Patents by Inventor Katsuyuki Watanabe

Katsuyuki Watanabe 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 and test composition for determination of hydrogen peroxide
    Patent number: 4384042
    Abstract: Disclosed is a method for the colorimetric determination of hydrogen peroxide in a sample by reacting a particular chromogen with the hydrogen peroxide in the presence of peroxidase and measuring the absorbancy of the reaction solution in the visible ray region. Also disclosed is a test composition for carrying out the determination.
    Type: Grant
    Filed: July 29, 1981
    Date of Patent: May 17, 1983
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Akira Miike, Yoshiaki Shimizu, Toshio Tatano, Katsuyuki Watanabe
  • Method of determining cholinesterase activity and choline derivatives for use in the method
    Patent number: 4271310
    Abstract: Cholinesterase activity is determined by means of the choline and/or acid obtained by the action of cholinesterase on a compound of the formula: ##STR1## [wherein A represents a hydrogen atom or a C.sub.1-5 alkyl or alkoxy group and B represents a group of the formula --R-COO-- (in which --R-- represents an alkenyl group with 2 to 6 carbon atoms); or A represents a hydroxy group in either or both o-positions of the benzene ring or a C.sub.1-5 alkyl group and B represents a group of the formula --COO--; X represents a stabilizing anion and n represents the charge on the anion]. The method of the invention ensures a high resistance to saturation, good stability of the compounds used as substrates, a conveniently low reaction rate and a high degree of accuracy.Certain of the compounds of formula I as defined above are novel compounds which are claimed per se.Examples of the method of the present invention are given and the preparation of the novel compounds is described and exemplified.
    Type: Grant
    Filed: April 12, 1979
    Date of Patent: June 2, 1981
    Assignee: Kyowa Hakko Kogyo Kabushiki Kaisha
    Inventors: Katsuyuki Watanabe, Tadatoshi Hayashi, Hiroaki Hayashi, deceased, by Atsuko Hayashi, heir, by Yuko Hayashi, heir, Toshio Tatano, Yoshiaki Shmizu
  • Composition and method for the quantitative determination of phospholipids
    Patent number: 4141792
    Abstract: Phospholipid content in a sample is quantitatively determined by enzymatically converting the phospholipids into choline and then determining the amount of the choline.
    Type: Grant
    Filed: August 17, 1977
    Date of Patent: February 27, 1979
    Inventors: Hiroaki Hayashi, Katsuyuki Watanabe, Toshio Tatano