Patents by Inventor Jack M. Calkins

Jack M. Calkins 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