Patents by Inventor Kazo Tokubo

Kazo Tokubo 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).

  • Packing material for liquid chromatography
    Patent number: 5145578
    Abstract: A packing material for liquid chromatography, comprising a spherical clay mineral powder which comprises a naturally occurring or synthetic water-swellable clay mineral, a clay mineral having foreign cations substantially substituted for interlayer ions inherently present in the naturally occurring or synthetic water-swellable clay mineral, or a calcined product thereof.
    Type: Grant
    Filed: September 24, 1990
    Date of Patent: September 8, 1992
    Assignee: Shiseido Company Ltd.
    Inventors: Kazo Tokubo, Michihiro Yamaguchi, Yutaka Ohtsu, Kiyoshi Nakamura, Satoshi Matsumoto, Akihiko Yamagishi