Patents by Inventor Kazhisa Iwasa

Kazhisa Iwasa 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).

  • Coated spherical SiO.sub.2 particles
    Patent number: 5846310
    Abstract: Spherical SiO.sub.2 particles with a size of from 5 to 500 nm coated at individual points with TiO.sub.2, Fe.sub.2 O.sub.3 or ZrO.sub.2 particles with a size of less than 60 nm. The coated SiO.sub.2 particles can be aftercoated with silanes or further metal oxides. The products obtained are used for pigmenting paints, printing inks, plastics and coatings or as sunscreen agents.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: December 8, 1998
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Tamio Noguchi, Kazhisa Iwasa, Ralf Anselmann, Martin Knapp, Manuela Loch