Patents by Inventor Charles R. Hlavach

Charles R. Hlavach 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).

  • Wastewater treatment apparatus
    Patent number: 5326459
    Abstract: Disclosed herein is a wastewater treatment facility comprising a structure defining first and second tank portions; a shaft rotatably supported by the structure; a first biological reactor in the first tank portion and including a first rotatable biological contactor mounted to the shaft and having a diameter; and a second biological reactor in the second tank portion and including a second rotatable biological contactor mounted to the shaft and having a diameter greater than the diameter of the first rotating biological contactor.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: July 5, 1994
    Assignee: Envirex Inc.
    Inventors: Charles R. Hlavach, Keith A. Bergemann