Patents by Inventor Tahiko Honjo

Tahiko Honjo 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 preparing 2-keto-L-gulonic acid
    Patent number: 3998697
    Abstract: 2-Keto-L-gulonic acid is prepared directly from D-glucose by microbial conversion utilizing mixed culturing on or mixed contacting with a medium containing D-glucose, employing at least two kind of microorganisms; 2,5-diketo-D-gluconic acid producing strains which belong to the genera of Acetobacter, Acetomonas and Gluconobacter and strains capable of converting the 2,5-diketo-D-gluconic acid into 2-keto-L-gulonic acid which belong to the general of Brevibacterium and Corynebacterium. Both the incubation of the microorganisms in a medium containing D-glucose and the direct contact of any products obtained from the cells of the microorganisms with the substrate may be used in the disclosed process.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: December 21, 1976
    Assignee: Shionogi & Co., Ltd.
    Inventors: Takayasu Sonoyama, Hiroyoshi Tani, Bunji Kageyama, Kobee Kobayashi, Tahiko Honjo, Shigeo Yagi
  • Process for producing 2-keto-L-gulonic acid
    Patent number: 3963574
    Abstract: 2-Keto-L-gulonic acid is prepared from 2,5-diketo-D-gluconic acid through microbial conversion. The 2-keto-L-gulonic acid producing microorganism available for this microbial conversion includes strains which belong to the species of the Brevibacterium nov. sp. ASM-856-4, ATCC 31083. The incubation of the microorganism in a medium containing 2,5-diketo-D-gluconic acid as well as the direct contact of any products obtained from the microbial cells with a substrate containing said 2,5-diketo-D-gluconic acid may be used in the disclosed process.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: June 15, 1976
    Inventors: Takayasu Sonoyama, Hiroyoshi Tani, Bunji Kageyama, Kobee Kobayashi, Tahiko Honjo, Shigeo Yagi
  • Process for producing 2-keto-L-gulonic acid
    Patent number: 3959076
    Abstract: 2-Keto-L-gulonic acid is prepared from 2,5-diketo-D-gluconic acid through microbial conversion. The 2-keto-L-gulonic acid producing microorganism available for this microbial conversion includes strains which belong to the genus Corynebacterium. The incubation of the microorganism in a medium containing 2,5-diketo-D-gliconic acid as well as the direct contact of any products obtained from the microbial cells with a substrate containing said 2,5-diketo-D-gluconic acid may be used in the disclosed process.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: May 25, 1976
    Assignee: Shionogi & Co., Ltd.
    Inventors: Takayasu Sonoyama, Hiroyoshi Tani, Bunji Kageyama, Kobee Kobayashi, Tahiko Honjo, Shigeo Yagi
  • Process for producing 2-keto-L-gulonic acid
    Patent number: RE30872
    Abstract: 2-Keto-L-gulonic acid is prepared from 2,5-diketo-D-gluconic acid through microbial conversion. The 2-keto-L-gulonic acid producing microorganism used for this microbial conversion includes strains which belong to genera of Brevibacterium, Arthrobacter, Micrococcus, Staphylococcus, Pseudomonas and Bacillus. Both the incubation of the microorganism in a medium containing 2,5-diketo-L-gluconic acid and the direct contact of any products obtained from the cells with a substrate containing said 2,5-diketo-D-gluconic acid may be used in the disclosed process.
    Type: Grant
    Filed: January 22, 1980
    Date of Patent: February 23, 1982
    Assignee: Shionogi & Co., Ltd.
    Inventors: Takayasu Sonoyama, Bunji Kageyama, Tahiko Honjo