Patents by Inventor Tatsunari KOYAMA

Tatsunari KOYAMA 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).

  • Publication number: 20210255023
    Abstract: Provided is a liquid sensor capable of relatively accurately detecting the liquid level even if vibration or the like occurs. The liquid sensor is configured to detect a liquid level in a state in which at least a portion of the liquid sensor is immersed in liquid. This liquid sensor includes a substrate. The substrate is provided with a hole. An inner circumferential surface of the substrate is formed around the hole. A first electrode and a second electrode facing the first electrode are formed on the inner circumferential surface. The liquid sensor further includes a detection circuit. The detection circuit is configured to detect capacitance between the first and second electrodes.
    Type: Application
    Filed: February 18, 2021
    Publication date: August 19, 2021
    Applicant: NIPPON PILLAR PACKING CO., LTD.
    Inventors: Tatsunari KOYAMA, Akira NAKATSU
  • Patent number: 11035893
    Abstract: The present invention intends to provide a liquid sensor device that achieves both the improvement of durability and the improvement of property determination accuracy. The liquid sensor device includes: an electrode pair 22 that is formed on a sensor board 2 and covered by an insulating protective film 201; a resistance measurement part 302 that supplies AC current to the electrode pair 22 to measure the resistance value of oil 4; a parasitic capacitance storage part 304 that holds the parasitic capacitance Cs of the electrode pair 22; and a property determination part 313 that, on the basis of the resistance value R1 and the parasitic capacitance Cs, determines the deterioration of the oil 4.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: June 15, 2021
    Assignee: NIPPON PILLAR PACKING CO., LTD.
    Inventors: Tatsunari Koyama, Akira Nakatsu
  • Publication number: 20200363390
    Abstract: An oil condition determination system includes a resistance value measurement unit and a determination unit. The resistance value measurement unit applies a measurement voltage between a pair of measurement electrodes in contact with oil to measure a resistance value of the oil. The determination unit determines, when a change tendency of the resistance value of the oil is reversed, that condition of the oil is changed.
    Type: Application
    Filed: January 30, 2019
    Publication date: November 19, 2020
    Inventors: Masatoshi SASAKI, Yasuteru ASAKAWA, Tomomi HONDA, Tatsunari KOYAMA, Akira NAKATSU
  • Publication number: 20200003813
    Abstract: The present invention intends to provide a liquid sensor device that achieves both the improvement of durability and the improvement of property determination accuracy. The liquid sensor device includes: an electrode pair 22 that is formed on a sensor board 2 and covered by an insulating protective film 201; a resistance measurement part 302 that supplies AC current to the electrode pair 22 to measure the resistance value of oil 4; a parasitic capacitance storage part 304 that holds the parasitic capacitance Cs of the electrode pair 22; and a property determination part 313 that, on the basis of the resistance value R1 and the parasitic capacitance Cs, determines the deterioration of the oil 4.
    Type: Application
    Filed: June 12, 2019
    Publication date: January 2, 2020
    Applicant: NIPPON PILLAR PACKING CO., LTD.
    Inventors: Tatsunari KOYAMA, Akira NAKATSU