Patents by Inventor Michael R. Lotzer

Michael R. Lotzer 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).

  • Method and apparatus for measuring vane wear in a sliding vane rotary pump
    Patent number: 7216526
    Abstract: The amount of wear on the vanes of a sliding vane rotary pump is determined by inserting a wear inspection dip stick into a wear inspection port providing in a housing of the sliding vane rotary pump. The wear dipstick includes one or more mark providing an indication of the amount of wear on the vanes, and a marking member which provides an indication of current vane length and allows a maintenance person to easily determine when a pump replacement is required.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: May 15, 2007
    Assignee: Rapco, Inc.
    Inventors: Michael R. Lotzer, Richard W. Plenkers, Mark A. Gaulke