Patents by Inventor Joseph Yamada

Joseph Yamada 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).

  • Porous inorganic particles modified with amino and carboxyl groups
    Patent number: 4816499
    Abstract: Porous inorganic particles, such as silica gel particles, modified with amino-containing groups and carboxyl-containing groups are disclosed. The modified porous particles, useful as packing materials for column chromatography, are obtained by a method including the steps of providing porous, amino group-carrying, inorganic particles, and converting a portion of the amino groups into carboxyl-containing groups.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: March 28, 1989
    Assignee: Director General of Agency of Industrial Science and Technology
    Inventors: Akira Nomura, Joseph Yamada