Patents by Inventor Sam B. Ledbetter

Sam B. Ledbetter 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).

  • Reducing fluid loss in a drilling fluid
    Patent number: 6730637
    Abstract: This invention relates to a low toxicity drilling mud oil. In some embodiments, the fluid loss characteristic of the drilling mud oil as used in a borehole can be reduced to less than 0.2 ml/30 minutes by adding about 0.05% to about 2.0% by weight of a butadiene-styrene-butadiene (BSB) block copolymer having about 20% by weight or more styrene.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: May 4, 2004
    Assignee: Chevron Phillips Chemical Company, LP
    Inventors: Wayne S. Stewart, Nathan E. Stacy, Kelly B. Fox, Bharat B. Patel, Sam B. Ledbetter, Alvin Evans