Patents by Inventor Darrel W. Brownawell

Darrel W. Brownawell 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).

  • Oxazolines of 2-(alkylthio)succinic acids as an additive for drilling muds
    Patent number: 4455429
    Abstract: A bis-oxazoline of the formula: ##STR1## wherein R represents an alkyl group of 6 to 50 carbons and X is selected from the group containing of an alkyl or hydroxyalkyl group and at least one of the X substituents being a hydroxy alkyl group of the structure --(CH.sub.2).sub.n OH where n is 1 to 3, which is useful in improving the lubricity of aqueous drilling muds.
    Type: Grant
    Filed: September 21, 1983
    Date of Patent: June 19, 1984
    Assignee: Exxon Research & Engineering Co.
    Inventors: Antonio Gutierrez, Darrel W. Brownawell, Robert C. Portnoy, Stanley J. Brois