Patents by Inventor Toshiufumi Hiratsuka

Toshiufumi Hiratsuka 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).

  • Publication number: 20050188684
    Abstract: In an exhaust gas purifying apparatus provided with a lean NOx catalyst supporting a catalyst layer, which contains a NOx trapping component, on a honeycomb substrate formed so as not to cause an alkali attack, the invention prevents trapped NOx from being dissociated and exhausted during the time of a rich spike. A NOx reducing catalyst with the function of reducing NOx by a reductant in a rich or stoichiometric condition, e.g., a three-way catalyst, is disposed downstream of the lean NOx catalyst. In the case of increasing the amount of the NOx trapping component in the lean NOx catalyst to enhance a NOx trapping capability, even if a part of trapped NOx is dissociated during the time of the rich spike, the dissociated NOx can be reduced by the NOx reducing catalyst disposed on the downstream side.
    Type: Application
    Filed: February 10, 2005
    Publication date: September 1, 2005
    Applicant: Hitachi, Ltd.
    Inventors: Norihiro Shinotsuka, Osamu Kuroda, Yuichi Kitahara, Takeshi Inoue, Toshiufumi Hiratsuka, Hiroko Watanabe, Hidehiro Iizuka