Patents by Inventor Marcus A. Duffy

Marcus A. Duffy 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).

  • LIQUID CONCENTRATE OF A STRENGTH RETROGRESSION ADDITIVE
    Publication number: 20170240794
    Abstract: A liquid concentrate for use in a well that penetrates a subterranean formation comprising: a base liquid; and a strength retrogression additive, wherein the strength retrogression additive consists of particles of silicon dioxide containing crystalline regions, wherein the liquid concentrate has an activity of at least 40%.
    Type: Application
    Filed: September 23, 2014
    Publication date: August 24, 2017
    Inventors: Benjamin J. Iverson, Robert L. Browning, Marcus A. Duffy