Patents by Inventor Yutaka Nagahisa

Yutaka Nagahisa 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).

  • Fuelling apparatus
    Patent number: 5172738
    Abstract: This invention relates to an apparatus: to determine the concentration of vehicular fuel vapor contained in a fuel tank of a vehicle; to examine the difference between the measured fuel vapor concentration and an internal reference standard based on the concentration of ambient vapors; to issue a warning to report an abnormality in the system if an unusual deviation, from the predetermined allowable range of differences, is detected therein; and to shut off the fuelling operation until the cause of the abnormality has been rectified.
    Type: Grant
    Filed: September 13, 1990
    Date of Patent: December 22, 1992
    Assignee: Tokico Ltd.
    Inventors: Shigemi Komukai, Yutaka Nagahisa