Patents by Inventor Zhen Ya Zhang

Zhen Ya Zhang 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).

  • Method for producing vitamin B12 from hydrogen-metabolizing methane bacterium
    Patent number: 7018815
    Abstract: Mesophilic methane bacteria obtained from digested sludge are acclimatized in an H2/CO2 medium and the acclimatized methane bacteria are grown on a support inclusive of inorganic nutritional salts of trace metal elements by using an immobilized bed bioreactor. The grown bacteria are allowed to metabolize a mixed gas, prepared by adding hydrogen to at least one of coal gas and biogas, into methane and at the same time, cobalamin contained in the fermented liquor is recovered as an extracellular product in the form of cyanocobalamin by using potassium cyanide to thereby produce vitamin B12 efficiently in a high content and high yield.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: March 28, 2006
    Assignee: Japan Science and Technology Corporation
    Inventors: Takaaki Maekawa, Zhen Ya Zhang
  • Process for producing vitamin Bfrom hydrogen-metabolizing methane bacterium
    Patent number: 6972188
    Abstract: Mesophilic methane bacteria obtained from digested sludge are acclimatized in an H2/CO2 medium and the acclimatized methane bacteria are grown on a support inclusive of inorganic nutritional salts of trace metal elements by using an immobilized bed bioreactor. The grown bacteria are allowed to metabolize a mixed gas, prepared by adding hydrogen to at least one of coal gas and biogas, into methane and at the same time, cobalamin contained in the fermented liquor is recovered as an extracellular product in the form of cyanocobalamin by using potassium cyanide to thereby produce vitamin B12 efficiently in a high content and high yield.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: December 6, 2005
    Assignee: Japan Science and Technology Corporation
    Inventors: Takaaki Maekawa, Zhen Ya Zhang
  • Process for producing vitamim b12 from hydrogen-metabolizing methane bacterium
    Publication number: 20030134822
    Abstract: Mesophilic methane bacteria obtained from digested sludge are acclimatized in an H2/CO2 medium and the acclimatized methane bacteria are grown on a support inclusive of inorganic nutritional salts of trace metal elements by using an immobilized bed bioreactor. The grown bacteria are allowed to metabolize a mixed gas, prepared by adding hydrogen to at least one of coal gas and biogas, into methane and at the same time, cobalamin contained in the fermented liquor is recovered as an extracellular product in the form of cyanocobalamin by using potassium cyanide to thereby produce vitamin B12 efficiently in a high content and high yield.
    Type: Application
    Filed: November 25, 2002
    Publication date: July 17, 2003
    Inventors: Takaaki Maekawa, Zhen Ya Zhang