Patents by Inventor Keiji Monbetsu

Keiji Monbetsu 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).

  • Patent number: 5695730
    Abstract: The present invention provides silicic acid hydrate having a large pore volume and tiny particle diameters, and a process for preparing it. There is disclosed silicic acid hydrate obtained by neutralizing an aqueous solution of sodium silicate with a mineral acid, which has particle properties represented by an oil absorption of 250 to 350 ml/100 g, a total pore volume of 4.0 to 6.0 cc/g, an average pore radius of 200 to 400 .ANG., and an average pore diameter of 3.0 to 15 .mu.m by the laser method, or 2.0 to 4.0 .mu.m by the coulter method, or 0.5 to 3.5 .mu.m by the centrifugal precipitation method.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: December 9, 1997
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Kuniaki Maejima, Shigeki Yamagata, Tomohiro Banda, Masaru Kishida, Keiji Monbetsu, Tsutomu Naito