Patents by Inventor Weldon B. Nance

Weldon B. Nance 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).

  • Lubricating wellbore fluid and method of drilling
    Patent number: 4517100
    Abstract: A wellbore fluid having improved lubricating properties for drilling in formations in the earth comprising water and a lubricant composition containing a mixture of a chlorinated component and a sulfurized component in proportions to produce a lubricant composition containing 15 to 30 weight percent chlorine and 2 to 10 weight percent sulfur.
    Type: Grant
    Filed: February 7, 1983
    Date of Patent: May 14, 1985
    Assignee: Witco Chemical Corporation
    Inventors: Weldon B. Nance, Jack M. Calkins
  • 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