Patents by Inventor Yosuke Ohkura

Yosuke Ohkura 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).

  • Quinoxalinone derivatives and analytical method using said compounds
    Patent number: 4800223
    Abstract: A quinoxalinone derivative of the following formula: ##STR1## where R.sub.1 and R.sub.2 are each methyl, ethyl or propyl; and R.sub.3 is a chlorine atom or azide, is a reagent capable of high-sensitivity labelling for fluorescence that reacts quantitatively with each of primary, secondary and tertiary hydroxyl groups to provide for easy labelling for fluorescence and which allows quantitative analyzing over a wide detection range.
    Type: Grant
    Filed: March 11, 1987
    Date of Patent: January 24, 1989
    Assignee: Tosoh Corporation
    Inventor: Yosuke Ohkura
  • Method for fluorometric analysis of catechol amines
    Patent number: 4705757
    Abstract: A method for fluorometric analysis of catecholamines characterized in that, after the addition of a catecholamine into a solution of 1,2-diphenylethylenediamine containing an oxidizing reagent at a pH of 4 to 10, the mixture is allowed to stand for more than 1 minute at a temperature of higher than 15.degree. C. to make cateocholamine fluorescent, is disclosed.
    Type: Grant
    Filed: March 29, 1985
    Date of Patent: November 10, 1987
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventor: Yosuke Ohkura
  • Ester of higher fatty acid and reagent for determination of activity of lipase
    Patent number: 4188320
    Abstract: An ester of higher fatty acid of the formula: ##STR1## wherein R and M are as defined hereunder, and a reagent for determination of the activity of lipase which contains said ester are disclosed. Such reagent is useful to determine the activity of lipase.
    Type: Grant
    Filed: September 20, 1978
    Date of Patent: February 12, 1980
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Shinichi Kamachi, Yosuke Ohkura