Patents by Inventor Robert C. Greenlund

Robert C. Greenlund 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).

  • Patent number: 5065416
    Abstract: An on-line slurry ash monitoring system for evaluating the composition of coal slurries in coal preparation plants. A coal slurry is introduced into a sample reservoir where it is removed and passed through a closed loop slurry transport system which causes the sample to be directed through a sensor and recirculated back to the reservoir. In order to enhance sensor accuracy, a sample is exposed to vacuum pressure conditions which removes gas bubbles and dissolved gases from the sample. The sensor is preferably a radiation absorption type in which characteristic absorptions of coal particles, ash and iron are evaluated by associated electronics to provide an output of slurry composition.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: November 12, 1991
    Assignee: Process Technology, Inc.
    Inventors: Melvin J. Laurila, Robert J. Brown, Robert C. Greenlund