Patents by Inventor Shuichiro Asao

Shuichiro Asao 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).

  • 2-Alkoxy pyridazinoquinazolinone derivatives as herbicides
    Patent number: 4256483
    Abstract: A compound of the formula: ##STR1## wherein R is a methyl group or an ethyl group shows a strong herbicidal activity against a wide variety of weeds without any material chemical injury to crop plants.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: March 17, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shuichiro Asao, Yoshinori Nakayama, Ryo Yoshida, Seizo Sumida, Shunichi Hashimoto
  • Imidazolidinedione compounds, and their production and use
    Patent number: 4237122
    Abstract: An imidazolidinedione compound of the formula: ##STR1## wherein X is a chlorine atom or a bromine atom, Y is an oxygen atom or a sulfur atom, and R.sub.1 and R.sub.2 are each a C.sub.1 -C.sub.4 alkyl group, a C.sub.1 -C.sub.4 alkoxy group, a C.sub.1 -C.sub.4 alkylthio group, an ar(C.sub.1 -C.sub.4)alkylthio group, a C.sub.1 -C.sub.4 alkoxy(C.sub.2 -C.sub.4)alkoxy group, a phenyl group, a phenoxy group, a C.sub.1 -C.sub.4 alkylthiophenoxy group, a C.sub.1 -C.sub.8 alkylamino group, a C.sub.2 -C.sub.8 alkenylamino group or a cyano(C.sub.1 -C.sub.4)alkylamino group, which is useful as an agricultural chemical such as insecticides, acaricides, nematocides and/or fungicides with high safety to mammalian animals and human beings.
    Type: Grant
    Filed: June 15, 1979
    Date of Patent: December 2, 1980
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shuichiro Asao, Shigeo Yamamoto, Yoshio Hisada, Yoshinori Nakayama, Chiyozo Takayama
  • 1-Branched-alkylcarbonyl-3-(3,5-dihalophenyl)imidazolidine-2,4-diones
    Patent number: 4181732
    Abstract: 1-Branched-alkylcarbonyl-3-(3,5-dihalophenyl)imidazolidine-2,4-diones of the formula: ##STR1## wherein X is a chlorine or bromine atom and R is a C.sub.3 -C.sub.5 branched alkyl group, which show high fungicidal activities without any material toxicity to mammals and plants and which can be produced by reacting the corresponding 1-unsubstituted compound with a branched alkanecarboxylic acid or a reactive derivative thereof.
    Type: Grant
    Filed: July 20, 1978
    Date of Patent: January 1, 1980
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Chiyozo Takayama, Shigeo Yamamoto, Toshiro Kato, Yoshio Hisada, Shuichiro Asao, Yoshinori Nakayama