Patents by Inventor Takeshi Yakuwa

Takeshi Yakuwa 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).

  • Flowmeter calibration apparatus
    Publication number: 20020157448
    Abstract: A heat type mass flowmeter calibration apparatus includes standard heat type mass flowmeters and sonic nozzle type mass flowmeters connected in series. Periodically or when required, the national-standard-traceable sonic nozzle type mass flowmeter that is traceable with respect to a national standard is used to calibrate the standard heat type mass flowmeters. Actual flowmeter measurements are conducted using the calibrated standard heat type mass flowmeter values. Therefore, consistently high precision of calibrations and measurements is guaranteed.
    Type: Application
    Filed: January 11, 2001
    Publication date: October 31, 2002
    Inventors: Katahisa Hirai, Masao Hayakawa, Takeshi Yakuwa, Akira Hirai