Patents by Inventor Kikuko Yokoyama, heir

Kikuko Yokoyama, heir 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).

  • Condensation catalyst and catalytical condensation process for organic carboxylic anhydrides
    Patent number: 4981982
    Abstract: A condensation reaction catalyst useful for producing an organic compound, for example, anthraquinone compounds from phthalic dianhydride and optionally benzene, comprises a catalytic principal component consisting of a solid acid substance, for example, compound oxides or zeolite, and an additional basic component consisting of ammonia or a volatile organic base, for example, isopropylamine, n-butylamine, or pyridine, and attached to at least strong acid sites of the solid acid substance.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: January 1, 1991
    Inventors: Yoshio Yokoyama, Kikuko Yokoyama, heir