Patents by Inventor Kazuyuki Sakota

Kazuyuki Sakota 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).

  • Device for testing body fluids
    Patent number: 5178831
    Abstract: A device for testing body fluids includes (a) a test reagent layer (1) formed on a substrate (5) and containing a test reagent, the tone of which changes according to the content of a test-objective material in a solution to be tested, and (b) a tone layer for criterion (3) formed on the substrate (5) and having a color formed by a dye or the like. The tone layer is used in order to judge the hue of the resulting color of the test reagent layer, wherein both the test layer (1) and the tone layer (3) have the property of absorbing the solution to be tested, and the hue of the resulting color of the test reagent layer and the hue of the tone layer can be compared by their wet colors, thereby affording a highly precise body fluid test.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: January 12, 1993
    Assignee: Dai Nippon Insatsu Kab Ushiki Kaisha
    Inventors: Kazuyuki Sakota, Junichi Kondo, Masanao Watanabe
  • Process for preparing heterocyclic copolymers
    Patent number: 4914163
    Abstract: According to the present invention, heterocyclic copolymers comprising recurring units [A] and [B] having specific structures are obtained by hydrolyzing reaction products of diisocyanate compounds having specific structures with tolidine diisocyanate and hydrogen cyanide.The heterocyclic copolymers thus obtained are excellent in mechanical strength, heat resistance and solvent resistance.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: April 3, 1990
    Assignees: Tonen Sekiyu Kagaku Kabushiki Kaisha, Nitto Chemical Industry Co., Ltd.
    Inventors: Kazuyuki Sakota, Wataru Minoshima, Takayuki Masuda, Chihiro Imai, Tetsuro Nakahama, Toshimitsu Sugawara, Yoshio Nakagawa
  • Process for producing wholly aromatic polyesters
    Patent number: 4684712
    Abstract: Wholly aromatic polyesters having improved mechanical properties are produced by polycondensing a raw material or raw material mixture capable of forming an aromatic polyester and not more than about 18 mole %, based on the total amount of the entire raw materials, of 2-hydroxynaphthalene-6-carboxylic acid or its derivative.
    Type: Grant
    Filed: June 6, 1986
    Date of Patent: August 4, 1987
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Kazuyuki Sakota, Yasunori Nakamura
  • Process for producing aromatic hydroxy compound
    Patent number: 4633024
    Abstract: A process for producing an aromatic hydroxy compound which comprises reacting an alkali metal salt of an aromatic sulfonic acid with an alkali metal hydroxide in a reaction medium which is an aliphatic, alicyclic or aromatic hydrocarbon, or an aromatic ether or a mixture of these.
    Type: Grant
    Filed: May 1, 1985
    Date of Patent: December 30, 1986
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Kazuyuki Sakota, Yoshiyuki Naito, Mitsuyuki Kishimoto
  • Process for producing hydroxybenzonitriles
    Patent number: 4436670
    Abstract: A process for producing a hydrozybenzonitrile, which comprises reacting a hydroxybenzoic acid ester with ammonia in the vapor phase in the presence of a boron phosphate supported catalyst.
    Type: Grant
    Filed: September 1, 1982
    Date of Patent: March 13, 1984
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyuso
    Inventors: Ryuzo Ueno, Kazuyuki Sakota, Keiji Kawata, Yoshiyuki Naito