Patents by Inventor Mitsuto Hitomi

Mitsuto Hitomi 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 control system for internal combustion engine
    Patent number: 5233831
    Abstract: An exhaust control system has a first catalytic device disposed in an exhaust line and a second catalytic device, which is smaller in capacity than the first catalytic device, disposed in the exhaust line upstream from the first catalytic device. The system includes a shutter device disposed in the exhaust line upstream from the first catalytic device. The shutter device is caused, by a controller, to close the exhaust line during a predetermined period from a start of engine cranking, before an engine is warmed up, and open the exhaust line after the engine is warmed up, thereby promoting activation of the catalytic devices.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: August 10, 1993
    Assignee: Mazda Motor Corporation
    Inventors: Mitsuto Hitomi, Kenji Kashiyama, Ken Umehara