Patents by Inventor Tadahiro Nakada

Tadahiro Nakada 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: 7140201
    Abstract: A hydrous silica gel is dehydrated by freezing, thawing, and removing water separated by thawing, thereby yielding silica particles. In addition, the silica particles thus formed is washed and fired, thereby producing a synthetic quartz glass power. A water glass is dealkalized, an oxidizing agent and an acid are added, the mixture thus formed is passed through a hydrogen type cation exchange resin, the aqueous silica solution thus formed is then gelled, and the gelled material is then washed and fired, thereby producing a synthetic quartz powder. Silica is sequentially held for a predetermined time at each temperature range of 150 to 400° C., 500 to 700° C., and 1,100 to 1,300° C., thereby producing a quartz glass.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: November 28, 2006
    Assignees: M. Watanabe & Co., Ltd., Asahi Denka Kogyo Kabushiki Kaisha
    Inventors: Kunio Sugiyama, Shuichi Tada, Jinichi Omi, Tadahiro Nakada, Hiroshi Morita, Masaki Kusuhara, Hiroyuki Watanabe, Hirofumi Uehara, Keiko Sanpei
  • Publication number: 20030005724
    Abstract: A hydrous silica gel is dehydrated by freezing, thawing, and removing water separated by thawing, thereby yielding silica particles. In addition, the silica particles thus formed is washed and fired, thereby producing a synthetic quartz glass power.
    Type: Application
    Filed: June 28, 2002
    Publication date: January 9, 2003
    Inventors: Kunio Sugiyama, Shuichi Tada, Jinichi Omi, Tadahiro Nakada, Hiroshi Morita, Masaki Kusuhura, Hiroyuki Watanabe, Hirofumi Uehara, Keiko Sanpei
  • Patent number: 5631076
    Abstract: A hot melt ink thermal transfer recording sheet having enhanced color density, continuous tone and dot-reproducibilities and color brightness has an ink-receiving porous polymer coating layer having a plurality of pores with an average size of 0.5 to 30 .mu.m and an apparent density of 0.05 to 0.5 g/cm.sup.3, and formed on a substrate sheet by coating a coating liquid comprising a polymeric material and fine air bubbles introduced by a mechanical agitation so as to increase the apparent volume of the coating liquid to up to ten times the original volume, the laminate of the substrate with the ink-receiving porous polymer coating layer having a thermal conductivity of 0.25 W/(m.K) or less, as determined by the laser flash method.
    Type: Grant
    Filed: February 21, 1996
    Date of Patent: May 20, 1997
    Assignees: New OJI Paper Co., Ltd., Asahi Denka Kogyo K.K.
    Inventors: Masakazu Hakomori, Masatosi Maeda, Yoshio Mizuhara, Miwa Kimura, Toru Nakai, Kosuke Asaeda, Tadahiro Nakada, Masasi Oka