Patents by Inventor Franklin J. Koehler

Franklin J. Koehler 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).

  • Buoyant ceiling wiper for stacked tank clarifier
    Patent number: 5250178
    Abstract: Disclosed herein is a wastewater treatment facility including a stacked tank clarifier having a lower tank, and an upper tank above the lower tank, the upper tank having a bottom defining a ceiling of the lower tank, and the lower tank further having a floor. The wastewater treatment facility includes a mechanism for scraping the ceiling of the lower tank. The mechanism includes a driven endless chain loop in the lower tank, and a buoyant member carried by the chain loop.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: October 5, 1993
    Assignee: Envirex Inc.
    Inventors: Thomas J. Casper, Peter G. Dobbeck, Franklin J. Koehler, Susan M. Rasper, John Thomas