Patents by Inventor Vincent M. Thielen

Vincent M. Thielen 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).

  • Drilling mud additive
    Patent number: 4664818
    Abstract: An additive for drilling in water-sensitive shales comprising a partially hydrolyzed acrylamide-acrylate copolymer, potassium chloride and a polyanionic cellulose.
    Type: Grant
    Filed: July 26, 1985
    Date of Patent: May 12, 1987
    Assignee: Newpark Drilling Fluid Inc.
    Inventors: William S. Halliday, Vincent M. Thielen