Patents by Inventor Katsuhiko Fukai

Katsuhiko Fukai 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).

  • Immunoassay method to prevent inhibition of antigen-antibody binding interactions in mucosal fluids
    Patent number: 11719695
    Abstract: The purpose of the present invention is to: provide an agent that effectively suppresses inhibition of antigen-antibody reaction in an immunoassay using a sample containing a body fluid, in particular, a component derived from a biological mucosal membrane, such as saliva; and to suppress false positive and false negative results in the immunoassay. The present invention provides an agent for suppressing inhibition of immune reaction, characterized in that the agent comprises a compound of the following (1) or (2): (1) Sulfonic acid compound of the formula R1—SO3H or a salt thereof. (In the formula, R1 is selected from the group consisting of: a straight-chain C5-C30 alkyl group; a straight-chain C1-C30 alkyl group substituted with an aryl group having at least one straight-chain C5-C30 alkyl group; and an aryl group having at least one straight-chain C5-C30 alkyl group. These groups may include a substituent group); and (2) Quaternary ammonium ion of the formula N+—R2R3R4R5 or a salt thereof.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: August 8, 2023
    Assignees: NH Foods Ltd, National Agriculture and Food Research Organization
    Inventors: Eri Takeuchi, Kana Urayama, Takashi Matsumoto, Kazuki Morioka, Makoto Yamakawa, Kazuo Yoshida, Toru Kanno, Katsuhiko Fukai
  • SUBSTANCE THAT PREVENTS ANTIGEN-ANTIBODY REACTION INHIBITION BY BODY FLUID
    Publication number: 20200166436
    Abstract: The purpose of the present invention is to: provide an agent that effectively suppresses inhibition of antigen-antibody reaction in an immunoassay using a sample containing a body fluid, in particular, a component derived from a biological mucosal membrane, such as saliva; and to suppress false positive and false negative results in the immunoassay. The present invention provides an agent for suppressing inhibition of immune reaction, characterized in that the agent comprises a compound of the following (1) or (2): (1) Sulfonic acid compound of the formula R1—SO3H or a salt thereof. (In the formula, R1 is selected from the group consisting of: a straight-chain C5-C30 alkyl group; a straight-chain C1-C30 alkyl group substituted with an aryl group having at least one straight-chain C5-C30 alkyl group; and an aryl group having at least one straight-chain C5-C30 alkyl group. These groups may include a substituent group.); and (2) Quaternary ammonium ion of the formula N+—R2R3R4R5 or a salt thereof.
    Type: Application
    Filed: March 27, 2018
    Publication date: May 28, 2020
    Inventors: Eri Takeuchi, Kana Urayama, Takashi Matsumoto, Kazuki Morioka, Makoto Yamakawa, Kazuo Yoshida, Toru Kanno, Katsuhiko Fukai