Patents by Inventor Katuo Kawachi

Katuo Kawachi 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).

  • Method and apparatus for analysis of gases using plasma
    Patent number: 5252827
    Abstract: In the analysis of a specimen gas for at least one impurity, the specimen is fed to a microwave-induced plasma and the plasma is analyzed for the impurity. The plasma is formed by gases fed to it via an inner tube and an outer tube around said inner tube. The specimen is fed in undiluted form via the inner tube and a second gas which may be a standard gas is fed via the outer tube. The specimen gas and the second gas have compositions which are the same as to at least 75% by volume, e.g. are both air. A variety of analysis processes is made available.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: October 12, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Masataka Koga, Toyoharu Okumoto, Hiromi Yamashita, Katuo Kawachi, Yukio Okamoto