Patents by Inventor Kunitoshi Iguchi

Kunitoshi Iguchi 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 of preparing 2-phenyl benzotriazoles
    Patent number: 5187289
    Abstract: A method of preparing 2-phenylbenzotriazoles expressed by Formula I: ##STR1## (wherein R.sub.1 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms, a lower alkoxyl group having 1 to 4 carbon atoms, a carboxyl group or a sulfonic acid group; R.sub.2 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms or a lower alkoxyl group having 1 to 4 carbon atoms; R.sub.3 denotes a hydrogen or chlorine atom, an alkyl group having 1 to 12 carbon atoms, a lower alkoxyl group having 1 to 4 carbon atoms, a phenyl group, a phenyl group substituted by an alkyl group having 1 to 8 carbon atoms, a phenoxy group or a phenylalkyl group with an alkyl part having 1 to 4 carbon atoms; R.sub.4 denotes a hydrogen or chlorine atom, a hydroxyl group or an alkoxyl group having 1 to 4 carbon atoms; and R.sub.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: February 16, 1993
    Assignee: Chemipro Kasei Kaisha, Ltd.
    Inventors: Naohiko Fukuoka, Kazunobu Kubota, Kunitoshi Iguchi
  • Method of preparing 2-phenyl benezothriazoles
    Patent number: 5104992
    Abstract: A method of preparing 2-phenylbenzotriazoles expressed by Formula I: ##STR1## (wherein R.sub.1 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms, a lower alkoxyl group having 1 to 4 carbon atoms, a carboxyl group or a sulfonic acid group; R.sub.2 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms or a lower alkoxyl group having 1 to 4 carbon atoms; R.sub.3 denotes a hydrogen or chlorine atom, an alkyl group having 1 to 12 carbon atoms, a lower alkoxy group having 1 to 4 carbon atoms, a phenyl group, a phenyl group substituted by an alkyl group having 1 to 8 carbon atoms, a phenoxy group or a phenylalkyl group with an alkyl part having 1 to 4 carbon atoms; R.sub.4 denotes a hydrogen or chlorine atom, a hydroxyl group or an alkoxyl group having 1 to 4 carbon atoms; and R.sub.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: April 14, 1992
    Assignee: Chemipro Kasei Kaisha, Ltd.
    Inventors: Naohiko Fukuoka, Kazunobu Kubota, Kunitoshi Iguchi