Patents by Inventor Johann H. Metternich

Johann H. Metternich 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).

  • Particle concentration measuring method and device
    Patent number: 4981362
    Abstract: The method and apparatus for measuring the particle concentration in a fluid that is passed between a reciprocally movable window and a single photodetector. A collimated beam of light is directed through the window and fluid to the photodetector. The window is moved from a first predetermined location to a second predetermined location to vary the light beam path length, thus enabling at least two different photodetector output signals. The ratio of the two signals provides the data needed to determine the particle concentration in the fluid.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: January 1, 1991
    Assignee: Xerox Corporation
    Inventors: Joannes N. M. deJong, Gerald A. Domoto, John J. Ricciardelli, Gerhard H. Bay, Johann H. Metternich