Patents by Inventor Isao Aoki

Isao Aoki 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).

  • 1,2,4-triazine-3, 5-dione derivatives, their production and use thereof
    Patent number: 5985875
    Abstract: The present invention relates to compounds represented by the formula: ##STR1## wherein R.sup.1 is (1) an optionally substituted alkyl group which may be bonded through a hetero atom, (2) an optionally substituted acyl group, (3) an alkylsulfonyl group, (4) an alkylsulfinyl group, or (5) an optionally substituted sulfamoyl group; A is --N.dbd. or -CH.dbd.; R.sup.2 is a hydrogen atom or an alkyl group which may optionally be substituted with halogen and which may be bonded through a hetero atom;X.sup.1 is halogen or a lower alkyl group;X.sup.2 is a hydrogen atom or a fluorine atom;R.sup.3 is a hydrogen atom, halogen or a lower alkyl group;and R.sup.4 is a hydrogen atom, an optionally substituted alkyl group or an acyl group, provided that when R.sup.1 is (1) a C.sub.1-4 alkanoyl group, (2) benzoyl, (3) trifluoroacetyl, (4) sulfamoyl which may optionally be substituted with a C.sub.1-4 alkyl group, (5) a C.sub.1-4 alkyl group which may optionally be substituted with hydroxy, halogen or a C.sub.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: November 16, 1999
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Hideki Miki, Isao Aoki, Koichi Iwanaga, Toshikatsu Hayashi
  • 1,1,1-trichloro-2-nitroethane production
    Patent number: 5364989
    Abstract: Methods for the production of 1,1,1-trihalogeno-2-nitroethanes from 1,1-dihalogenoethylene by using nitric acid or its salt and hydrogen chloride or hydrogen bromide or its salt, and for the production of .alpha.-unsaturated amines from the 1,1,1-trihalogeno-2-nitroethanes which are useful as insecticides.
    Type: Grant
    Filed: July 6, 1992
    Date of Patent: November 15, 1994
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Isao Aoki, Takanori Tabuchi, Isao Minamida
  • Herbicidal compounds, their production and use
    Patent number: 4897105
    Abstract: A compound of the general formula ##STR1## wherein R.sub.1 is a phenyl group which may be substituted, R.sub.2 and R.sub.3 respectively are a lower alkyl or lower alkoxy group, Z is CH or N and n is 0 or 1, or a salt thereof which is useful as a herbicide.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: January 30, 1990
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Yoshiyuki Okada, Isao Aoki, Nobuyuki Okajima, Takashi Kuragano
  • Herbicidal pyrazole sulfonyl Imino-2H-1,2,4-thiadiazolo[2,3-a9 pyrimidines
    Patent number: 4872901
    Abstract: Novel compounds of the formula: ##STR1## wherein R.sub.1 is a pyrazolyl group which may be substituted; R.sub.2 and R.sub.3 respectively are a lower alkyl group or a lower alkoxy group; and Z is CH or N, which are useful as herbicides.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: October 10, 1989
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Isao Aoki, Takashi Kuragano, Nobuyuki Okajima, Yoshiyuki Okada