Patents by Inventor Toshihik Nishiyama

Toshihik Nishiyama 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 deNOx apparatus for engine
    Patent number: 6681564
    Abstract: An exhaust gas deNOx apparatus, which can make an NOx adsorber catalyst compact and does not impair reliability of an engine, is provided. To this end, the apparatus is provided with an NOx adsorber catalyst for adsorbing and releasing NOx, an exhaust gas recirculating circuit for mixing an exhaust gas into intake air, and an exhaust gas recirculating circuit adjusting valve and controller for recirculating a predetermined amount of the exhaust gas for reducing NOx when the adsorbed NOx accumulation amount is a predetermined value or less, and recirculating the aforementioned predetermined amount or more of exhaust gas to bring an air fuel ratio into a rich state when the adsorbed NOx accumulation amount exceeds a predetermined value and is to be released.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: January 27, 2004
    Assignee: Komatsu Ltd.
    Inventors: Toshihik Nishiyama, Koutaro Wakamoto