Patents by Inventor Yuko Sasao

Yuko Sasao 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).

  • Process for producing L-tryptophan in serine auxotrophic microorganisms belonging to the genus corynebacterium or brevabacterium
    Patent number: 5624828
    Abstract: The present invention provides a process for producing substances such as L-tryptophan and L-threonine, which comprises transforming a serine-requiring microorganism belonging to the genus Corynebacterium or Brevibacterium by incorporation of a recombinant plasmid containing a gene which complements the serine-requirement of the host and a gene which relates to the biosynthesis of a desired substance; culturing the obtained transformant in a culture medium; allowing the substance produced by the transformant to accumulate in the culture; and recovering the substance from the culture.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: April 29, 1997
    Assignee: Kyowa Hakko Kogyo Co. Ltd.
    Inventors: Ryoichi Katsumata, Masato Ikeda, Keiko Nakanishi, Yuko Sasao
  • Process for stably maintaining recombinant plasmids in serine auxotrophic microorganisms belonging to the genus Corynebacterium or Brevibacterium
    Patent number: 5595894
    Abstract: The present invention provides a process for producing substances such as L-tryptophan and L-threonine, which comprises transforming a serine-requiring microorganism belonging to the genus Corynebacterium or Brevibacterium by incorporation of a recombinant plasmid containing a gene which complements the serine-requirement of the host and a gene which relates to the biosynthesis of a desired substance; culturing the obtained transformant in a culture medium; allowing the substance produced by the transformant to accumulate in the culture; and recovering the substance from the culture.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: January 21, 1997
    Assignee: Kyowa Hakko Kogyo Co. Ltd.
    Inventors: Ryoichi Katsumata, Masato Ikeda, Keiko Nakanishi, Yuko Sasao