Patents Assigned to Yo Isogai
  • Plant growth regulators
    Patent number: 4397678
    Abstract: Plant growth regulators of the N-(4-pyridazinyl)urea and thiourea type are disclosed which exhibit excellent cytokinin-like activities and are useful for regulating plant growth in various manners, such as acceleration and suppression.
    Type: Grant
    Filed: January 27, 1982
    Date of Patent: August 9, 1983
    Assignees: Toshihiko Okamoto, Yo Isogai, Koichi Shudo, Susumu Sato
    Inventors: Toshihiko Okamoto, Yo Isogai, Koichi Shudo, Soshiro Takahashi
  • Pyridazine urea plant growth regulators
    Patent number: 4331807
    Abstract: Plant growth regulators of the N-(4-pyridazinyl)urea and thiourea type are disclosed which exhibit excellent cytokinin-like activities and are useful for regulating plant growth in various manners, such as acceleration and suppression.
    Type: Grant
    Filed: May 30, 1980
    Date of Patent: May 25, 1982
    Assignees: Toshihiko Okamoto, Yo Isogai, Koichi Shudo, Susumu Sato
    Inventors: Toshihiko Okamoto, Yo Isogai, Koichi Shudo, Soshiro Takahashi
  • N-(2-Substituted-4-pyridyl)ureas and thioureas as well as plant growth regulators containing same, and method for using compounds as plant growth regulators
    Patent number: 4279639
    Abstract: Plant growth and suppression regulators of the N-(2-substituted-4-pyridyl)urea and thiourea type are provided, which exhibit excellent cytokinin-like activities and are thus useful for regulating plant growth in various fashions, such as acceleration of growth when used in flowering or fruiting at a controlled time when used in small amounts, and controlling compositions such as sugar, alkaloids, etc. of plants, or suppression of plant growth when used in an amount higher than optimal for growth acceleration, etc.
    Type: Grant
    Filed: August 1, 1979
    Date of Patent: July 21, 1981
    Assignees: Toshihiko Okamoto, Yo Isogai, Koichi Shudo, Susumu Sato
    Inventors: Toshihiko Okamoto, Yo Isogai, Koichi Shudo, Soshiro Takahashi
  • N-(2-Chloro-4-pyridyl) ureas
    Patent number: RE31550
    Abstract: N-(2-Chloro-4-pyridyl)ureas represented by the formula (I): ##STR1## wherein R.sub.1 represents hydrogen or alkyl, R.sub.2 represents an aromatic group, especially phenyl, which may be substituted by alkyl, alkoxyl, hydroxyl or halogen, and X is oxygen or sulfur, and acid addition salts thereof, useful as plant growth regulators, are disclosed. Method of making and using same and agricultural compositions thereof are also disclosed.
    Type: Grant
    Filed: September 25, 1981
    Date of Patent: April 10, 1984
    Assignees: Koichi Shudo, Toshihiko Okamoto, Yo Isogai, Soshiro Takahashi
    Inventors: Koichi Shudo, Toshihiko Okamoto, Yo Isogai, Soshiro Takahashi