Patents by Inventor Stephen H. Elrod

Stephen H. Elrod 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).

  • Aqueous drilling fluid and lubricant composition
    Patent number: 4181617
    Abstract: An aqueous drilling fluid is provided having a lubricant therein consisting essentially of the reaction product of a fatty vegetable oil with 4,4'-thiodiphenol.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: January 1, 1980
    Assignee: Milchem Incorporated
    Inventors: Stephen H. Elrod, Weldon B. Nance