF4-4, (ATCC PTA-3921), being capable of producing maytansinoid ansamitocins such as ansamitocin P-3 in improved yield compared to previous known strains, and capable of growth under varied culture conditions, and methods of producing maytansinoid ansamitocins by culturing PF4-4 in a suitable growth medium.
    Type: Application
    Filed: January 29, 2002
    Publication date: August 21, 2003
    Applicant: IMMUNOGEN INC.
    Inventors: Johnson Chung, Graham S. Byng