Patents by Inventor Takeo Akashiba

Takeo Akashiba 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, and a pure culture of a microorganism strain used in said process
    Patent number: 4363875
    Abstract: In a process for producing L-tryptophan which comprises cultivating an L-tryptophan-producing mutant of Bacillus subtilis under aerobic conditions in a nutrient culture medium containing anthranilic acid, a carbon source, a nitrogen source and a mineral source, and recovering the resultant L-tryptophan from the culture broth, the improvement wherein the mutant is a strain resistant to 5-fluorotryptophan and 8-azaguanine; and a pure culture of a microorganism strain used in said process.
    Type: Grant
    Filed: June 9, 1981
    Date of Patent: December 14, 1982
    Assignee: Showa Denko K.K.
    Inventors: Takeo Akashiba, Akira Nakayama, Atsuhiko Murata