Patents by Inventor Michael L. Hartmann

Michael L. Hartmann 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 for reclaiming internal pipe mineral buildup
    Patent number: 5197173
    Abstract: Short pipe sections having mineral material deposit buildup therein are forced toward and upon a diametric wedge-type blade by a hydraulic ram, there being provided a guide for maintaining proper orientation of the pipe section being cut between the ram and the cutting blade.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: March 30, 1993
    Inventors: Bennie R. Stokes, Sr., Michael L. Hartmann