Patents by Inventor Yoshio Ishihara

Yoshio Ishihara 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).

  • Electric conductivity measuring cell
    Patent number: 5444379
    Abstract: An electric conductivity-measuring cell comprises a pressure container serving also as an outer electrode and provided with an inlet port of a liquid to be measured and an outlet port and an inner electrode provided within said pressure container so as to simplify it in construction and improve a measurement in accuracy.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: August 22, 1995
    Assignees: Horiba, Ltd., Nippon Sanso Corporation, Tadahiro Ohmi
    Inventors: Tadahiro Ohmi, Yoshio Ishihara, Ryosuke Fukushima
  • Method of measuring very small quantity of impurity in gas
    Patent number: 5414361
    Abstract: A method capable of accurately and inexpensively measuring a very small quantity of impurities, such as water, contained in chemical substances, which are gaseous at normal temperature and pressure, is provided. A concentration of a very small quantity of impurities, contained in the chemical substances, which are gaseous at normal temperature and pressure, is measured by introducing the chemical substances into a cell under the condition of liquefied gases to measure an electric conductivity of the liquefied gases.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: May 9, 1995
    Assignees: Horiba, Ltd., Nippon Sanso Corporation, Tadahiro Ohmi
    Inventors: Tadahiro Ohmi, Yoshio Ishihara, Ryosuke Fukushima