Patents by Inventor Bruce Flanders

Bruce Flanders 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).

  • Patent number: 5791409
    Abstract: A downhole cutting tool for use in a wellbore, the cutting tool having a mandrel and a cylindrical knife body slidably mounted coaxially on the mandrel. The mandrel can be attached to or suspended from any type of workstring. The upper ends of a plurality of knife blades are pivotably mounted at fixed points on the knife body. The knife blades are suspended therefrom over a plurality of ramps formed on the exterior of the mandrel. A pressure chamber is formed between the knife body and the mandrel. Fluid from the work string can be directed through the mandrel to the pressure chamber, to drive the knife body downwardly relative to the mandrel, causing the lower ends of the knife blades to contact the ramps on the mandrel and kick or pivot outwardly to cause the lower tip of the blade to contact the downhole material to be cut. As the mandrel is rotated, the knife blades rotate with it and cut into the material.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: August 11, 1998
    Assignee: Baker Hughes Incorporated
    Inventor: Bruce Flanders