Patents by Inventor Tetsuho Yokoyama

Tetsuho Yokoyama 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).

  • Air conditioner system for automotive vehicles
    Patent number: 4865119
    Abstract: An air conditioner system for an automotive vehicle includes air cooling means, air heating means arranged downstream of the air cooling means, a bypass air passage bypassing the air heating means, means for detecting the temperature of intake air immediately before passing through the air cooling means, and means for comparing the intake air temperature detected by the intake air temperature detecting means and a desired temperature. The amount of air flow through the bypass air passage is controlled when the intake air temperature is lower than the desired temperature by a first predetermined deviation value, and the amount of air flow through the bypass air passage is controlled at the maximum value when the intake air temperature is greater than the desired temperature value by a second predetermined deviation value. The compressor is actuated when the intake air temperature is larger than the desired air temperature.
    Type: Grant
    Filed: February 2, 1987
    Date of Patent: September 12, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Tsugihiro Okada, Eiichi Ohtsu, Tetsuho Yokoyama