Patents by Inventor Katsumasa Ohkawa

Katsumasa Ohkawa 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).

  • Phenoxyphthalates and herbicide containing the same
    Patent number: 4334915
    Abstract: A phenoxyphthalate of the formula ##STR1## wherein X represents chlorine atom or trifluoromethyl group and R and R' represent methyl or ethyl group, is novel and has a strong herbicidal activity.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: June 15, 1982
    Assignee: Nihon Nohyaku Co. Ltd.
    Inventors: Kunikazu Hiraga, Masakazu Shibayama, Katsumasa Ohkawa, Tatsuo Harada