Patents by Inventor Robert R. Pas

Robert R. Pas 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).

  • Carboxymethyl guar based drilling fluids
    Patent number: 4743384
    Abstract: Disclosed are (1) drilling fluid compositions consisting essentially of an aqueous medium selected from the group consisting of fresh and tap water, natural and synthetic sea water, and natural and synthetic brine, and carboxymethyl guar having a degree of substitution (D.S.) of 0.1 to 0.4; (2) drilling fluid compositions consisting essentially of an aqueous medium selected from the group consisting of fresh and tap water, natural and synthetic sea water, and natural and synthetic brine, a carboxymethyl guar having a D.S. of from 0.1 to 0.4, and a metal salt selected from the group consisting of water-soluble metal carbonates and bicarbonates; and (3) drilling fluid compositions consisting essentially of an aqueous medium selected from the group consisting of fresh and tap water, a carboxymethyl guar having a D.S. of from 0.1 to 0.4, a metal salt selected from the group consisting of water-soluble metal carbonates and bicarbonates, and a noncarbonate polyvalent metal salt.
    Type: Grant
    Filed: May 13, 1986
    Date of Patent: May 10, 1988
    Assignee: Aqualon Company
    Inventors: Cheng-Fa Lu, Carl A. Lukach, Robert R. Pas