Patents by Inventor Naohiko Sasajima

Naohiko Sasajima 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).

  • Temperature fixed-point cell, temperature fixed-point device and method of calibration of thermometer
    Patent number: 7585106
    Abstract: A temperature fixed-point cell is configured with a crucible composed of carbon and a fixed-point material enclosed in the crucible. The fixed-point material has a peritectic structure of carbon and a carbon compound. A thermometer is calibrated by installing the temperature fixed-point crucible in a furnace, increasing or decreasing the ambient temperature thereof, measuring the temperature of the temperature fixed-point cell with the thermometer, observing the state of temperature change, and using this state of temperature change as a basis for the calibration. This invention is aimed at realizing a fixed point in the temperature range exceeding the copper point and accomplishing great improvement in accuracy in the calibration of radiation thermometers, thermocouples and all thermometers used in high temperature ranges.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: September 8, 2009
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Yoshiro Yamada, Naohiko Sasajima
  • TEMPERATURE FIXED-POINT CELL, TEMPERATURE FIXED-POINT DEVICE AND METHOD OF CALIBRATION OF THERMOMETER
    Publication number: 20070201534
    Abstract: A temperature fixed-point cell is configured with a crucible composed of carbon and a fixed-point material enclosed in the crucible. The fixed-point material has a peritectic structure of carbon and a carbon compound. A thermometer is calibrated by installing the temperature fixed-point crucible in a furnace, increasing or decreasing the ambient temperature thereof, measuring the temperature of the temperature fixed-point cell with the thermometer, observing the state of temperature change, and using this state of temperature change as a basis for the calibration. This invention is aimed at realizing a fixed point in the temperature range exceeding the copper point and accomplishing great improvement in accuracy in the calibration of radiation thermometers, thermocouples and all thermometers used in high temperature ranges.
    Type: Application
    Filed: February 23, 2007
    Publication date: August 30, 2007
    Applicant: National Institute of Adv. Industrial Sci. & Tech.
    Inventors: Yoshiro Yamada, Naohiko Sasajima
  • Fixed-point cell, thermometer calibration method and fixed-point temperature realizing apparatus
    Patent number: 6641299
    Abstract: A thermometer calibration method and fixed-point temperature realizing apparatus uses a fixed-point cell including a crucible of carbon and a fixed-point material enclosed in the crucible. The fixed-point material is a eutectic structure of carbide and carbon. The fixed-point cell is placed in a furnace for increasing and decreasing the environmental temperature of the cell. A thermometer to be calibrated is used to measure temperature variations in the cell and calibrated based on the temperature variations thus measured.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: November 4, 2003
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Naohiko Sasajima, Yoshiro Yamada
  • Fixed-point cell, thermometer calibration method and fixed-point temperature realizing apparatus
    Publication number: 20020122457
    Abstract: A thermometer calibration method and fixed-point temperature realizing apparatus uses a fixed-point cell including a crucible of carbon and a fixed-point material enclosed in the crucible. The fixed-point material is a eutectic structure of carbide and carbon. The fixed-point cell is placed in a furnace for increasing and decreasing the environmental temperature of the cell. A thermometer to be calibrated is used to measure temperature variations in the cell and calibrated based on the temperature variations thus measured.
    Type: Application
    Filed: March 4, 2002
    Publication date: September 5, 2002
    Applicant: National Inst. of Advanced Ind. Science and Tech.
    Inventors: Naohiko Sasajima, Yoshiro Yamada