Patents by Inventor Robert A. Schall

Robert A. Schall 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).

  • Flow distribution means for screening apparatus
    Patent number: 4202777
    Abstract: Flow distribution means for a dewatering screen comprising a nozzle assembly having a rotatable valve and housing assembly extending transversely of the feed end of the screen. Manual or automatically operable actuator means are interconnected to the valve for controlling movement thereof to vary the size of the spout opening of the nozzle and for providing rapid opening of the spout for purging the nozzle assembly.
    Type: Grant
    Filed: January 2, 1979
    Date of Patent: May 13, 1980
    Assignee: Dorr-Oliver Incorporated
    Inventor: Robert A. Schall