Patents by Inventor Tarou Yokoi

Tarou Yokoi 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).

  • Exhaust gas purification device for an engine and A/F ratio control for early activating a NOx trapping catalyst
    Patent number: 6516612
    Abstract: An exhaust gas purification device including three-way catalysts connected to engine cylinder groups and arranged in parallel, and a NOx trapping catalyst connected with the three-way catalysts downstream thereof. A controller controls fuel injection for making an A/F ratio of exhaust gas flowing into one of the three-way catalysts rich relative to a stoichiometric A/F ratio when it is required to reduce the NOx trapped by the NOx trapping catalyst.
    Type: Grant
    Filed: February 2, 2000
    Date of Patent: February 11, 2003
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tarou Yokoi, Hirofumi Tsuchida, Keiji Okada, Kouji Ishihara