Patents by Inventor Douglas R. Fleming

Douglas R. Fleming 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).

  • Downhole roller vane motor
    Patent number: 6499976
    Abstract: A roller vane motor having a housing and a stator positioned on an inside surface of the housing. The stator has an internal wall with an inlet port and an outlet port and the portion of this internal wall at the outlet port tapers open at an angle of less than 45 degrees relative to a tangent of the internal wall. A rotor assembly is positioned within the stator. The rotor assembly includes: i) a rotor shaft, ii) a plurality of flutes extending from the rotor shaft; and iii) cylindrical rollers positioned between said flutes.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: December 31, 2002
    Inventors: Andrew J. McPhate, Matthew McPhate, Douglas R. Fleming